San Carlos is a city in San Mateo County, California, United States. The population is 30,722 per the 2020 census. Prior to the Spanish arrival in 1769, the land of San Carlos was occupied by a group of Native Americans who called themselves the Lamchins. While they considered themselves to have a separate identity from other local tribes, modern scholars consider them to be a part of the Ohlone or Costanoan tribes that inhabited the Bay Area.
Country: United States
State: California
County: San Mateo
Incorporated: July 8, 1925
Elevation: 33 ft (10 m)
Area code: 650
Named for: Unknown (suggested to be San Carlos, King Charles III, Feast of St. Charles)