DeKalb -- U.S. County in Alabama Population (2000): 64452 Housing Units (2000): 28051 Land area (2000): 777.912805 sq. miles (2014.784830 sq. km) Water area (2000): 0.736851 sq. miles (1.908435 sq. km) Total area (2000): 778.649656 sq. miles (2016.693265 sq. km) Located within: Alabama (AL), FIPS 01 Location: 34.459133 N, 85.798919 W Headwords: DeKalb DeKalb, AL DeKalb County DeKalb County, AL