Richmond is a city in western Contra Costa County, California, United States. It is in the East Bay, part of the San Francisco Bay Area. It almost surrounds the city of San Pablo, and the unincorporated areas of North Richmond, El Sobrante, and East Richmond Heights. Bay Area Rapid Transit and Amtrak share a station in Richmond, which serves as a regional transit interchange. The city is headed by mayor Irma A. Anderson. As of the July 1, 2005 US Census estimate, the city has a population of 102,186, while the California Department of Finance estimates the city's population at 103,468, as of January 1, 2006.[1] This makes Richmond the 56th largest in the state behind Berkeley and ahead of Santa Clara, which are both Bay Area neighbors