Dallam -- U.S. County in Texas Population (2000): 6222 Housing Units (2000): 2697 Land area (2000): 1504.693574 sq. miles (3897.138301 sq. km) Water area (2000): 0.563975 sq. miles (1.460688 sq. km) Total area (2000): 1505.257549 sq. miles (3898.598989 sq. km) Located within: Texas (TX), FIPS 48 Location: 36.192362 N, 102.664932 W Headwords: Dallam Dallam, TX Dallam County Dallam County, TX