St. Jacob, IL -- U.S. village in Illinois Population (2000): 801 Housing Units (2000): 321 Land area (2000): 0.558909 sq. miles (1.447568 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.558909 sq. miles (1.447568 sq. km) FIPS code: 66859 Located within: Illinois (IL), FIPS 17 Location: 38.716897 N, 89.767122 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: St. Jacob, IL St. Jacob