Williamston, MI -- U.S. city in Michigan Population (2000): 3441 Housing Units (2000): 1528 Land area (2000): 2.546675 sq. miles (6.595857 sq. km) Water area (2000): 0.025621 sq. miles (0.066359 sq. km) Total area (2000): 2.572296 sq. miles (6.662216 sq. km) FIPS code: 87420 Located within: Michigan (MI), FIPS 26 Location: 42.688838 N, 84.284581 W ZIP Codes (1990): 48895 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Williamston, MI Williamston