Del Mar is an affluent beach town in San Diego County, California. The population was 4,161 at the 2010 census, down from 4,389 at the 2000 census. The Del Mar Horse Races are hosted on the Del Mar Racetrack every summer. Del Mar is Spanish for "of the sea" or "by the sea", because it is located on the Pacific Ocean. Colonel Jacob Taylor purchased 338 acres (1.37 km) from Enoch Talbert in 1885, with visions of building a seaside resort for the rich and famous.