Richmond is a city in western Contra Costa County, California, United States. The city was incorporated on August 7, 1905. Located in the eastern region of the San Francisco Bay Area, Richmond borders the city of San Pablo and the unincorporated areas of North Richmond, El Sobrante and East Richmond Heights. Under the McLaughlin Administration, Richmond is the largest city in the United States served by a Green Party Mayor. As of the 2010 U.S. Census, the city's population is at 103,701.