Radium, KS -- U.S. city in Kansas Population (2000): 40 Housing Units (2000): 19 Land area (2000): 0.041442 sq. miles (0.107335 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.041442 sq. miles (0.107335 sq. km) FIPS code: 58300 Located within: Kansas (KS), FIPS 20 Location: 38.173698 N, 98.894222 W ZIP Codes (1990): 67550 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Radium, KS Radium