Callaway -- U.S. County in Missouri Population (2000): 40766 Housing Units (2000): 16167 Land area (2000): 838.836242 sq. miles (2172.575802 sq. km) Water area (2000): 8.194079 sq. miles (21.222566 sq. km) Total area (2000): 847.030321 sq. miles (2193.798368 sq. km) Located within: Missouri (MO), FIPS 29 Location: 38.824557 N, 91.945725 W Headwords: Callaway Callaway, MO Callaway County Callaway County, MO