Mark, IL -- U.S. village in Illinois Population (2000): 491 Housing Units (2000): 209 Land area (2000): 0.811747 sq. miles (2.102416 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.811747 sq. miles (2.102416 sq. km) FIPS code: 46981 Located within: Illinois (IL), FIPS 17 Location: 41.265594 N, 89.248521 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Mark, IL Mark