Hays, MT -- U.S. Census Designated Place in Montana Population (2000): 702 Housing Units (2000): 207 Land area (2000): 13.023374 sq. miles (33.730382 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 13.023374 sq. miles (33.730382 sq. km) FIPS code: 35275 Located within: Montana (MT), FIPS 30 Location: 47.989164 N, 108.687493 W ZIP Codes (1990): 59527 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Hays, MT Hays