Mount Zion, IL -- U.S. village in Illinois Population (2000): 4845 Housing Units (2000): 1884 Land area (2000): 3.768265 sq. miles (9.759762 sq. km) Water area (2000): 0.000260 sq. miles (0.000674 sq. km) Total area (2000): 3.768525 sq. miles (9.760436 sq. km) FIPS code: 51206 Located within: Illinois (IL), FIPS 17 Location: 39.777967 N, 88.878614 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Mount Zion, IL Mount Zion