San Diego
San Diego (; Spanish for 'Saint Didacus'; ) is a major city in California, United States. It is in San Diego County, on the coast of the Pacific Ocean in Southern California, approximately  south of Los Angeles and immediately adjacent to the border with Mexico.

With an estimated population of 1,406,630 as of July 1, 2016, San Diego is the eighth-largest city in the United States and second-largest in California. It is part of the San Diego–Tijuana conurbation, the second-largest transborder agglomeration between the US and a bordering country after Detroit–Windsor, with a population of 4,922,723 people. The city is known for its mild year-round climate, natural deep-water harbor, extensive beaches, long association with the United States Navy, and recent emergence as a healthcare and biotechnology development center.

San Diego has been called "the birthplace of California". Historically home to the Kumeyaay people, it was the first site visited by Europeans on what is now the West Coast of the United States. Upon landing in San Diego Bay in 1542, Juan Rodríguez Cabrillo claimed the area for Spain, forming the basis for the settlement of Alta California 200 years later. The Presidio and Mission San Diego de Alcalá, founded in 1769, formed the first European settlement in what is now California. In 1821, San Diego became part of the newly independent Mexico, which reformed as the First Mexican Republic two years later. California became part of the United States in 1848 following the Mexican–American War and was admitted to the union as a state in 1850.

The city is the seat of San Diego County and is the economic center of the region as well as the San Diego–Tijuana metropolitan area. San Diego's main economic engines are military and defense-related activities, tourism, international trade, and manufacturing. The presence of the University of California, San Diego (UCSD), with the affiliated UCSD Medical Center, has helped make the area a center of research in biotechnology.

History

Pre-colonial period
thumb|left|upright|alt=Full length portrait of a man in his thirties wearing a long robe, woman and child visible behind him and dog to his left|Kumeyaay people lived in San Diego before Europeans settled there.

The original inhabitants of the region are now known as the San Dieguito and La Jolla people.Gallegos, Dennis R. (editor). 1987. San Dieguito-La Jolla: Chronology and Controversy. San Diego County Archaeological Society, Research Paper No. 1.Gallegos, Dennis R. 2017. First People: A Revised Chronology for San Diego County. StorySeekers, San Diego. The area of San Diego has been inhabited by the Kumeyaay people.

Spanish period
thumb|left|alt=Man in his twenties or thirties standing transfixed in front of a cross his height, five onlookers|Namesake of the city, Didacus of Alcalá: Saint Didacus in Ecstasy Before the Cross by Murillo (Musée des Augustins)

The first European to visit the region was explorer Juan Rodríguez Cabrillo, sailing under the flag of Castile but possibly born in Portugal. Sailing his flagship San Salvador from Navidad, New Spain, Cabrillo claimed the bay for the Spanish Empire in 1542, and named the site "San Miguel". In November 1602, Sebastián Vizcaíno was sent to map the California coast. Arriving on his flagship San Diego, Vizcaíno surveyed the harbor and what are now Mission Bay and Point Loma and named the area for the Catholic Saint Didacus, a Spaniard more commonly known as San Diego de Alcalá. On November 12, 1602, the first Christian religious service of record in Alta California was conducted by Friar Antonio de la Ascensión, a member of Vizcaíno's expedition, to celebrate the feast day of San Diego.
thumb|left|Mission San Diego de Alcalá

Permanent colonization of California and of San Diego began in 1769 with the arrival of four contingents of Spaniards from New Spain and the Baja California peninsula. Two seaborne parties reached San Diego Bay: the San Carlos, under Vicente Vila and including as notable members the engineer and cartographer Miguel Costansó and the soldier and future governor Pedro Fages, and the San Antonio, under Juan Pérez. An initial overland expedition to San Diego from the south was led by the soldier Fernando Rivera and included the Franciscan missionary, explorer, and chronicler Juan Crespí, followed by a second party led by the designated governor Gaspar de Portolà and including the mission president (and now saint) Junípero Serra.Pourade, Richard F. 1960. The History of San Diego: The Explorers. Union-Tribune Publishing Company, San Diego.

In May 1769, Portolà established the Fort Presidio of San Diego on a hill near the San Diego River. It was the first settlement by Europeans in what is now the state of California. In July of the same year, Mission San Diego de Alcalá was founded by Franciscan friars under Serra. By 1797, the mission boasted the largest native population in Alta California, with over 1,400 neophytes living in and around the mission proper. Mission San Diego was the southern anchor in Alta California of the historic mission trail El Camino Real. Both the Presidio and the Mission are National Historic Landmarks.

Mexican period
In 1821, Mexico won its independence from Spain, and San Diego became part of the Mexican territory of Alta California. In 1822, Mexico began attempting to extend its authority over the coastal territory of Alta California. The fort on Presidio Hill was gradually abandoned, while the town of San Diego grew up on the level land below Presidio Hill. The Mission was secularized by the Mexican government in 1834, and most of the Mission lands were granted to former soldiers. The 432 residents of the town petitioned the governor to form a pueblo, and Juan María Osuna was elected the first alcalde ("municipal magistrate"), defeating Pío Pico in the vote. (See, List of pre-statehood mayors of San Diego.) However, San Diego had been losing population throughout the 1830s and in 1838 the town lost its pueblo status because its size dropped to an estimated 100 to 150 residents. Beyond town Mexican land grants expanded the number of California ranchos that modestly added to the local economy.

In 1846, the United States went to war against Mexico and sent a naval and land expedition to conquer Alta California. At first they had an easy time of it capturing the major ports including San Diego, but the Californios in southern Alta California struck back. Following the successful revolt in Los Angeles, the American garrison at San Diego was driven out without firing a shot in early October 1846. Mexican partisans held San Diego for three weeks until October 24, 1846, when the Americans recaptured it. For the next several months the Americans were blockaded inside the pueblo. Skirmishes occurred daily and snipers shot into the town every night. The Californios drove cattle away from the pueblo hoping to starve the Americans and their Californio supporters out. On December 1 the Americans garrison learned that the dragoons of General Stephen W. Kearney were at Warner's Ranch. Commodore Robert F. Stockton sent a mounted force of fifty under Captain Archibald Gillespie to march north to meet him. Their joint command of 150 men, returning to San Diego, encountered about 93 Californios under Andrés Pico. In the ensuing Battle of San Pasqual, fought in the San Pasqual Valley which is now part of the city of San Diego, the Americans suffered their worst losses in the campaign. Subsequently, a column led by Lieutenant Gray arrived from San Diego, rescuing Kearny's battered and blockaded command.

Stockton and Kearny went on to recover Los Angeles and force the capitulation of Alta California with the "Treaty of Cahuenga" on January 13, 1847. As a result of the Mexican–American War of 1846–48, the territory of Alta California, including San Diego, was ceded to the United States by Mexico, under the terms of the Treaty of Guadalupe Hidalgo in 1848. The Mexican negotiators of that treaty tried to retain San Diego as part of Mexico, but the Americans insisted that San Diego was "for every commercial purpose of nearly equal importance to us with that of San Francisco," and the Mexican–American border was eventually established to be one league south of the southernmost point of San Diego Bay, so as to include the entire bay within the United States.

American period
thumb|left|upright=0.7|alt=Oval, black and white shoulder-height portrait of a man in his forties or fifties, slightly balding wearing a suit|Namesake of Horton Plaza, Alonzo Horton developed "New Town" which became Downtown San Diego.
The state of California was admitted to the United States in 1850. That same year San Diego was designated the seat of the newly established San Diego County and was incorporated as a city. Joshua H. Bean, the last alcalde of San Diego, was elected the first mayor. Two years later the city was bankrupt; the California legislature revoked the city's charter and placed it under control of a board of trustees, where it remained until 1889. A city charter was reestablished in 1889, and today's city charter was adopted in 1931.

The original town of San Diego was located at the foot of Presidio Hill, in the area which is now Old Town San Diego State Historic Park. The location was not ideal, being several miles away from navigable water at its port at La Playa. In 1850, William Heath Davis promoted a new development by the bay shore called "New San Diego", several miles south of the original settlement; however, for several decades the new development consisted only of a pier, a few houses and an Army depot for the support of Fort Yuma.  After 1854, the fort became supplied by sea and by steamboats on the Colorado River and the depot fell into disuse.  From 1857 to 1860, San Diego became the western terminus of the San Antonio-San Diego Mail Line, the earliest overland stagecoach and mail operation from the Eastern United States to California, coming from Texas through New Mexico Territory in less than 30 days.Basil C. Pearce, The Jackass Mail—San Antonio and San Diego Mail Line, The Journal of San Diego History, San Diego Historical Society Quarterly, Spring 1969, Volume 15, Number 2

In the late 1860s, Alonzo Horton promoted a move to the bayside area, which he called "New Town" and which became Downtown San Diego. Horton promoted the area heavily, and people and businesses began to relocate to New Town because its location on San Diego Bay was convenient to shipping.  New Town soon eclipsed the original settlement, known to this day as Old Town, and became the economic and governmental heart of the city. Still, San Diego remained a relative backwater town until the arrival of a railroad connection in 1878.

thumb|upright=0.7|alt=Hand drawn illustration of Balboa Park|Balboa Park on the cover of a guidebook for the World Exposition of 1915
In the early part of the 20th century, San Diego hosted two World's Fairs: the Panama-California Exposition in 1915 and the California Pacific International Exposition in 1935. Both expositions were held in Balboa Park, and many of the Spanish/Baroque-style buildings that were built for those expositions remain to this day as central features of the park. The buildings were intended to be temporary structures, but most remained in continuous use until they progressively fell into disrepair. Most were eventually rebuilt, using castings of the original façades to retain the architectural style. The menagerie of exotic animals featured at the 1915 exposition provided the basis for the San Diego Zoo. During the 1950s there was a citywide festival called Fiesta del Pacifico highlighting the area's Spanish and Mexican past. In the 2010s there was a proposal for a large-scale celebration of the 100th anniversary of Balboa Park, but the plans were abandoned when the organization tasked with putting on the celebration went out of business.

The southern portion of the Point Loma peninsula was set aside for military purposes as early as 1852. Over the next several decades the Army set up a series of coastal artillery batteries and named the area Fort Rosecrans. Significant U.S. Navy presence began in 1901 with the establishment of the Navy Coaling Station in Point Loma, and expanded greatly during the 1920s.University of San Diego: Military Bases in San Diego  By 1930, the city was host to Naval Base San Diego, Naval Training Center San Diego, San Diego Naval Hospital, Camp Matthews, and Camp Kearny (now Marine Corps Air Station Miramar). The city was also an early center for aviation: as early as World War I, San Diego was proclaiming itself "The Air Capital of the West". The city was home to important airplane developers and manufacturers like Ryan Airlines (later Ryan Aeronautical), founded in 1925, and Consolidated Aircraft (later Convair), founded in 1923. Charles A. Lindbergh's plane The Spirit of St. Louis was built in San Diego in 1927 by Ryan Airlines.

During World War II, San Diego became a major hub of military and defense activity, due to the presence of so many military installations and defense manufacturers. The city's population grew rapidly during and after World War II, more than doubling between 1930 (147,995) and 1950 (333,865).Moffatt, Riley.  Population History of Western U.S. Cities & Towns, 1850–1990. Lanham: Scarecrow, 1996, 54. During the final months of the war, the Japanese had a plan to target multiple U.S. cities for biological attack, starting with San Diego. The plan was called "Operation Cherry Blossoms at Night" and called for kamikaze planes filled with fleas infected with plague (Yersinia pestis) to crash into civilian population centers in the city, hoping to spread plague in the city and effectively kill tens of thousands of civilians. The plan was scheduled to launch on September 22, 1945, but was not carried out because Japan surrendered five weeks earlier.Naomi Baumslag, Murderous Medicine: Nazi Doctors, Human Experimentation, and Typhus, 2005, p.207

After World War II, the military continued to play a major role in the local economy, but post-Cold War cutbacks took a heavy toll on the local defense and aerospace industries. The resulting downturn led San Diego leaders to seek to diversify the city's economy by focusing on research and science, as well as tourism.

From the start of the 20th century through the 1970s, the American tuna fishing fleet and tuna canning industry were based in San Diego, "the tuna capital of the world". San Diego's first tuna cannery was founded in 1911, and by the mid-1930s the canneries employed more than 1,000 people. A large fishing fleet supported the canneries, mostly staffed by immigrant fishermen from Japan, and later from the Portuguese Azores and Italy whose influence is still felt in neighborhoods like Little Italy and Point Loma. Due to rising costs and foreign competition, the last of the canneries closed in the early 1980s.

Downtown San Diego was in decline in the 1960s and 1970s, but experienced some urban renewal since the early 1980s, including the opening of Horton Plaza, the revival of the Gaslamp Quarter, and the construction of the San Diego Convention Center; Petco Park opened in 2004.

Geography

thumb|left|Urban aerial of San Diego and Tijuana, Mexico
According to SDSU professor emeritus Monte Marshall, San Diego Bay is "the surface expression of a north-south-trending, nested graben". The Rose Canyon and Point Loma fault zones are part of the San Andreas Fault system. About  east of the bay are the Laguna Mountains in the Peninsular Ranges, which are part of the backbone of the American continents.

The city lies on approximately 200 deep canyons and hills separating its mesas, creating small pockets of natural open space scattered throughout the city and giving it a hilly geography. Traditionally, San Diegans have built their homes and businesses on the mesas, while leaving the urban canyons relatively wild. Thus, the canyons give parts of the city a segmented feel, creating gaps between otherwise proximate neighborhoods and contributing to a low-density, car-centered environment. The San Diego River runs through the middle of San Diego from east to west, creating a river valley which serves to divide the city into northern and southern segments. During the historic period and presumably earlier as well, the river has shifted its flow back and forth between San Diego Bay and Mission Bay, and its fresh water was the focus of the earliest Spanish explorers. Miguel Costansó, a cartographer, wrote in 1769, "When asked by signs where the watering-place was, the Indians pointed to a grove which could be seen at a considerable distance to the northeast, giving to understand that a river or creek flowed through it, and that they would lead our men to it if they would follow.""EXPEDITIONS BY SEA." THE EXPLORERS. Trans. Richard F. Pourade. La Jolla: Copley, 1960. 64-72. Print.Janet R. Fireman and Manuel P. Servín, "Miguel Costansó: California's Forgotten Founder." California Historical Society Quarterly, vol. 49, no. 1, March 1970, pp. 3–19. That river was the San Diego River. Several reservoirs and Mission Trails Regional Park also lie between and separate developed areas of the city.
thumb|right|Mission Valley facing Northwest, taken from Arista Street. Mission Bay can be seen in the distance.
Notable peaks within the city limits include Cowles Mountain, the highest point in the city at ; Black Mountain at ; and Mount Soledad at . The Cuyamaca Mountains and Laguna Mountains rise to the east of the city, and beyond the mountains are desert areas. The Cleveland National Forest is a half-hour drive from downtown San Diego. Numerous farms are found in the valleys northeast and southeast of the city.

In its 2013 ParkScore ranking, The Trust for Public Land  reported that San Diego had the 9th-best park system among the 50 most populous U.S. cities."Report: San Diego has 9th best parks among survey of 50 U.S. cities"  June 6, 2013. ABC 10 News. Retrieved on July 18, 2013. ParkScore ranks city park systems by a formula that analyzes acreage, access, and service and investment.

Communities and neighborhoods

thumb|right|Normal Heights, a neighborhood of San Diego

The City of San Diego recognizes 52 individual areas as Community Planning Areas. Within a given planning area there may be several distinct neighborhoods. Altogether the city contains more than 100 identified neighborhoods.

Downtown San Diego is located on San Diego Bay. Balboa Park encompasses several mesas and canyons to the northeast, surrounded by older, dense urban communities including Hillcrest and North Park. To the east and southeast lie City Heights, the College Area, and Southeast San Diego. To the north lies Mission Valley and Interstate 8. The communities north of the valley and freeway, and south of Marine Corps Air Station Miramar, include Clairemont, Kearny Mesa, Tierrasanta, and Navajo. Stretching north from Miramar are the northern suburbs of Mira Mesa, Scripps Ranch, Rancho Peñasquitos, and Rancho Bernardo. The far northeast portion of the city encompasses Lake Hodges and the San Pasqual Valley, which holds an agricultural preserve. Carmel Valley and Del Mar Heights occupy the northwest corner of the city. To their south are Torrey Pines State Reserve and the business center of the Golden Triangle. Further south are the beach and coastal communities of La Jolla, Pacific Beach, Mission Beach, and Ocean Beach. Point Loma occupies the peninsula across San Diego Bay from downtown. The communities of South San Diego, such as San Ysidro and Otay Mesa, are located next to the Mexico–United States border, and are physically separated from the rest of the city by the cities of National City and Chula Vista. A narrow strip of land at the bottom of San Diego Bay connects these southern neighborhoods with the rest of the city.

For the most part, San Diego neighborhood boundaries tend to be understood by its residents based on geographical boundaries like canyons and street patterns. The city recognized the importance of its neighborhoods when it organized its 2008 General Plan around the concept of a "City of Villages".

Cityscape

San Diego was originally centered on the Old Town district, but by the late 1860s the focus had shifted to the bayfront, in the belief that this new location would increase trade. As the "New Town" – present-day Downtown – waterfront location quickly developed, it eclipsed Old Town as the center of San Diego.

The development of skyscrapers over  in San Diego is attributed to the construction of the El Cortez Hotel in 1927, the tallest building in the city from 1927 to 1963. As time went on, multiple buildings claimed the title of San Diego's tallest skyscraper, including the Union Bank of California Building and Symphony Towers. Currently the tallest building in San Diego is One America Plaza, standing  tall, which was completed in 1991. The downtown skyline contains no super-talls, as a regulation put in place by the Federal Aviation Administration in the 1970s set a  limit on the height of buildings within a  radius of the San Diego International Airport. An iconic description of the skyline includes its skyscrapers being compared to the tools of a toolbox.

Climate

thumb|left|Palms at Pacific Beach
San Diego has one of the top-ten best climates according to the Farmers' Almanac and has one of the two best summer climates in America as scored by The Weather Channel. Under the Köppen–Geiger climate classification system, the San Diego area has been variously categorized as having either a semi-arid climate (BSh in the original classification and BSn in modified Köppen classification)Atlas of the Biodiversity of California. California Department of Fish and Game . p.15. or a Mediterranean climateFrancisco Pugnaire and Fernando Valladares eds. Functional Plant Ecology. 2d ed. 2007. p.287. (Csa and Csb).Michael Allaby, Martyn Bramwell, Jamie Stokes, eds. Weather and Climate: An Illustrated Guide to Science. 2006. p.182. San Diego's climate is characterized by warm, dry summers and mild winters, with most of the annual precipitation falling between December and March. The city has a mild climate year-round,Michalski, Greg et al. First Measurements and Modeling of ∆17O in atmospheric nitrate . Geophysical Research Letters, Vol. 30, No. 16. p.3. 2003. with an average of 201 days above  and low rainfall ( annually).

The climate in San Diego, like most of Southern California, often varies significantly over short geographical distances, resulting in microclimates. In San Diego, this is mostly because of the city's topography (the Bay, and the numerous hills, mountains, and canyons). Frequently, particularly during the "May gray/June gloom" period, a thick "marine layer" cloud cover keeps the air cool and damp within a few miles of the coast, but yields to bright cloudless sunshine approximately  inland. Sometimes the June gloom lasts into July, causing cloudy skies over most of San Diego for the entire day. Even in the absence of June gloom, inland areas experience much more significant temperature variations than coastal areas, where the ocean serves as a moderating influence. Thus, for example, downtown San Diego averages January lows of  and August highs of . The city of El Cajon, just  inland from downtown San Diego, averages January lows of  and August highs of .

A sign of global warming, the average surface temperature of the water at Scripps Pier in the California Current has increased by almost 3 degrees since 1950, according to scientists at Scripps Institution of Oceanography.

thumb|upright= 0.8|Surfers at Pacific Beach
Annual rainfall along the coast averages  and the median is . The months of December through March supply most of the rain, with February the only month averaging  or more. The months of May through September tend to be almost completely dry. Although there are few wet days per month during the rainy period, rainfall can be heavy when it does fall. Rainfall is usually greater in the higher elevations of San Diego; some of the higher areas can receive  per year. Variability from year to year can be dramatic: in the wettest years of 1883/1884 and 1940/1941 more than  fell, whilst in the driest years there was as little as . The wettest month on record is December 1921 with .

Snow in the city is so rare that it has been observed only five times in the century-and-a-half that records have been kept. In 1949 and 1967, snow stayed on the ground for a few hours in higher locations like Point Loma and La Jolla. The other three occasions, in 1882, 1946, and 1987, involved flurries but no accumulation.

Ecology
thumb|left|alt=Torrey Pines State Park Valley|Coastal canyon in Torrey Pines State Reserve
Like much of southern California, the majority of San Diego's current area was originally occupied on the west by coastal sage scrub and on the east by chaparral, plant communities made up mostly of drought-resistant shrubs.Pryde, Philip R. 2014. "The Nature of the County: San Diego's Climate, Vegetation, and Wildlife". In: San Diego: An Introduction to the Region, by Philip R. Pryde, pp. 29-45. 5th ed. Sunbelt Publications, San Diego. The steep and varied topography and proximity to the ocean create a number of different habitats within the city limits, including tidal marsh and canyons. The chaparral and coastal sage scrub habitats in low elevations along the coast are prone to wildfire, and the rates of fire increased in the 20th century, due primarily to fires starting near the borders of urban and wild areas.

San Diego's broad city limits encompass a number of large nature preserves, including Torrey Pines State Reserve, Los Peñasquitos Canyon Preserve, and Mission Trails Regional Park. Torrey Pines State Reserve and a coastal strip continuing to the north constitute one of only two locations where the rare species of Torrey Pine, Pinus torreyana, is found. thumb|right|alt=San Diego against Witch Creek Fire smoke|San Diego viewed against the Witch Creek Fire smoke Due to the steep topography that prevents or discourages building, along with some efforts for preservation, there are also a large number of canyons within the city limits that serve as nature preserves, including Switzer Canyon, Tecolote Canyon Natural Park, and Marian Bear Memorial Park in San Clemente Canyon, as well as a number of small parks and preserves.

San Diego County has one of the highest counts of animal and plant species that appear on the endangered list of counties in the United States. Because of its diversity of habitat and its position on the Pacific Flyway, San Diego County has recorded 492 different bird species, more than any other region in the country. San Diego always scores high in the number of bird species observed in the annual Christmas Bird Count, sponsored by the Audubon Society, and it is known as one of the "birdiest" areas in the United States.

San Diego and its backcountry suffer from periodic wildfires. In October 2003, San Diego was the site of the Cedar Fire, called the largest wildfire in California over the past century. The fire burned , killed 15 people, and destroyed more than 2,200 homes. In addition to damage caused by the fire, smoke resulted in a significant increase in emergency room visits due to asthma, respiratory problems, eye irritation, and smoke inhalation; the poor air quality caused San Diego County schools to close for a week. Wildfires four years later destroyed some areas, particularly within Rancho Bernardo, as well as the nearby communities of Rancho Santa Fe and Ramona.

Demographics

 Racial composition   2010  1990  1970  1940 White  58.9%  67.1%  88.9%  96.9% —Non-Hispanic  45.1%   58.7%   78.9%From 15% sample  n/a Black or African American  6.7%  9.4%   7.6%  2.0% Hispanic or Latino (of any race)  28.8%  20.7%  10.7%  n/a Asian  15.9%  11.8%  2.2%  1.0%
thumb|Map of racial distribution in San Diego, 2010 U.S. Census. Each dot is 25 people: White, Black, Asian Hispanic, or Other (yellow)

The city had a population of 1,307,402 according to the 2010 census, distributed over a land area of . The urban area of San Diego extends beyond the administrative city limits and had a total population of 2,956,746, making it the third-largest urban area in the state, after that of the Los Angeles metropolitan area and San Francisco metropolitan area. They, along with the Riverside–San Bernardino, form those metropolitan areas in California larger than the San Diego metropolitan area, which had a total population of 3,095,313 at the 2010 census.

The 2010 population represents an increase of just under 7% from the 1,223,400 people, 450,691 households, and 271,315 families reported in 2000. The estimated city population in 2009 was 1,306,300. The population density was . The racial makeup of San Diego was 58.9% White, 6.7% African American, 0.6% Native American, 15.9% Asian (5.9% Filipino, 2.7% Chinese, 2.5% Vietnamese, 1.3% Indian, 1.0% Korean, 0.7% Japanese, 0.4% Laotian, 0.3% Cambodian, 0.1% Thai). 0.5% Pacific Islander (0.2% Guamanian, 0.1% Samoan, 0.1% Native Hawaiian), 12.3% from other races, and 5.1% from two or more races. The ethnic makeup of the city was 28.8% Hispanic or Latino (of any race); 24.9% of the total population were Mexican American, and 0.6% were Puerto Rican. Median age of Hispanics was 27.5 years, compared to 35.1 years overall and 41.6 years among non-Hispanic whites; Hispanics were the largest group in all ages under 18, and non-Hispanic whites constituted 63.1% of population 55 and older.

thumb|left|A U.S. Navy vice admiral and an intelligence specialist celebrating Hispanic American Heritage Month in San Diego

, San Diego has the third-largest homeless population in the United States; the city's homeless population has the largest percentage of homeless veterans in the nation. The population of homeless veterans in San Diego has been reduced to 1,150 people in 2016, from 2,100 in 2009.

In 2000 there were 451,126 households, out of which 30.2% had children under the age of 18 living with them, 44.6% were married couples living together, 11.4% had a female householder with no husband present, and 39.8% were non-families. Households made up of individuals account for 28.0%, and 7.4% had someone living alone who was 65 years of age or older. The average household size was 2.61, and the average family size was 3.30.

The U.S. Census Bureau reported that in 2000, 24.0% of San Diego residents were under 18, and 10.5% were 65 and over.  the median age was 35.6; more than a quarter of residents were under age 20 and 11% were over age 65. Millennials (ages 18 through 34) constitute 27.1% of San Diego's population, the second-highest percentage in a major U.S. city. The San Diego County regional planning agency, SANDAG, provides tables and graphs breaking down the city population into five-year age groups.

In 2000, the median income for a household in the city was $45,733, and the median income for a family was $53,060. Males had a median income of $36,984 versus $31,076 for females. The per capita income for the city was $35,199. According to Forbes in 2005, San Diego was the fifth wealthiest U.S. city but about 10.6% of families and 14.6% of the population were below the poverty line, including 20.0% of those under age 18 and 7.6% of those age 65 or over. San Diego was rated the fifth-best place to live in the United States in 2006 by Money magazine, although it was no longer rated in the top 100 places by 2017. As of January 1, 2008 estimates by the San Diego Association of Governments revealed that the household median income for San Diego rose to $66,715, up from $45,733 in 2000.

San Diego was named the ninth-most LGBT-friendly city in the U.S. in 2013. The city also has the seventh-highest percentage of gay residents in the U.S. Additionally in 2013, San Diego State University (SDSU), one of the city's prominent universities, was named one of the top LGBT-friendly campuses in the nation.

According to a 2014 study by the Pew Research Center, 68% of the population of the city identified themselves as Christians, with 22% professing attendance at a variety of churches that could be considered Protestant, and 32% professing Roman Catholic beliefs.Major U.S. metropolitan areas differ in their religious profiles, Pew Research Center while 27% claim no religious affiliation. The same study says that other religions (including Judaism, Buddhism, Islam, and Hinduism) collectively make up about 5% of the population.

Economy

The largest sectors of San Diego's economy are defense/military, tourism, international trade, and research/manufacturing. In 2014, San Diego was designated by a Forbes columnist as the best city in the country to launch a small business or startup company.

Defense and military
thumb|right|F/A-18 Hornet flying over San Diego and the USS John C. Stennis
The economy of San Diego is influenced by its deepwater port, which includes the only major submarine and shipbuilding yards on the West Coast. Several major national defense contractors were started and are headquartered in San Diego, including General Atomics, Cubic, and NASSCO.

San Diego hosts the largest naval fleet in the world: In 2008 it was home to 53 ships, over 120 tenant commands, and more than 35,000 sailors, soldiers, Department of Defense civilian employees and contractors. About 5 percent of all civilian jobs in the county are military-related, and 15,000 businesses in San Diego County rely on Department of Defense contracts.

Military bases in San Diego include US Navy facilities, Marine Corps bases, and Coast Guard stations.
The city is "home to the majority of the U.S. Pacific Fleet's surface combatants, all of the Navy's West Coast amphibious ships and a variety of Coast Guard and Military Sealift Command vessels".

Tourism
thumb|View on the Harbor Drive

Tourism is a major industry owing to the city's climate, beaches, and tourist attractions such as Balboa Park, Belmont amusement park, San Diego Zoo, San Diego Zoo Safari Park, and SeaWorld San Diego. San Diego's Spanish and Mexican heritage is reflected in many historic sites across the city, such as Mission San Diego de Alcala and Old Town San Diego State Historic Park.  Also, the local craft brewing industry attracts an increasing number of visitors for "beer tours" and the annual San Diego Beer Week in November; San Diego has been called "America's Craft Beer Capital."

San Diego County hosted more than 32 million visitors in 2012; collectively they spent an estimated $8 billion. The visitor industry provides employment for more than 160,000 people.

San Diego's cruise ship industry used to be the second-largest in California. Numerous cruise lines operate out of San Diego. However, cruise ship business has been in decline since 2008, when the Port hosted over 250 ship calls and more than 900,000 passengers. By 2016-2017 the number of ship calls had fallen to 90.

Local sight-seeing cruises are offered in San Diego Bay and Mission Bay, as well as whale-watching cruises to observe the migration of gray whales, peaking in mid-January. Sport fishing is another popular tourist attraction; San Diego is home to southern California's biggest sport fishing fleet.

International trade
San Diego's commercial port and its location on the United States–Mexico border make international trade an important factor in the city's economy. The city is authorized by the United States government to operate as a Foreign Trade Zone.

The city shares a  border with Mexico that includes two border crossings. San Diego hosts the busiest international border crossing in the world, in the San Ysidro neighborhood at the San Ysidro Port of Entry. A second, primarily commercial border crossing operates in the Otay Mesa area; it is the largest commercial crossing on the California-Baja California border and handles the third-highest volume of trucks and dollar value of trade among all United States-Mexico land crossings.

One of the Port of San Diego's two cargo facilities is located in Downtown San Diego at the Tenth Avenue Marine Terminal. This terminal has facilities for containers, bulk cargo, and refrigerated and frozen storage, so that it can handle the import and export of many commodities. In 2009 the Port of San Diego handled 1,137,054 short tons of total trade; foreign trade accounted for 956,637 short tons while domestic trade amounted to 180,417 short tons.

Historically tuna fishing and canning was one of San Diego's major industries, and although the American tuna fishing fleet is no longer based in San Diego, seafood companies Bumble Bee Foods and Chicken of the Sea are still headquartered there.

Companies
thumb|alt=Modern five-story office building|Qualcomm corporate headquarters

San Diego hosts several major producers of wireless cellular technology. Qualcomm was founded and is headquartered in San Diego, and is one of the largest private-sector  employers in San Diego. Other wireless industry manufacturers headquartered here include Nokia, LG Electronics, Kyocera International, Cricket Communications and Novatel Wireless.  The largest software company in San Diego is security software company Websense Inc. San Diego also has the U.S. headquarters for the Slovakian security company ESET. San Diego has been designated as an iHub Innovation Center for potential collaboration between wireless and the life sciences.

The University of California, San Diego and other research institutions have helped to fuel the growth of biotechnology. In 2013, San Diego had the second-largest biotech cluster in the United States, below the Boston area and above the San Francisco Bay Area. There are more than 400 biotechnology companies in the area. In particular, the La Jolla and nearby Sorrento Valley areas are home to offices and research facilities for numerous biotechnology companies. Major biotechnology companies like Illumina and Neurocrine Biosciences are headquartered in San Diego, while many other biotech and pharmaceutical companies have offices or research facilities in San Diego.  San Diego is also home to more than 140 contract research organizations (CROs) that provide contract services for pharmaceutical and biotechnology companies.Bigelow, Bruce V. "San Diego's Life Sciences CROs—The Map of Clinical Research Organizations", "Xconomy", San Diego, January 27, 2010.

Top employers

According to the City's 2016 Comprehensive Annual Financial Report,City of San Diego, California Comprehensive Annual Financial Report, Year ended June 30, 2016, page 325 the top employers in the city are:
 Employer EmployeesUnited States Navy38,455University of California, San Diego29,986Sharp HealthCare17,807County of San Diego17,384San Diego Unified School District14,120Qualcomm, Inc.11,600City of San Diego11,387Scripps Health10,853Kaiser Permanente8,385San Diego Community College District5,580

Real estate
450px|thumb|Skyline view of the Village of La Jolla in San Diego
San Diego has high real estate prices.  As of May 2015, the median price of a house was $520,000. However, since February 2016, the median home price has dropped to $455,000. The San Diego metropolitan area had one of the worst housing affordability rankings of all metropolitan areas in the United States.

Consequently, San Diego has experienced negative net migration since 2004. A significant number of people moved to adjacent Riverside County, commuting daily to jobs in San Diego, while others are leaving the region altogether and moving to more affordable regions.

San Diego home prices peaked in 2005, and then declined along with the national trend. As of December 2010, prices were down 36 percent from the peak. The median home price declined by more than $200,000 between 2005 and 2010.

Culture
thumb|upright= 0.8|The Museum of Man

Many popular museums, such as the San Diego Museum of Art, the San Diego Natural History Museum, the San Diego Museum of Man, the Museum of Photographic Arts, and the San Diego Air & Space Museum, are located in Balboa Park, which is also the location of the San Diego Zoo. The Museum of Contemporary Art San Diego (MCASD) is located in La Jolla and has a branch located at the Santa Fe Depot downtown. The downtown branch consists of two buildings on two opposite streets. The Columbia district downtown is home to historic ship exhibits belonging to the San Diego Maritime Museum, headlined by the Star of India, as well as the unrelated San Diego Aircraft Carrier Museum featuring the USS Midway aircraft carrier.

The San Diego Symphony at Symphony Towers performs on a regular basis; from 2004 to 2017 its director was Jahja Ling. The San Diego Opera at Civic Center Plaza, now directed by David Bennett, was ranked by Opera America as one of the top 10 opera companies in the United States. Old Globe Theatre at Balboa Park produces about 15 plays and musicals annually. The La Jolla Playhouse at UCSD is directed by Christopher Ashley. Both the Old Globe Theatre and the La Jolla Playhouse have produced the world premieres of plays and musicals that have gone on to win Tony Awards or nominations on Broadway. The Joan B. Kroc Theatre at Kroc Center's Performing Arts Center is a 600-seat state-of-the-art theatre that hosts music, dance, and theatre performances. The San Diego Repertory Theatre at the Lyceum Theatres in Westfield Horton Plaza produces a variety of plays and musicals. Hundreds of movies and a dozen TV shows have been filmed in San Diego, a tradition going back as far as 1898.

Sports

Major League teams
 Club Sport Since League Venue (capacity) Attendance  San Diego Padres Baseball 1969 Major League Baseball Petco Park (41,200) 27,103

Minor League teams
 Club Sport Since League Venue (capacity) Attendance San Diego Gulls Ice hockey 2015 American Hockey LeagueValley View Casino Center (12,920) 8,541 San Diego Seals Box lacrosse 2017 National Lacrosse League San Diego 1904 FC Soccer 2017 under negotiationTorero Stadium (6,000) San Diego Legion Rugby union 2018 Major League Rugby

College teams
 Team Sport League Venue (capacity) Attendance San Diego State Aztecs Football NCAA D-I (Mtn West) SDCCU Stadium (54,000) 49,053 San Diego State Aztecs Basketball NCAA D-I (Mtn West) Viejas Arena (12,414) 12,414 San Diego Toreros Basketball NCAA D-I (West Coast) Jenny Craig Pavilion (5,100) 5,100 San Diego State Aztecs Soccer NCAA D-I (Mtn West) SDSU Sports Deck (1,000) 811

thumb|right|alt=Full stands, both teams on the field, cheerleaders and lots of people milling around|Qualcomm Stadium hosts a Chargers game against the St. Louis Rams.

San Diego is home to one major professional team—Major League Baseball's San Diego Padres, who play at Petco Park.

From 1961 to the 2016 season, the team hosted a National Football League franchise, the San Diego Chargers. In 2017, they moved back to Los Angeles and became the Los Angeles Chargers.

In two separate stints, the National Basketball Association had a franchise in San Diego, the San Diego Rockets from 1967 to 1971 and the San Diego Clippers from 1978 to 1984. The franchises moved to Houston and Los Angeles respectively.

From 1972 to 1975, San Diego was home to an American Basketball Association team. First named the Conquistadors ( "The Q's") the name was changed to the San Diego Sails for the 1975–76 season, but the team folded before completing that campaign.

In 2017 the San Diego 1904 FC club was organized as a proposed American professional Division II soccer team. The club's founders include several major-league soccer players. They intend to build a soccer stadium in Oceanside, approximately 40 miles north of downtown San Diego, and will play at the University of San Diego's Torero Stadium in the meantime. The team was originally announced to make its debut in the North American Soccer League in 2018. However, due to the cancellation of the 2018 NASL season, the expansion team is negotiating an agreement to join the United Soccer League in 2019.

San Diego hosts three NCAA universities: San Diego State University; University of California, San Diego; and University of San Diego. NCAA Division I San Diego State Aztecs men's and women's basketball games are played at Viejas Arena. Other prominent Aztec sports include college football, as well as soccer, basketball and volleyball. The San Diego State Aztecs (MWC) and the San Diego Toreros (WCC) are NCAA Division I teams. The UCSD Tritons are members of NCAA Division II.

San Diego has hosted several sports events. Three NFL Super Bowl championships have been held at San Diego County Credit Union (SDCCU) Stadium. Two of college football's annual bowl games are also held at SDCCU Stadium: the Holiday Bowl and the Poinsettia Bowl. Parts of the World Baseball Classic were played at Petco Park in 2006 and 2009.

thumb|left|Petco Park in 2006
SDCCU Stadium also hosts international soccer games and supercross events.  Soccer, American football, and track and field are also played in Balboa Stadium, the city's first stadium, constructed in 1914.

Rugby union is a developing sport in the city. The San Diego Breakers played at Torero Stadium in the only PRO Rugby season before the league folded. The USA Sevens, a major international rugby event, was held there from 2007 through 2009. San Diego is represented by Old Mission Beach Athletic Club RFC, the former home club of USA Rugby's former Captain Todd Clever. San Diego participated in the Western American National Rugby League between 2011 and 2013.

The San Diego Surf of the American Basketball Association is located in the city. The annual Farmers Insurance Open golf tournament (formerly the Buick Invitational) on the PGA Tour occurs at Torrey Pines Golf Course. This course was also the site of the 2008 U.S. Open Golf Championship. The San Diego Yacht Club hosted the America's Cup yacht races three times during the period 1988 to 1995. The amateur beach sport Over-the-line was invented in San Diego, and the annual world Over-the-line championships are held at Mission Bay every year.

Government

Local government

thumb|left|upright|Mayor Kevin Faulconer
The city is governed by a mayor and a nine-member city council. In 2006, its government changed from a council–manager government to a strong mayor government, as decided by a citywide vote in 2004. The mayor is in effect the chief executive officer of the city, while the council is the legislative body. The City of San Diego is responsible for police, public safety, streets, water and sewer service, planning and zoning, and similar services within its borders. San Diego is a sanctuary city, however, San Diego County is a participant of the Secure Communities program. , the city had one employee for every 137 residents, with a payroll greater than $733 million.

thumb|right|alt=Wood paneling floor to ceiling with seats for 8 members and support staff|San Diego City Council chambers
The members of the city council are each elected from single-member districts within the city. The mayor and city attorney are elected directly by the voters of the entire city. The mayor, city attorney, and council members are elected to four-year terms, with a two-term limit. Elections are held on a non-partisan basis per California state law; nevertheless, most officeholders do identify themselves as either Democrats or Republicans. In 2007, registered Democrats outnumbered Republicans by about 7 to 6 in the city, and Democrats currently () hold a 5–4 majority in the city council. The current mayor, Kevin Faulconer, is a Republican.

San Diego is part of San Diego County, and includes all or part of the 1st, 2nd, 3rd and 4th supervisorial districts of the San Diego County Board of Supervisors, Other county officers elected in part by city residents include the Sheriff, District Attorney, Assessor/Recorder/County Clerk, and Treasurer/Tax Collector.

Areas of the city immediately adjacent to San Diego Bay ("tidelands") are administered by the Port of San Diego, a quasi-governmental agency which owns all the property in the tidelands and is responsible for its land use planning, policing, and similar functions. San Diego is a member of the regional planning agency San Diego Association of Governments (SANDAG). Public schools within the city are managed and funded by independent school districts (see below).

State and federal representation
In the California State Senate, San Diego County encompasses the 38th, 39th and 40th districts, represented by , , and , respectively.

In the California State Assembly, lying partially within the city of San Diego are the 77th, 78th, 79th, and 80th districts, represented by , , , and , respectively.

In the United States House of Representatives, San Diego County includes parts or all of California's 49th, 50th, 51st, 52nd, and 53rd congressional districts, represented by , , , , and , respectively.

Major scandals
San Diego was the site of the 1912 San Diego free speech fight, in which the city restricted speech, vigilantes brutalized and tortured anarchists, and the San Diego Police Department killed a member of the Industrial Workers of the World (IWW).

In 1916, rainmaker Charles Hatfield was blamed for $4 million in damages and accused of causing San Diego's worst flood, during which about 20 Japanese American farmers died.

Then-mayor Roger Hedgecock was forced to resign his post in 1985, after he was found guilty of one count of conspiracy and 12 counts of perjury, related to the alleged failure to report all campaign contributions. After a series of appeals, the 12 perjury counts were dismissed in 1990 based on claims of juror misconduct; the remaining conspiracy count was reduced to a misdemeanor and then dismissed.

A 2002 scheme to underfund pensions for city employees led to the San Diego pension scandal. This resulted in the resignation of newly re-elected Mayor Dick Murphy and the criminal indictment of six pension board members.Strumpf, Daniel (June 15, 2005) San Diego's Pension Scandal for Dummies, San Diego City Beat via Internet Archive. Retrieved April 3, 2011. Those charges were finally dismissed by a federal judge in 2010.

On November 28, 2005, U.S. Congressman Randy "Duke" Cunningham resigned after being convicted on federal bribery charges. He had represented California's 50th congressional district, which includes much of the northern portion of the city of San Diego. In 2006, Cunningham was sentenced to a 100-month prison sentence. He was released in 2013.

In 2005 two city council members, Ralph Inzunza and Deputy Mayor Michael Zucchet – who briefly took over as acting mayor when Murphy resigned – were convicted of extortion, wire fraud, and conspiracy to commit wire fraud for taking campaign contributions from a strip club owner and his associates, allegedly in exchange for trying to repeal the city's "no touch" laws at strip clubs. Both subsequently resigned. Inzunza was sentenced to 21 months in prison. In 2009, a judge acquitted Zucchet on seven out of the nine counts against him, and granted his petition for a new trial on the other two charges; the remaining charges were eventually dropped.

In July 2013, three former supporters of mayor Bob Filner asked him to resign because of allegations of repeated sexual harassment.Filner apologizes, gets professional help, San Diego Union Tribune, July 11, 2013 Over the ensuing six weeks, 18 women came forward to publicly claim that Filner had sexually harassed them, and multiple individuals and groups called for him to resign. Filner agreed to resign effective August 30, 2013, subsequently pleaded guilty to one felony count of false imprisonment and two misdemeanor battery charges, and was sentenced to house arrest and probation.

Crime
thumb|right|San Diego Police Department car in the city center
San Diego was ranked as the 20th-safest city in America in 2013 by Business Insider.Safe Cities In America. Business Insider (July 25, 2013). Retrieved on September 6, 2013. According to Forbes magazine, San Diego was the ninth-safest city in the top 10 list of safest cities in the U.S. in 2010. Like most major cities, San Diego had a declining crime rate from 1990 to 2000. Crime in San Diego increased in the early 2000s. In 2004, San Diego had the sixth lowest crime rate of any U.S. city with over half a million residents. From 2002 to 2006, the crime rate overall dropped 0.8%, though not evenly by category. While violent crime decreased 12.4% during this period, property crime increased 1.1%. Total property crimes per 100,000 people were lower than the national average in 2008.

According to Uniform Crime Report statistics compiled by the Federal Bureau of Investigation (FBI) in 2010, there were 5,616 violent crimes and 30,753 property crimes. Of these, the violent crimes consisted of forcible rapes, 73 robberies and 170 aggravated assaults, while 6,387 burglaries, 17,977 larceny-thefts, 6,389 motor vehicle thefts and 155 acts of arson defined the property offenses. In 2013, San Diego had the lowest murder rate of the ten largest cities in the United States.

Education

Public schools in San Diego are operated by independent school districts. The majority of the public schools in the city are served by the San Diego Unified School District, the second-largest school district in California, which includes 11 K-8 schools, 107 elementary schools, 24 middle schools, 13 atypical and alternative schools, 28 high schools, and 45 charter schools.

thumb|upright= 0.7|San Diego State University's Hepner HallSeveral adjacent school districts which are headquartered outside the city limits serve some schools within the city; these include the Poway Unified School District, Del Mar Union School District, San Dieguito Union High School District and Sweetwater Union High School District. In addition, there are a number of private schools in the city.

Colleges and universities
According to education rankings released by the U.S. Census Bureau in 2006, 40.4 percent of San Diegans ages 25 and older hold bachelor's degrees. The census ranks the city as the ninth-most educated city in the United States based on these figures.

Public colleges and universities in the city include San Diego State University (SDSU), University of California, San Diego (UCSD), and the San Diego Community College District, which includes San Diego City College, San Diego Mesa College, and San Diego Miramar College.

Private colleges and universities in the city include University of San Diego (USD), Point Loma Nazarene University (PLNU), Alliant International University (AIU), National University, California International Business University (CIBU), San Diego Christian College, John Paul the Great Catholic University, California College San Diego, Coleman University, University of Redlands School of Business, Design Institute of San Diego (DISD), Fashion Institute of Design & Merchandising's San Diego campus, NewSchool of Architecture and Design, Pacific Oaks College San Diego Campus, Chapman University's San Diego Campus, The Art Institute of California – San Diego, Platt College, Southern States University (SSU), UEI College, and Woodbury University School of Architecture's satellite campus.

There is one medical school in the city, the UCSD School of Medicine. There are three ABA accredited law schools in the city, which include California Western School of Law, Thomas Jefferson School of Law, and University of San Diego School of Law. There is also one law school, Western Sierra Law School, not accredited by the ABA.

Libraries
thumb|University of California, San Diego's Geisel Library, named for Theodor Seuss Geisel ("Dr. Seuss")
The city-run San Diego Public Library system is headquartered downtown and has 36 branches throughout the city.  The newest location is in Skyline Hills, which broke ground in 2015. The libraries have had reduced operating hours since 2003 due to the city's financial problems. In 2006 the city increased spending on libraries by $2.1 million. A new nine-story Central Library on Park Boulevard at J Street opened on September 30, 2013."New main library is a creation in concrete", San Diego Union-Tribune, November 16, 2011

In addition to the municipal public library system, there are nearly two dozen libraries open to the public run by other governmental agencies, and by schools, colleges, and universities. Noteworthy are the Malcolm A. Love Library at San Diego State University, and the Geisel Library at the University of California, San Diego.

Media

Published within the city are the daily newspaper, The San Diego Union Tribune and its online portal of the same name, and the alternative newsweeklies, the San Diego CityBeat and San Diego Reader. Times of San Diego  is a free online newspaper covering  news in the metropolitan area. Voice of San Diego is a non-profit online news outlet covering government, politics, education, neighborhoods, and the arts. The San Diego Daily Transcript is a business-oriented online newspaper.

San Diego led U.S. local markets with 69.6 percent broadband penetration in 2004 according to Nielsen//NetRatings.

San Diego's first television station was KFMB, which began broadcasting on May 16, 1949. Since the Federal Communications Commission (FCC) licensed seven television stations in Los Angeles, two VHF channels were available for San Diego because of its relative proximity to the larger city. In 1952, however, the FCC began licensing UHF channels, making it possible for cities such as San Diego to acquire more stations. Stations based in Mexico (with ITU prefixes of XE and XH) also serve the San Diego market. Television stations today include XHTJB 3 (Once TV), XETV 6 (Canal 5), KFMB 8 (CBS, with CW on DT2), KGTV 10 (ABC), XEWT 12 (Televisa Regional), KPBS 15 (PBS), KBNT-CD 17 (Univision), XHTIT-TDT 21 (Azteca 7), XHJK-TDT 27 (Azteca 13), XHAS 33 (Telemundo), K35DG-D 35 (UCSD-TV), KDTF-LD 51 (Telefutura), KNSD 39 (NBC), KZSD-LP 41 (Azteca America), KSEX-CD 42 (Infomercials), XHBJ-TDT 45 (Gala TV), XHDTV 49 (MNTV), KUSI 51 (Independent), XHUAA-TDT 57  (Canal de las Estrellas), and KSWB-TV 69 (Fox). San Diego has an 80.6 percent cable penetration rate.San Diego market in 

Due to the ratio of U.S. and Mexican-licensed stations, San Diego is the largest media market in the United States that is legally unable to support a television station duopoly between two full-power stations under FCC regulations, which disallow duopolies in metropolitan areas with fewer than nine full-power television stations and require that there must be eight unique station owners that remain once a duopoly is formed (there are only seven full-power stations on the California side of the San Diego-Tijuana market)."FCC revives local television ownership rules". Federal Communications Commission. August 5, 1999. Though the E. W. Scripps Company owns KGTV and KZSD-LP, they are not considered a duopoly under the FCC's legal definition as common ownership between full-power and low-power television stations in the same market is permitted regardless to the number of stations licensed to the area. As a whole, the Mexico side of the San Diego-Tijuana market has two duopolies and one triopoly (Entravision Communications owns both XHAS-TV and XHDTV-TV, Azteca owns XHJK-TV and XHTIT-TV, and Grupo Televisa owns XHUAA-TV and XHWT-TV along with being the license holder for XETV-TV, which was formerly managed by California-based subsidiary Bay City Television).

San Diego's television market is limited to only San Diego county. The Imperial Valley has its own market (which also extends into western Arizona), while neighboring Orange and Riverside counties are part of the Los Angeles market. (Sometimes in the past, a missing network affiliate in the Imperial Valley would be available on cable TV from San Diego.)

The radio stations in San Diego include nationwide broadcaster, iHeartMedia; CBS Radio, Midwest Television, Entercom Communications, Finest City Broadcasting, and many other smaller stations and networks. Stations include: KOGO AM 600, KFMB AM 760, KCEO AM 1000, KCBQ AM 1170, K-Praise, KLSD AM 1360 Air America, KFSD 1450 AM, KPBS-FM 89.5, Channel 933, Star 94.1, FM 94/9, FM News and Talk 95.7, Q96 96.1, KyXy 96.5, Free Radio San Diego (AKA Pirate Radio San Diego) 96.9FM FRSD, KEGY 97.3, KXSN 98.1, Jack-FM 100.7, 101.5 KGB-FM, KLVJ 102.1, KSON 103.7, Rock 105.3, and another Pirate Radio station at 106.9FM, as well as a number of local Spanish-language radio stations.

Infrastructure

Utilities
Water is supplied to residents by the Water Department of the City of San Diego. The city receives most of its water from the Metropolitan Water District of Southern California.

Gas and electric utilities are provided by San Diego Gas & Electric, a division of Sempra Energy.

Street lights
In the mid-20th century the city had mercury vapor street lamps. In 1978, the city decided to replace them with more efficient sodium vapor lamps. This triggered an outcry from astronomers at Palomar Observatory  north of the city, concerned that the new lamps would increase light pollution and hinder astronomical observation. The city altered its lighting regulations to limit light pollution within  of Palomar.

In 2011, the city announced plans to upgrade 80% of its street lighting to new energy-efficient lights that use induction technology, a modified form of fluorescent lamp producing a broader spectrum than sodium vapor lamps. The new system is predicted to save $2.2 million per year in energy and maintenance. The city stated the changes would "make our neighborhoods safer." They also increase light pollution.City of San Diego official website, "Street Division: Electrical Street Lights" Retrieved February 15, 2014

In 2014, San Diego announced plans to become the first U.S. city to install cyber-controlled street lighting, using an "intelligent" lighting system to control 3,000 LED street lights.

Transportation

thumb|left|I-5 looking south toward downtown San Diego
With the automobile being the primary means of transportation for over 80 percent of residents, San Diego is served by a network of freeways and highways. This includes Interstate 5, which runs south to Tijuana and north to Los Angeles; Interstate 8, which runs east to Imperial County and the Arizona Sun Corridor; Interstate 15, which runs northeast through the Inland Empire to Las Vegas and Salt Lake City; and Interstate 805, which splits from I-5 near the Mexican border and rejoins I-5 at Sorrento Valley.

Major state highways include SR 94, which connects downtown with I-805, I-15 and East County; SR 163, which connects downtown with the northeast part of the city, intersects I-805 and merges with I-15 at Miramar; SR 52, which connects La Jolla with East County through Santee and SR 125; SR 56, which connects I-5 with I-15 through Carmel Valley and Rancho Peñasquitos; SR 75, which spans San Diego Bay as the San Diego-Coronado Bridge, and also passes through South San Diego as Palm Avenue; and SR 905, which connects I-5 and I-805 to the Otay Mesa Port of Entry.

The stretch of SR 163 that passes through Balboa Park is San Diego's oldest freeway, and has been called one of America's most beautiful parkways.Marshall, David. San Diego's Balboa Park. Arcadia Publishing. 2007.

San Diego's roadway system provides an extensive network of cycle routes. Its dry and mild climate makes cycling a convenient year-round option; however, the city's hilly terrain and long average trip distances make cycling less practicable. Older and denser neighborhoods around the downtown tend to be oriented to utility cycling. This is partly because of the grid street patterns now absent in newer developments farther from the urban core, where suburban style arterial roads are much more common. As a result, a majority of cycling is recreational. In 2006, San Diego was rated the best city (with a population over 1 million) for cycling in the U.S.

thumb|right|260px|View of Coronado and San Diego from the air

San Diego is served by the San Diego Trolley light rail system, by the SDMTS bus system, and by Coaster and Amtrak Pacific Surfliner commuter rail; northern San Diego county is also served by the Sprinter light rail line. The trolley primarily serves downtown and surrounding urban communities, Mission Valley, east county, and coastal south bay. A planned mid-coast extension of the Trolley will operate from Old Town to University City and the University of California, San Diego along the I-5 Freeway, with planned operation by 2018. The Amtrak and Coaster trains currently run along the coastline and connect San Diego with Los Angeles, Orange County, Riverside, San Bernardino, and Ventura via Metrolink and the Pacific Surfliner. There are two Amtrak stations in San Diego, in Old Town and the Santa Fe Depot downtown. San Diego transit information about public transportation and commuting is available on the Web and by dialing "511" from any phone in the area.

The city has two major commercial airports within or near its city limits. Downtown San Diego International Airport (SAN), also known as Lindbergh Field, is the busiest single-runway airport in the United States. It served over 17 million passengers in 2005, and is dealing with larger numbers every year. It is located on San Diego Bay,  from downtown, and maintains scheduled flights to the rest of the United States (including Hawaii), as well as to Canada, Mexico, Japan, and the United Kingdom. It is operated by an independent agency, the San Diego Regional Airport Authority. Tijuana International Airport has a terminal within the city limits in the Otay Mesa district connected to the rest of the airport in Tijuana, Mexico via the Cross Border Xpress cross-border footbridge. It is the primary airport for flights to the rest of Mexico, and offers connections via Mexico City to the rest of Latin America. In addition, the city has two general-aviation airports, Montgomery Field (MYF) and Brown Field (SDM).

 thumb|left|Cross Border Xpress bridge from the terminal in San Diego on the right to the main terminal of Tijuana Airport on the left

Recent regional transportation projects have sought to mitigate congestion, including improvements to local freeways, expansion of San Diego Airport, and doubling the capacity of the cruise ship terminal. Freeway projects included expansion of Interstates 5 and 805 around "The Merge" where these two freeways meet, as well as expansion of Interstate 15 through North County, which includes new high-occupancy-vehicle (HOV) "managed lanes". A tollway (the southern portion of SR 125, known as the South Bay Expressway) connects SR 54 and Otay Mesa, near the Mexican border. According to an assessment in 2007, 37 percent of city streets were in acceptable condition. However, the proposed budget fell $84.6 million short of bringing streets up to an acceptable level. Expansion at the port has included a second cruise terminal on Broadway Pier, opened in 2010. Airport projects include expansion of Terminal Two.

Notable people

Sister cities
San Diego has 17 sister cities, as designated by Sister Cities International:

  Alcalá de Henares, Spain
  Campinas, Brazil
  Cúcuta, Colombia
  Cavite City, Philippines
  Edinburgh, Scotland, United Kingdom
  Jalalabad, Afghanistan
  Jeonju, South Korea
  León, Mexico
  Perth, Australia
  Quanzhou, China
  Taichung City, Taiwan
  Tema, Ghana
  Tijuana, Mexico
  Vladivostok, Russia
  Warsaw, Poland
  Yantai, China
  Yokohama, Japan

See also
 1858 San Diego hurricane

Notes

References

Bibliography

 
 

External links

 
 Civic San Diego (replaced redevelopment corporations)
 SANDAG, San Diego's Regional Planning Agency
 Demographic Fact Sheet from Census Bureau
 San Diego Historical Society
 San Diego Unified School District
 San Diego Public Library
 San Diego Tourism Authority (formerly the San Diego Convention and Visitors Bureau)

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