A number of places in the United States: • A city, the county seat of Johnson County, Arkansas. • An unincorporated community in California. • An unincorporated community in Delaware. • An unincorporated community in Idaho. • An unincorporated community in Illinois. • A town in Clark County, Indiana; named for explorer William Clark. • An unincorporated community in Hamilton County, Indiana; named for George Rogers Clark. • A city in Iowa. • An unincorporated community in Howard County, Maryland; named for William Clark. • A village in Michigan. • A city in Missouri, named for William Clark. • A town in New Hampshire; named for the Clark family, who cleared the land for settlement. • An unincorporated community in Hunterdon County, New Jersey. • An unincorporated community in Mercer County, New Jersey. • A town in Allegheny County, New York; named for Holland Land Company agent S. N. Clark. • A hamlet in the town of New Scotland, New York; named for early settler Adam A. Clark. • A ghost town in Defiance County, Ohio; named for proprietor Elisha Clark. • A village in Clinton County, Ohio; named for Sarah Clark Hadley, an early settler. • An unincorporated community in Perry County, Ohio; named for founder Daniel Clark. • An unincorporated community in Oklahoma. • A borough in Pennsylvania. • A city, the county seat of Montgomery County, Tennessee; named for George Rodgers Clark. • A city, the county seat of Red River County, Texas; named for founder James Clark. • A town in Virginia; named for founder Clarke Royster. • A community in Nova Scotia.