Illinois Route 109
| McClusky Road | ||||
IL 109 highlighted in red | ||||
| Route information | ||||
| Maintained by IDOT | ||||
| Length | 8.22 mi (13.23 km) | |||
| Major junctions | ||||
| South end | IL 3 in Dow | |||
| North end | US 67 in Jerseyville | |||
| Location | ||||
| Country | United States | |||
| State | Illinois | |||
| Counties | Jersey | |||
| Highway system | ||||
| ||||
Illinois Route 109 (IL 109) is a 8.22-mile-long (13.23 km) minor north–south state road in southwest Illinois. It runs from Illinois Route 3 east of Newbern north to U.S. Route 67 in Jerseyville.