California is a borough in Washington County, Pennsylvania, United States, along the Monongahela River. The population was 5,274 as of the 2000 census. 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 / 40.06528°N 79.89722°W / 40.06528; -79.89722 (40.065313, -79.897120).
According to the United States Census Bureau, the borough has a total area of 11.2 square miles (29.1 km²), of which, 11.0 square miles (28.6 km²) of it is land and 0.2 square miles (0.5 km²) of it (1.78%) is water.