U.S. Route 51 in Illinois

U.S. Route 51
U.S. Route 51
	US 51 highlighted in red, former alignment in blue
Route information
	Maintained by IDOT and ISTHA
Length	415.95 mi (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
	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;

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).