Thermopolis, WY -- U.S. town in Wyoming Population (2000): 3172 Housing Units (2000): 1568 Land area (2000): 2.383214 sq. miles (6.172495 sq. km) Water area (2000): 0.085464 sq. miles (0.221352 sq. km) Total area (2000): 2.468678 sq. miles (6.393847 sq. km) FIPS code: 76515 Located within: Wyoming (WY), FIPS 56 Location: 43.645667 N, 108.214641 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Thermopolis, WY Thermopolis