Colfax is a village in McLean County, Illinois, United States. The population was 1,061 at the 2010 census. It is part of the Bloomington–Normal Metropolitan Statistical Area.
The journalist and Northwestern University professor Elmo Scott Watson was born in Colfax in 1892.
Colfax is located at 40°33′59″N 88°36′55″W (40.566290, -88.615304).
According to the 2010 census, Colfax has a total area of 0.55 square miles (1.42 km2), all land.
Colfax was laid out on March 22, 1880 by James E. Wood (22 October 1818 – October 1908). Anderson was born in Indiana and had come to McLean County about 1855 as State Missionary for the Christian Church. He stayed and became a farmer, a banker, and a lifelong promoter of Colfax. To locals, Anderson was affectionately known as “Uncle Billy.” The northeastern townships of the county were among the last to be served by railroads. After many false starts the Clinton, Bloomington, and Northwestern Railroad began making its way westward from Kankakee, Illinois. It was aided by contributions in cash and land for the right-of-way by many local farmers.