Jamestown is a census-designated place (CDP) in Tuolumne County, California, United States. The population was 3,433 at the 2010 census, up from 3,017 at the 2000 census. Formerly a California Gold Rush town, Jamestown is now a California Historical Landmark. A scene from the movie Hidalgo was filmed in Jamestown. Exterior scenes from the TV series Petticoat Junction and Green Acres were filmed in and near Jamestown.