Monroe -- U.S. County in Ohio Population (2000): 15180 Housing Units (2000): 7212 Land area (2000): 455.541710 sq. miles (1179.847563 sq. km) Water area (2000): 1.916964 sq. miles (4.964915 sq. km) Total area (2000): 457.458674 sq. miles (1184.812478 sq. km) Located within: Ohio (OH), FIPS 39 Location: 39.732661 N, 81.078996 W Headwords: Monroe Monroe, OH Monroe County Monroe County, OH