Illinois Route 18
| North 13th Road | ||||
IL 18 highlighted in red | ||||
| Route information | ||||
| Maintained by IDOT | ||||
| Length | 39.01 mi (62.78 km) | |||
| Existed | 1939–present | |||
| Major junctions | ||||
| West end | IL 29 in Henry | |||
| I-39 / US 51 in Lostant | ||||
| East end | IL 17 in Blackstone | |||
| Location | ||||
| Country | United States | |||
| State | Illinois | |||
| Counties | Stark, Marshall, Putnam, LaSalle, Livingston | |||
| Highway system | ||||
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Illinois Route 18 (IL 18) is a rural east–west state route 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).