Some of the cities, towns, and places in San Mateo County are Atherton, Belmont, Brisbane, Broadmoor, Burlingame, Colma, Daly City, East Palo Alto, El Granada, Emerald Lake Hills, Foster City, Half Moon Bay, Highlands-Baywood Park, Hillsborough, Kings Mountain, La Honda, Ladera, Loma Mar, Los Trancos Woods, Menlo Oaks, Menlo Park, Millbrae, Montara, Moss Beach, North Fair Oaks, Pacifica, Pescadero, Portola Valley, Princeton-by-the-Sea, Redwood City, San Bruno, San Carlos, San Gregorio, San Mateo, Sky Londa, South San Francisco, West Menlo Park, Woodside
San Mateo County ( SAN mə-TAY-oh), officially the County of San Mateo, is a county located in the U.S. state of California. As of the 2010 census, the population was 718,451. The county seat is Redwood City. San Mateo County is included in the San Francisco-Oakland-Berkeley, CA MSA (metropolitan statistical area), Silicon Valley, and is part of the San Francisco Bay Area, the nine counties bordering San Francisco Bay. It covers most of the San Francisco Peninsula. San Francisco International Airport is located at the northern end of the county. The county's built-up areas are mostly suburban with some areas being very urban, and are home to several corporate campuses.