Portland, MI -- U.S. city in Michigan Population (2000): 3789 Housing Units (2000): 1574 Land area (2000): 2.401533 sq. miles (6.219941 sq. km) Water area (2000): 0.119872 sq. miles (0.310467 sq. km) Total area (2000): 2.521405 sq. miles (6.530408 sq. km) FIPS code: 65860 Located within: Michigan (MI), FIPS 26 Location: 42.868176 N, 84.902938 W ZIP Codes (1990): 48875 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Portland, MI Portland