35643 -- U.S. ZIP code Municipality (1990): HILLSBORO, Alabama All ZIPs for this municipality (1990): 35643 Population (2000): 3361 Housing Units (2000): 1445 Land area (2000): 82.465498 sq. miles (213.584650 sq. km) Water area (2000): 16.377923 sq. miles (42.418624 sq. km) Total area (2000): 98.843421 sq. miles (256.003274 sq. km) Located within: Alabama (AL) Location: 34.648768 N, 87.203946 W