St. Johns, MI -- U.S. city in Michigan Population (2000): 7485 Housing Units (2000): 3148 Land area (2000): 3.920598 sq. miles (10.154301 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 3.920598 sq. miles (10.154301 sq. km) FIPS code: 70940 Located within: Michigan (MI), FIPS 26 Location: 43.000868 N, 84.556630 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: St. Johns, MI St. Johns