Colfax, IL -- U.S. village in Illinois Population (2000): 989 Housing Units (2000): 422 Land area (2000): 0.540621 sq. miles (1.400201 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.540621 sq. miles (1.400201 sq. km) FIPS code: 15495 Located within: Illinois (IL), FIPS 17 Location: 40.566290 N, 88.615304 W ZIP Codes (1990): 61728 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Colfax, IL Colfax