60551 -- U.S. ZIP code Municipality (1990): SHERIDAN, Illinois All ZIPs for this municipality (1990): 60551 Population (2000): 5168 Housing Units (2000): 1297 Land area (2000): 56.942201 sq. miles (147.479618 sq. km) Water area (2000): 0.066796 sq. miles (0.173002 sq. km) Total area (2000): 57.008997 sq. miles (147.652620 sq. km) Located within: Illinois (IL) Location: 41.527585 N, 88.682923 W