where is del mar ca
Del Mar, CA. Sponsored Topics. Del Mar is an upscale beach city in San Diego County, California. The population was 4,161 at the 2010 census, down from 4,389 at the 2000 census. The San Diego County Fair is hosted on the Del Mar Fairgrounds every summer. Del Mar is Spanish for of the sea or by the sea, because it is located on the Pacific Ocean.