Dorchester, IL -- U.S. village in Illinois Population (2000): 142 Housing Units (2000): 61 Land area (2000): 0.715471 sq. miles (1.853061 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.715471 sq. miles (1.853061 sq. km) FIPS code: 20370 Located within: Illinois (IL), FIPS 17 Location: 39.087587 N, 89.886597 W ZIP Codes (1990): 62033 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Dorchester, IL Dorchester