St. Joseph, IL -- U.S. village in Illinois Population (2000): 2912 Housing Units (2000): 1157 Land area (2000): 1.132046 sq. miles (2.931985 sq. km) Water area (2000): 0.004039 sq. miles (0.010462 sq. km) Total area (2000): 1.136085 sq. miles (2.942447 sq. km) FIPS code: 66950 Located within: Illinois (IL), FIPS 17 Location: 40.112935 N, 88.037589 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: St. Joseph, IL St. Joseph