Clinton -- U.S. County in Ohio Population (2000): 40543 Housing Units (2000): 16577 Land area (2000): 410.879426 sq. miles (1064.172782 sq. km) Water area (2000): 1.405579 sq. miles (3.640434 sq. km) Total area (2000): 412.285005 sq. miles (1067.813216 sq. km) Located within: Ohio (OH), FIPS 39 Location: 39.419135 N, 83.828623 W Headwords: Clinton Clinton, OH Clinton County Clinton County, OH