Pittsfield, IL -- U.S. city in Illinois Population (2000): 4211 Housing Units (2000): 1985 Land area (2000): 3.574072 sq. miles (9.256804 sq. km) Water area (2000): 0.044816 sq. miles (0.116072 sq. km) Total area (2000): 3.618888 sq. miles (9.372876 sq. km) FIPS code: 60222 Located within: Illinois (IL), FIPS 17 Location: 39.609599 N, 90.808389 W ZIP Codes (1990): 62363 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Pittsfield, IL Pittsfield