Grundy -- U.S. County in Missouri Population (2000): 10432 Housing Units (2000): 5102 Land area (2000): 435.817114 sq. miles (1128.761096 sq. km) Water area (2000): 2.162421 sq. miles (5.600644 sq. km) Total area (2000): 437.979535 sq. miles (1134.361740 sq. km) Located within: Missouri (MO), FIPS 29 Location: 40.108464 N, 93.585174 W Headwords: Grundy Grundy, MO Grundy County Grundy County, MO