Monroe -- U.S. County in Indiana Population (2000): 120563 Housing Units (2000): 50846 Land area (2000): 394.346144 sq. miles (1021.351780 sq. km) Water area (2000): 16.971295 sq. miles (43.955450 sq. km) Total area (2000): 411.317439 sq. miles (1065.307230 sq. km) Located within: Indiana (IN), FIPS 18 Location: 39.161997 N, 86.540369 W Headwords: Monroe Monroe, IN Monroe County Monroe County, IN