Route information | ||||
---|---|---|---|---|
Maintained by IDOT | ||||
Length | 215.51 mi[1] (346.83 km) | |||
Existed | 1924[3]–present | |||
Major junctions | ||||
South end | US 67 Bus. / IL 104 in Jacksonville[2] | |||
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 | ||||
|
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).[1]