| Illinois Route 78 | ||||
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| Route information | ||||
| Maintained by IDOT | ||||
| Length: | 215.51 mi (346.83 km) | |||
| Existed: | 1924 – present | |||
| Major junctions | ||||
| South end: |
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| North end: |
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| Location | ||||
| 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).
The following historic and geographic sites can be enjoyed on Illinois Route 78, southing from south to north: