Illinois Route 1

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Illinois Route 1
IL 1 highlighted in red
Route information
Maintained by IDOT and CDOT
Length	323.06 mi[1] (519.91 km)
Existed	1918[2]–present
Major junctions
South end	KY 91 / Cave-in-Rock Ferry in Cave-in-Rock
Major intersections	US 45 in Norris City I-64 in Grayville US 50 in Lawrenceville I-70 in Marshall US 36 in Chrisman I-74 in Danville US 24 in Watseka US 30 / Lincoln Highway in Chicago Heights I-80 Toll / I-294 Toll in East Hazel Crest US 6 in Harvey
North end	I-57 in Chicago
Location
Country	United States
State	Illinois
Counties	Clark, Cook, Crawford, Edgar, Edwards, Gallatin, Hardin, Iroquois, Kankakee, Lawrence, Vermilion, Wabash, White, Will
Highway system
Illinois State Highway System Interstate US State Tollways Scenic
← I-490 → IL 2

Illinois Route 1 (IL 1) is a state highway in the U.S. state of Illinois. Running parallel to the Indiana border, the highway starts at the free ferry crossing to Kentucky at Cave-in-Rock on the Ohio River and runs north to the south side of Chicago as Halsted Street at an intersection with Interstate 57. This is a distance of 325.59 miles (523.99 km).^[1]