Sidney, MT -- U.S. city in Montana Population (2000): 4774 Housing Units (2000): 2393 Land area (2000): 2.246240 sq. miles (5.817735 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 2.246240 sq. miles (5.817735 sq. km) FIPS code: 67900 Located within: Montana (MT), FIPS 30 Location: 47.712519 N, 104.161486 W ZIP Codes (1990): 59270 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Sidney, MT Sidney