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San Mateo County
San Mateo County is a county located in the San Francisco Bay Area of the state of California in the United States. It covers most of the south just on the San Francisco peninsula and the north of Santa Clara county. The San Francisco International Airport is located at the northern end of the county, and the Silicon Valley or Silicon Valley begins at the southern end. In the year 2007 the population was 721,161 in a population density of 375 people per km / 2. The county seat is Redwood City, is the second county with large number of Hispanics in Northern California after Santa Clara County.