St. Marys, KS -- U.S. city in Kansas Population (2000): 2198 Housing Units (2000): 818 Land area (2000): 1.106145 sq. miles (2.864903 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 1.106145 sq. miles (2.864903 sq. km) FIPS code: 62400 Located within: Kansas (KS), FIPS 20 Location: 39.196273 N, 96.068672 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: St. Marys, KS St. Marys