Rancho San Diego, California Rancho San Diego, California Rancho San Diego is a census-designated place (CDP) in San Diego County, California. The population was 21,208 at the 2010 census, up from 20,155 at the 2000 census. The area was developed as subdivisions beginning in the 1970s. Rancho San Diego is located at (32.765985, -116.921477). According to the United States Census Bureau, the CDP has a total area of , all land. The chance of earthquake damage in Rancho San Diego is much lower than California average and is much higher than the national average. The risk of tornado damage in Rancho San Diego is
National Register of Historic Places listings in San Diego County, California were once listed but have been removed. National Register of Historic Places listings in San Diego County, California This is a list of the National Register of Historic Places listings in San Diego County, California. This is intended to be a complete list of the properties and districts on the National Register of Historic Places in San Diego County, California, United States. Latitude and longitude coordinates are provided for many National Register properties and districts; these locations may be seen together in an online map. There are 149 properties and districts listed on the National Register in the county, including