Seneca, KS -- U.S. city in Kansas Population (2000): 2122 Housing Units (2000): 978 Land area (2000): 1.543272 sq. miles (3.997055 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 1.543272 sq. miles (3.997055 sq. km) FIPS code: 63950 Located within: Kansas (KS), FIPS 20 Location: 39.835693 N, 96.066054 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Seneca, KS Seneca