Illinois Route 18

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Illinois Route 18 marker

Illinois Route 18
Route information
Maintained by IDOT
Length: 39.01 mi[2] (62.78 km)
Existed: 1939[1] – present
Major junctions
West end: IL 29 in Henry
  I-39 / US 51 in Lostant
East end: IL 17 in Blackstone
Counties: Marshall, Putnam, LaSalle, Livingston
Highway system
IL 17 IL 19

Illinois Route 18 is a rural east–west state road in central Illinois. It runs east from the town of Henry at Illinois Route 29 to the town of Blackstone at Illinois Route 17. This is a distance of 39.01 miles (62.78 km).[2]

Route description[edit]

Illinois 18 crosses the Illinois River at Henry, and is the first river crossing south of Interstate 180. The terrain is generally flat outside of the Illinois River Valley area. In Streator, Illinois 18 westbound becomes Main Street. Eastbound, it becomes Bridge Street.


From 1918 through 1927, SBI Route 18 ran from Chicago to Princeton using modern U.S. Route 34. In 1939, it was applied to what was then SBI Route 17. The next year, the route was completed and Illinois 17 moved to a new highway south of Streator.[1]

Major intersections[edit]

County Location mi km Destinations Notes
Stark Henry IL 29 (University Street)
Illinois River Henry Bridge
Marshall IL 26 south West end of IL 26 overlap
Putnam IL 26 north East end of IL 26 overlap
Magnolia IL 89
La Salle I-39 / US 51 – Bloomington-Normal, Rockford
IL 251
Streator IL 23 (Bloomington Street, Park Street)
Livingston IL 17
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ a b Carlson, Rick. Illinois Highways Page: Routes 1 thru 20. Last updated March 15, 2005. Retrieved March 31, 2006.
  2. ^ a b Illinois Technology Transfer Center (2007). "T2 GIS Data". Retrieved 2007-11-08. 

External links[edit]

Route map: Bing / Google

KML is from Wikidata