San Marcos, California

San Marcos population, 2020 to 2024

San Marcos added 1,682 residents from July 2020 to July 2024, a change of +1.8%. In the latest year it moved by +1,425. Among 429 California places of 5,000 or more, that growth ranks 97th; the median place changed by -1.1%. The median place of 5,000+ in California has 37,056 people, so San Marcos is 2.6 times that size.

San Marcos covers 24.57 square miles of land and 0.02 of water, for 3,932 people per square mile of land. The median California place of 5,000+ has 3,725, so San Marcos is close to the typical town.

What county San Marcos is in

All of San Marcos's residents live in San Diego County, which had 3,298,799 residents in 2024. San Marcos holds 2.9% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.

ZIP codes in San Marcos

3 ZIP Code Tabulation Areas (ZCTAs) overlap San Marcos by at least 10% of the ZCTA's or the city's land: 92069, 92078, 92096. ZCTAs are Census approximations of USPS ZIP code delivery areas. The list comes from the 2020 ZCTA to place relationship file, so a city that annexed land after 2020 may reach into ZIP codes not listed here.

Where San Marcos is

The Census internal point of San Marcos is at 33.132600, -117.169900. Sacramento, the capital, is 447.2 miles NNW in a straight line. The nearest larger place is Escondido, CA (148,847 people), 5.5 miles away.

Daylight in San Marcos

At 33.13° N, San Marcos gets about 14 h 21 min of daylight around the June solstice and 9 h 58 min around the December solstice, a swing of 4 h 23 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.

Places near San Marcos

The eight nearest incorporated places of 1,000+ in California, measured between internal points. The closest is Escondido, 5.5 miles away, with 148,847 people.