Historical Marker
The Clayton Post Office
Historical marker location:
6150 Center Street, Clayton, California
( Marker is on Center Street west of Marsh Creek Road, on the right when traveling east.)
Marker installed: 2001
California was the site of the nation's first successful oil well in 1892. The well was drilled in the city of Los Angeles and produced about 25 barrels of oil a day. Today, California remains a major oil-producing state.