Illinois Route 99 is a north–south state road in western 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 Illinois Route 104

Illinois Route 104

Illinois Route 104 is a state highway in central and western Illinois. It extends from Illinois Route 29 near Taylorville, west over the Illinois River at Meredosia to its western terminus in downtown Quincy. This is a distance of .- Route description :...

 across the Illinois River

Illinois River

The Illinois River is a principal tributary of the Mississippi River, approximately long, in the State of Illinois. The river drains a large section of central Illinois, with a drainage basin of . This river was important among Native Americans and early French traders as the principal water route...

 and Meredosia

Meredosia, Illinois

Meredosia is a village in Morgan County, Illinois, United States. The population was 1,041 at the 2000 census. It is part of the Jacksonville Micropolitan Statistical Area.-Geography:Meredosia is located at ....

, north to Illinois Route 101

Illinois Route 101

Illinois Route 101 is a east–west state road that runs from to the intersection of Illinois Route 61 in Augusta east to U.S. Highway 67 one mile east of Littleton. The highway was officially established in 1924 along its current alignment...

 in Brooklyn

Brooklyn, Schuyler County, Illinois

Brooklyn is an unincorporated community in Schuyler County, Illinois, United States. Brooklyn is located on Illinois Route 101 west of Littleton....

 (Schuyler County). This is a distance of 32.08 miles (51.63 km).

Route description

Illinois 99 runs northwest from Meredosia to Mount Sterling. It enters the Mount Sterling area on Pittsfield Road north of Illinois Route 107

Illinois Route 107

Illinois Route 107 is a north–south state highway in western Illinois. It runs from the northern terminus of U.S. Route 54 between Pittsfield and Griggsville north to Illinois Route 99 in Mt. Sterling. This is a distance of .- Route description :...

. It then overlaps U.S. Route 24

U.S. Route 24

U.S. Route 24 is one of the original United States highways of 1926. It originally ran from Pontiac, Michigan, in the east to Kansas City, Missouri, in the west. Today, the highway's eastern terminus is west of Clarkston, Michigan, at an intersection with I-75 and its western terminus is near...

 and runs west on Main Street. After about a half mile (.8 km), Illinois 99 then turns north on Cross Street, west on Washington Street, and then back north on Camden Road en route to Camden

Camden, Illinois

Camden is a village in Schuyler County, Illinois, United States. The population was 97 at the 2000 census.-Geography:Camden is located at .According to the United States Census Bureau, the village has a total area of , all of it land.-Demographics:...

 and Brooklyn.

History

SBI Route 99 had been a route from West Point

West Point, Illinois

West Point is a village in Hancock County, Illinois, United States. The population was 195 at the 2000 census.-Geography:West Point is located at .According to the United States Census Bureau, the village has a total area of , all of it land....

 to Tennessee

Tennessee, Illinois

Tennessee is a village in McDonough County, Illinois, United States. The population was 144 at the 2000 census.-Geography:Tennessee is located at ....

 on local roads, Illinois Route 91

Illinois Route 91

Illinois Route 91 is a rural state road in central Illinois. It runs from the northwest edge of Peoria at U.S. Highway 150 to U.S. Highway 34 south of Kewanee. Illinois 91 is long.- Route description :...

, Illinois Route 61

Illinois Route 61

Illinois Route 61 is a rural state road in western Illinois that runs north and east from Illinois Route 96 in Ursa to the intersection of U.S. Route 136 west of Tennessee. Illinois route 61 is long.-Route description:...

 and U.S. Route 136

U.S. Route 136

U.S. Highway 136 is a spur of U.S. Highway 36. It runs from Edison, Nebraska, at U.S. Highway 6 and U.S. Highway 34 to the Interstate 74/Interstate 465 interchange in Speedway, Indiana. This is a distance of 804 miles .-Nebraska:...

. In 1935 Illinois 99 was dropped from those routes. The next year, it replaced Illinois Route 104

Illinois Route 104

Illinois Route 104 is a state highway in central and western Illinois. It extends from Illinois Route 29 near Taylorville, west over the Illinois River at Meredosia to its western terminus in downtown Quincy. This is a distance of .- Route description :...

 on its current route; in 1941, Illinois 99 was extended north to Brooklyn.