35645 -- U.S. ZIP code Municipality (1990): KILLEN, Alabama All ZIPs for this municipality (1990): 35645 Population (2000): 12945 Housing Units (2000): 5373 Land area (2000): 87.840392 sq. miles (227.505562 sq. km) Water area (2000): 0.018079 sq. miles (0.046824 sq. km) Total area (2000): 87.858471 sq. miles (227.552386 sq. km) Located within: Alabama (AL) Location: 34.904208 N, 87.507766 W