Flat Rock, MI -- U.S. city in Michigan Population (2000): 8488 Housing Units (2000): 3291 Land area (2000): 6.699623 sq. miles (17.351943 sq. km) Water area (2000): 0.101597 sq. miles (0.263134 sq. km) Total area (2000): 6.801220 sq. miles (17.615077 sq. km) FIPS code: 28360 Located within: Michigan (MI), FIPS 26 Location: 42.101842 N, 83.272857 W ZIP Codes (1990): 48134 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Flat Rock, MI Flat Rock