62991 -- U.S. ZIP code Municipality (1990): TUNNEL HILL, Illinois All ZIPs for this municipality (1990): 62991 Population (2000): 685 Housing Units (2000): 418 Land area (2000): 34.133915 sq. miles (88.406431 sq. km) Water area (2000): 0.037921 sq. miles (0.098214 sq. km) Total area (2000): 34.171836 sq. miles (88.504645 sq. km) Located within: Illinois (IL) Location: 37.540479 N, 88.866018 W