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 | ![]() ![]() ![]() | |||
North end | ![]() | |||
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 | ||||
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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]
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