Clarksville (Tong Ranch) is an unincorporated community in El Dorado County, California. It is located west-southwest of Placerville, at an elevation of 676 feet (206 m). A post office operated at Clarksville from 1855 to 1924 and from 1927 to 1934. References Unincorporated communities in California Unincorporated communities in El Dorado County, California Populated places established in 1855 1855 establishments in California