U.S. Route 14 in Illinois
| Ronald Reagan Highway | ||||
| US 14 highlighted in red | ||||
| Route information | ||||
| Maintained by IDOT and CDOT | ||||
| Length | 69.55 mi (111.93 km) | |||
| Existed | 1933–present | |||
| Major junctions | ||||
| West end | US 14 in Harvard | |||
| 
 | ||||
| East end | US 41 in Chicago | |||
| Location | ||||
| Country | United States | |||
| State | Illinois | |||
| Counties | McHenry, Lake, Cook | |||
| Highway system | ||||
| 
 | ||||
U.S. Route 14 (US 14) in the state of Illinois is a major arterial that runs southeast from the Wisconsin state line north of Harvard to the north side of Chicago at US 41.