Del Mar is a beach city in San Diego County, California. The population was estimated at 4,311 in 2014, up from 4,161 at the 2010 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 km2) from Enoch Talbert in 1885, with visions of building a seaside resort for the rich and famous. The United States Navy operated a Naval Auxiliary Air Facility for blimps at Del Mar during World War II.