60559 -- U.S. ZIP code Municipality (1990): WESTMONT, Illinois All ZIPs for this municipality (1990): 60559 Population (2000): 25954 Housing Units (2000): 10743 Land area (2000): 5.452272 sq. miles (14.121320 sq. km) Water area (2000): 0.017490 sq. miles (0.045298 sq. km) Total area (2000): 5.469762 sq. miles (14.166618 sq. km) Located within: Illinois (IL) Location: 41.795358 N, 87.977787 W