San Marcos is a city located in the northern portion of San Diego County, California, USA. As of 2009, the city had a total population of 82,743. Outside the San Diego region, it is best known as the home of California State University, San Marcos.
Neighborhoods in San Marcos: Arbor Ranch, Grand Estates, Mira Lago, Paloma, Rancho Coronado, Richland Villas, San Elijo Hills, University Commons