Encinitas is a beach city in the North County area of San Diego County, California. Located within Southern California, it is approximately 25 …Encinitas is a beach city in the North County area of San Diego County, California. Located within Southern California, it is approximately 25 miles north of San Diego, between Solana Beach and Carlsbad, and about 95 miles south of Los Angeles. As of the 2020 United States census, the city had a population of 62,007, up from 59,518 at the 2010 census.