Calhoun -- U.S. County in Michigan Population (2000): 137985 Housing Units (2000): 58691 Land area (2000): 708.716208 sq. miles (1835.566474 sq. km) Water area (2000): 9.724405 sq. miles (25.186093 sq. km) Total area (2000): 718.440613 sq. miles (1860.752567 sq. km) Located within: Michigan (MI), FIPS 26 Location: 42.278575 N, 85.076092 W Headwords: Calhoun Calhoun, MI Calhoun County Calhoun County, MI