U.S. Route 51 in Illinois

U.S. Route 51
US 51 highlighted in red, former alignment in blue
Route information
Maintained by IDOT and ISTHA
Length	415.95 mi[1] (669.41 km) Length may include both directions of route where it is routed along one-way streets.
Existed	1926–present
Major junctions
South end	US 51 / US 60 / US 62 near Wickliffe, KY
Major intersections	I-57 / IL 3 near Cairo I-64 near Richview I-70 at Vandalia I-72 at Decatur I-55 / I-74 at Bloomington I-39 / I-55 at Normal I-80 at LaSalle I-88 Toll / IL 110 (CKC) at Rochelle I-90 Toll at Cherry Valley I-39 / I-90 at South Beloit
North end	US 51 at the Wisconsin state line in South Beloit
Location
Country	United States
State	Illinois
Counties	Alexander, Pulaski, Union, Jackson, Perry, Washington, Jefferson, Marion, Fayette, Shelby, Christian, Macon, DeWitt, McLean, Woodford, Marshall, LaSalle, Lee, Ogle, Winnebago
Highway system
United States Numbered Highway System List Special Divided Illinois State Highway System Interstate US State Tollways Scenic
← IL 50 → US 52

U.S. Route 51 (US 51) in the U.S. state of Illinois, is a main north–south artery that runs from the Ohio River north to the Wisconsin border, a distance of 415.95 miles (669.41 km).^[1]