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Here are all the possible meanings and translations of the word Pasadena. Princeton's WordNet(0.00 / 0 votes)Rate this definition: Pasadena(noun) a city in southwestern California to the east of Los Angeles. Pasadena. Pasadena is a city in Los Angeles County, California, United States. As of 2010 United States Census, the population of Pasadena was 137,122, making it the 180th-largest city in the United States, down from 168th place in 2009.
Pasadena is the ninth-largest city in Los Angeles County. Pasadena was incorporated on June 19, 1886, becoming only the second city to be incorporated in what is now Los Angeles County, after Los Angeles (April 4, 1850). It is one of the primary cultural centers of the San Gabriel Valley.he Pasadena Police Department serves most of the city of Pasadena. Unincorporated portions of the city are part of Los Angeles County and are served by the Los Angeles County Sheriff's Department (LASD) and the Altadena Station in Altadena serves nearby portions of Pasadena.