60538 -- U.S. ZIP code Municipality (1990): MONTGOMERY, Illinois All ZIPs for this municipality (1990): 60538 Population (2000): 13702 Housing Units (2000): 5158 Land area (2000): 4.613462 sq. miles (11.948812 sq. km) Water area (2000): 0.025448 sq. miles (0.065910 sq. km) Total area (2000): 4.638910 sq. miles (12.014722 sq. km) Located within: Illinois (IL) Location: 41.721886 N, 88.329729 W