60656 -- U.S. ZIP code Municipality (1990): HARWOOD HEIGHTS, Illinois All ZIPs for this municipality (1990): 60656 Population (2000): 27129 Housing Units (2000): 12665 Land area (2000): 3.559398 sq. miles (9.218798 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 3.559398 sq. miles (9.218798 sq. km) Located within: Illinois (IL) Location: 41.975080 N, 87.816307 W