Illinois Route 78
IL 78 highlighted in red | ||||
| Route information | ||||
| Maintained by IDOT | ||||
| Length | 215.51 mi (346.83 km) | |||
| Existed | 1924–present | |||
| Major junctions | ||||
| South end | US 67 Bus. / IL 104 in Jacksonville | |||
| North end | WIS 78 in Warren | |||
| Location | ||||
| Country | United States | |||
| State | Illinois | |||
| Counties | Morgan, Cass, Mason, Fulton, Knox, Peoria, Stark, Henry, Whiteside, Carroll, Jo Daviess | |||
| Highway system | ||||
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Illinois Route 78 is a major north–south highway in western Illinois. It runs from Illinois Route 104 northwest of Jacksonville north to Highway 78 at the Wisconsin state line north of Warren. This is a distance of 215.51 miles (346.83 km).