Colfax is a village in McLean County, Illinois, United States. The population was 996 at the 2020 census. It is part of the Bloomington–Normal Metropolitan Statistical Area. Colfax is located in eastern McLean County at 40°33′59″N 88°36′55″W / 40.56639°N 88.61528°W. Illinois Route 165 runs along the northern border of the …Colfax is a village in McLean County, Illinois, United States. The population was 996 at the 2020 census. It is part of the Bloomington–Normal Metropolitan Statistical Area. Colfax is located in eastern McLean County at 40°33′59″N 88°36′55″W / 40.56639°N 88.61528°W. Illinois Route 165 runs along the northern border of the village, leading west-southwest 26 miles to Bloomington, the county seat, and east 13 miles to Sibley.