Interstate 39 (I-39) is a highway in the Midwestern United States. I-39 runs from Normal, Illinois, at I-55 to State Trunk Highway 29 (WIS 29) in the town of Rib Mountain, Wisconsin, which is approximately six miles (9.7 km) south of Wausau. I-39 was designed to replace U.S. Route 51 (US 51), which, in the early 1980s, was one of the busiest two-lane highways in the United States. I-39 was built in the 1980s and 1990s.

Normal is a town in McLean County, Illinois, United States. As of the 2020 census, the town's population was 52,736. Normal is the smaller of two principal cities of the Bloomington–Normal metropolitan area, and is Illinois' seventh most populous community outside the Chicago metropolitan area. The main campus of Illinois' oldest public university, Illinois State University, a fully accredited four-year institution, is in Normal, as is Heartland Community College, a fully accredited two-year institution. Chris Koos has been Normal's mayor since 2003.