Roundup, MT -- U.S. city in Montana Population (2000): 1931 Housing Units (2000): 978 Land area (2000): 1.343016 sq. miles (3.478396 sq. km) Water area (2000): 0.001627 sq. miles (0.004214 sq. km) Total area (2000): 1.344643 sq. miles (3.482610 sq. km) FIPS code: 64525 Located within: Montana (MT), FIPS 30 Location: 46.448401 N, 108.542676 W ZIP Codes (1990): 59072 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Roundup, MT Roundup