Illinois Route 91 is a rural state road in central Illinois

Illinois

Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...

. It runs from the northwest edge of Peoria

Peoria, Illinois

Peoria is the largest city on the Illinois River and the county seat of Peoria County, Illinois, in the United States. It is named after the Peoria tribe. As of the 2010 census, the city was the seventh-most populated in Illinois, with a population of 115,007, and is the third-most populated...

 at U.S. Highway 150 to U.S. Highway 34 south of Kewanee

Kewanee, Illinois

Kewanee is a city in Henry County, Illinois, United States. "Kewanee" is the Winnebago word for prairie chicken, which lekked there. The population was 12,916 at the 2010 census, down from 12,944 at the 2000 census.-Geography:...

. Illinois 91 is 40.72 miles (65.53 km) long.

Route description

Illinois 91 serves the cities of Toulon

Toulon, Illinois

Toulon is a city in Stark County, Illinois, United States. The population was 1,400 at the 2000 census. It is the county seat of Stark County. Toulon is part of the Peoria, Illinois Metropolitan Statistical Area, and is the northwestern terminus of the Rock Island Trail State Park.-Geography:Toulon...

, Wyoming

Wyoming, Illinois

Wyoming is a city in Stark County, Illinois, United States. The population was 1,424 at the 2000 census. It is the headquarters of the Rock Island Trail State Park. Wyoming is part of the Peoria, Illinois Metropolitan Statistical Area...

, Princeville

Princeville, Illinois

Princeville is a village in Peoria County, Illinois, United States. The population was 1,621 at the 2000 census. It is part of the Peoria, Illinois Metropolitan Statistical Area.-Geography:Princeville is located at ....

, and Dunlap

Dunlap, Illinois

Dunlap, located on Illinois 91, is a small village in Peoria County Illinois, United States. Its population was 926 people as of the 2000 census. Dunlap is part of the Peoria metropolitan area and growth in the city of Peoria is extending towards the village...

. It overlaps Illinois Route 90

Illinois Route 90

Illinois Route 90 is an east–west state highway in northern Peoria County in central Illinois. It runs from Illinois Route 78 in Laura to Illinois Route 40 in Edelstein. This is a distance of .- Route description :...

 around Princeville.

Illinois 91 does not run in a straight line between any two major towns. Illinois 91's endpoints are generally northwest-to-southeast, but the route consists entirely of north–south and east–west stretches.

History

SBI Route 91 was the current U.S. Route 150

U.S. Route 150

U.S. Route 150 is a 571 mile long northwest-southeast United States highway, signed as east–west. It runs from U.S. Route 6 outside of Moline, Illinois to U.S. Route 25 in Mount Vernon, Kentucky .-Illinois:In the state of Illinois, U.S. 150 runs from the Quad City International Airport at U.S...

 from Knoxville

Knoxville, Illinois

Knoxville is a city in Knox County, Illinois, United States. The population was 3,183 at the 2000 census. It is part of the Galesburg Micropolitan Statistical Area.-Description:Knoxville is located just southeast of the City of Galesburg...

 to Peoria. In 1941, the route number was moved to what was then Illinois Route 30, and has remained so to this day.