Formoso, KS -- U.S. city in Kansas Population (2000): 129 Housing Units (2000): 78 Land area (2000): 0.280655 sq. miles (0.726892 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.280655 sq. miles (0.726892 sq. km) FIPS code: 23825 Located within: Kansas (KS), FIPS 20 Location: 39.779355 N, 97.992458 W ZIP Codes (1990): 66942 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Formoso, KS Formoso