List of Illinois Routes

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Standard Illinois Route shield
State: Illinois Route X (ILL X)
Interstates: Interstate X (I-X)
US Routes: U.S. Route X (US X)
Notes: Illinois Routes are generally state-maintained.
Illinois Route 72 cross-sign mounted on a stoplight in Hoffman Estates
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Illinois Route 72 cross-sign mounted on a stoplight in Hoffman Estates

The organized system of Illinois Routes (typically abbreviated as ILL), the state highway system for the U.S. state of Illinois, was created in 1918 with the first State Bond Issue (SBI) Routes, 1 thru 46. Bonds were floated to pay for specific routes. SBI # 1 paid for Route 1, and so on. These initial 47 route numbers marked the major infrastructure roads desired by the state legislature in 1918. Remarkably, many of these numbers still exist on the original or nearby alignment. As the highway system grew these numbers were altered to accommodate new roads or extensions of older roads.

In 1924, additional State Bond Issues were authorized for SBI Routes 47 thru 185. These route numbers were originally assigned and grouped to specific regions of the state. Thus, it is not uncommon to find groups of routes with similar numbers around each other (routes 23, 26, and 29 are found in north-central Illinois, while routes 56, 58, 59, 60, 62, 64, 68 and 72 are all be found in northern Chicagoland) and routes 100, 101, 103, 104, 105, 107 are found in western Illinois west of the Illinois River and largely south of McDonough County line.

SBI Route numbers that were superseded by other routes, US or state routes were often reused. For example, SBI Route 61 was originally assigned to a road segment in northeastern Illinois, but was reassigned to a route in western Illinois, sometime after 1937.

SBI Numbers are still used for several purposes, even when they do not match the posted number. IDOT District maps still refer to SBI numbers on the various roads it maintains, along with other non-posted designations that refer to how the route was authorized. Bridge weight plates refer to SBI numbers instead of posted route numbers as well. For example, bridge plates along old US-66 refer to the route as "SBI-4"

When the US Highway System of Interstate Roads started to be posted in 1926, the US numbers were just tacked onto the existing IL/SBI number unless the US route was routed along a new route.

Contents

[edit] Notes

  • There are a number of state routes which share numbers with Interstate routes in Illinois, i.e. Illinois Route 64 and Interstate 64. The Illinois Department of Transportation generally uses the rule that if the two routes cannot be confused, the state route will remain its number. Where confusion may occur, like Illinois Route 88 intersecting Interstate 88, the route number is changed. In the case of Illinois 88, it was renamed to Illinois Route 40.

[edit] List of Illinois Routes

Former routes are listed in italics.

[edit] 1-10

Route name Region Orientation Length
Miles Kilometers
Illinois Route 1 Eastern North-south 336 541
Illinois Route 2 Northwestern East-west 120 194
Illinois Route 3 Southwestern North-south 190 306
Illinois Route 4 Central North-south 160 257
Illinois Route 4A
Illinois Route 5 Northwestern East-west 20 32
Illinois Route 6 Central North-south 10.06 16.19
Illinois Route 7 Northeastern Southwest-northeast (marked north-south) 25 40
Illinois Route 8 Central East-west 60 97
Illinois Route 9 Central East-west 190 306
Illinois Route 10 Central East-west 91 146

[edit] 11-20

Route name Region Orientation Length
Miles Kilometers
Illinois Route 11
Illinois Route 12
Illinois Route 13 South central East-west 152 244
Illinois Route 14 South central East-west 81 130
Illinois Route 15 Southern East-west 144 232
Illinois Route 16 Central East-west 172 277
Illinois Route 17 North central East-west 203 327
Illinois Route 18 Central East-west 37 60
Illinois Route 19 Northeastern East-west 33.22 53.46
Illinois Route 20

[edit] 21-30

[edit] 31-40

[edit] 41-50

[edit] 51-60

[edit] 61-70A

[edit] 71-80

[edit] 81-90

[edit] 91-100

[edit] 101-110

[edit] 111-120

[edit] 121-130A

[edit] 131-140

[edit] 141-150

[edit] 151-160

[edit] 161-170

[edit] 171-180

[edit] 181-200

[edit] 201 and up

[edit] List of U.S. Routes in Illinois

[edit] Unnumbered routes

Some routes in Illinois are state maintained, but not numbered.

[edit] External links

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