U.S. Route 45 in Illinois

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U.S. Route 45
US 45 highlighted in red
Route information
Maintained by IDOT
Length	428.99 mi[1] (690.39 km)
Major junctions
South end	US 45 near Brookport
Major intersections	I-24 in Metropolis I-64 near Mill Shoals US 50 in Flora I-70 / US 40 in Effingham I-74 in Urbana I-57 in Kankakee US 30 in Frankfort I-80 in Tinley Park US 6 in Orland Park I-55 in Hodgkins
North end	US 45 near Antioch
Location
Country	United States
State	Illinois
Counties	Massac, Johnson, Williamson, Saline, Gallatin, White, Wayne, Clay, Effingham, Shelby, Cumberland, Coles, Douglas, Champaign, Ford, Iroquois, Kankakee, Will, Cook, Lake
Highway system
United States Numbered Highway System List Special Divided Illinois State Highway System Interstate US State Tollways Scenic
← IL 43 → IL 47
← IL 45 IL 46 → IL 47 ← US 51 IL 51 → US 52

U.S. Route 45 (US 45) in the state of Illinois is a major north–south U.S. Highway that runs from the Brookport Bridge over the Ohio River at Brookport north through rural sections of eastern Illinois and then through the suburbs of Chicago to the Wisconsin state line east of Antioch. This is a distance of 428.99 miles (690.39 km).^[1] US 45 is the longest numbered route in Illinois.