San Mateo County, 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

County

United States of America

County governments in the United States function as local administrative arms within the states. County governments serve a larger geographical area than cities and towns, but a smaller area than states.  As such, they are essentially administrative units of the state. The most common form of county government is the commission system. Under this structure, an elected commission, which generally consists of a small number of commissioners, serves as the governing body within the county, performing all legislative and executive functions. These include adopting a budget, passing county resolutions, and hiring and firing county officials. The highest-ranking county official is typically known as the county commissioner or county supervisor.

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