California is a borough on the Monongahela River in Washington County, Pennsylvania, United States, and part of the Pittsburgh metropolitan area since 1950. The population was 6,795 as of the 2010 census and was estimated at 6,325 in 2018. California is the home of California University of Pennsylvania. Founded in 1849, the borough was named for the territory of California following the Gold Rush. The borough has had two notably young mayors—Democrat Peter Daley, who was 22 at his election, and Republican Casey Durdines, who was 20 at his election.
California is located at 40°3′55″N 79°53′50″W (40.065313, -79.897120).
According to the United States Census Bureau, the borough has a total area of 11.2 square miles (29 km2), of which 11.0 square miles (28 km2) is land and 0.2 square miles (0.52 km2) (1.78%) is water.
California has seven land borders, including Fallowfield Township to the north, Long Branch and Elco to the northeast, Coal Center to the mideast, West Brownsville to the southeast, Centerville from the south to the west-southwest, and West Pike Run Township to the west. Across the Monongahela River in Fayette County, California runs adjacent with Newell and Jefferson Township.
When founded in 1849, the town was named California, though Columbia and Sagamore were names that were also suggested for the new town. Before there were mayors in California, there were burgesses, the first of whom was Solomon Sibbitt.