Monroe -- U.S. County in Michigan Population (2000): 145945 Housing Units (2000): 56471 Land area (2000): 551.100358 sq. miles (1427.343313 sq. km) Water area (2000): 128.927641 sq. miles (333.921043 sq. km) Total area (2000): 680.027999 sq. miles (1761.264356 sq. km) Located within: Michigan (MI), FIPS 26 Location: 41.919053 N, 83.484125 W Headwords: Monroe Monroe, MI Monroe County Monroe County, MI