San Mateo County California Cities/Towns - Atherton, Belmont, Brisbane, Broadmoor, Burlingame, Colma, Daly City, East Palo Alto, El Granada, Foster City, Half Moon Bay, Highlands-Baywood Park, Hillsborough, La Honda, Loma Mar, Menlo Park, Millbrae, Montara, Moss Beach, Pacifica, Pescadero, Portola Valley, Redwood City (County Seat), San Bruno, San Carlos, San Gregorio, San Mateo, South San Francisco, West Menlo Park, Woodside

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Your Ad Here San Mateo County (pronounced "san muh-TAY-o") (Spanish for: St. Matthew County) is a county located the U.S. state of California. As of 2005 the population was 712,462. The county seat is Redwood City. History San Mateo County was formed in 1856. The county bears the Spanish name for Saint Matthew. As a place name, San Mateo appears as early as 1776 and several local geographic features were also designated San Mateo on early maps including variously: a settlement, an arroyo, a headland jutting into the Pacific (Point Montara), and a large land holding (Rancho San Mateo). Until about 1850, the name appeared as San Matheo.