Muddy, MT -- U.S. Census Designated Place in Montana Population (2000): 627 Housing Units (2000): 160 Land area (2000): 28.561963 sq. miles (73.975142 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 28.561963 sq. miles (73.975142 sq. km) FIPS code: 52315 Located within: Montana (MT), FIPS 30 Location: 45.599225 N, 106.739578 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Muddy, MT Muddy