Killeen, TX -- U.S. city in Texas Population (2000): 86911 Housing Units (2000): 35343 Land area (2000): 35.345945 sq. miles (91.545574 sq. km) Water area (2000): 0.052625 sq. miles (0.136297 sq. km) Total area (2000): 35.398570 sq. miles (91.681871 sq. km) FIPS code: 39148 Located within: Texas (TX), FIPS 48 Location: 31.105591 N, 97.726586 W ZIP Codes (1990): 76541 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Killeen, TX Killeen