Clayton (formerly, Clayton’s and Claytonville) is a city in Contra Costa County, California, United States. The population was 10,897 as of the 2010 census.
According to the United States Census Bureau, the city has a total area of 3.8 square miles (9.8 km2), all land.
Clayton is located at the foot of Mt. Diablo State Park.
This region experiences warm (but not hot) and dry summers, with no average monthly temperatures above 71.6 °F. According to the Köppen Climate Classification system, Clayton has a warm-summer Mediterranean climate, abbreviated “Csb” on climate maps.
The public schools of which the minors of Clayton attend include: Mt. Diablo Elementary School, Highlands Elementary School, Diablo View Middle School, Pine Hollow Middle School, and Clayton Valley Charter High School.
The Clayton branch of the Contra Costa County Library system is located in Clayton.
The city of Clayton is served by the daily newspaper Contra Costa Times published by Bay Area News Group-East Bay (part of the Media News Group, Denver, Colorado), and by the local newspapers The Clayton Pioneer and “The Clayton Gazette” (www.claytongazette.com).
Clayton is also served by Claycord.com a local news and talk blog covering community news and events.