List of state routes in Illinois

The Illinois Routes are the highways in the State Highway System of the U.S. state of Illinois that are not simultaneously part of the Interstate Highway System or the United States Numbered Highway System. These highways are maintained by the Illinois Department of Transportation (IDOT), with the exception of Illinois Route 390 and part of Illinois Route 56, which are maintained by the Illinois State Toll Highway Authority (ISTHA), and all routes that enter the Chicago City Limits are maintained by the Chicago Department of Transportation.

Illinois Routes
Standard Illinois route markers
System information
Maintained by IDOT, ISTHA, and CDOT
FormedNovember 5, 1918 (1918-11-05)[1]
Highway names
InterstatesInterstate X (I-X)
US HighwaysU.S. Route X (US X)
StateIllinois Route X (IL X)
System links
Illinois State Highway System

History

Illinois's state route numbers originated in 1918 as State Bond Issues 1 through 46, used to finance the new roads. The numbers of the bond issues were then used to mark the highway routes along the way. Another series of bond issues were authorized in 1924 (47–185) and again were used to mark the roads they paid for. After that the route numbers evolved into a separate system. The State Bond Issue numbers (SBI) remained as inventory designations on the original routes even after the numbered portion was changed, deleted or rerouted. These SBI numbers remain on IDOT district maps to this day and are used along with other designations for bid requests and other official documents.[2]

During the middle part of the 20th century the state numbered routes expanded to new roads around the state. When the United States Numbered Highway System was introduced in the late 1920s many of the new US Routes were already part of the state system and the US number was just added to signposts. During 1930s as the US Highway System matured, redundant state numbers were often removed from US Routes. During 1950s and into 1980s, as the Interstate Highway System started to supplant many US Routes, redundant numbers were removed or replaced with state numbers. After the original Interstate Highways were substantially completed in the early 1970s many state (and US) routes, especially in the Chicago metro area, were removed or shortened as unnecessary.[2]

While US and Interstate systems use even numbers for primary east–west routes and odd for north–south, there is no such rule for Illinois route numbers. Also, three-digit route numbers are usually not related to their one- or two-digit counterpart. There are several exceptions to this however.

General notes

Illinois has used route numbers from IL 1 through IL 186 inclusive[2] as well as many others up to IL 594.[3]

Illinois has used letter suffixes on several state highways, including "A", "B". "C", "N" (for north) and "S" (for south).[2] A, B and C suffixes were used for spurs of a nearby route, the N and S were legs of IL 113 on either side of the Kankakee River.[4]

Illinois has also used special routes, such as "Business", "Alternate", "City", "Bypass" and "Truck" on state-numbered highways. Only a pair of truck routes as well as a batch of Business Routes remain in Illinois, all other special state highways have been renumbered or the markers removed.[5]

Primary routes
Number Length (mi) Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
IL 1 323.06519.91 KY 91 in Cave in RockI-57 in Chicago 01918-01-011918current IL 1 was posted on what is now IL 394 from 1957 to 1964, the old road was Alt. IL 1 during that time
IL 2 73.91118.95 IL 40 in SterlingWIS 213 in South Beloit 01918-01-011918current Originally Rockford to Dixon to Mendota to Cairo; replaced by US 51 south of Mendota
IL 3 187.44301.66 US 51/IL 37 in CairoIL 100 in Grafton 01918-01-011918current Originally Morrison to Chester, replaced by other roads including IL 78 and US 67 north of the St. Louis area
IL 4 170.44274.30 IL 13/IL 127 in MurphysboroI-55 Bus./IL 29 in Springfield 01918-01-011918current Originally Chicago to St. Louis, mostly replaced by US 66 except from Springfield to Staunton where IL 4 was used on the old road and US 66 on the new; IL 4 replaced the old IL 43 Staunton to near Murphysboro
IL 4A —— —— 01925-01-01192501967-01-011967 Ran Chicago to Joliet along Archer Av., Replaced by IL 171
IL 5 —— —— 01918-01-01191801933-01-011933 Originally Chicago to East Dubuque, replaced mostly by US 20 except near Rockford until that was replaced later by Business US 20;
IL 5 15.7825.40 US 67 in Rock IslandI-80/I-88/IL 92/IL 110 (CKC) in East Moline 01971-01-011971current replaced IL 190 on the East–West Tollway until 1987 when it was replaced by I-88 east of I-80
IL 6 —— —— 01918-01-01191801933-01-011933 Originally Chicago to Fulton, replaced by US 30, later to become Alt. US 30 and now IL 38
IL 6 10.1116.27 I-74/I-474 in PeoriaIL 29 in Mossville 01971-01-01c. 1971current applied to freeway extension of I-474 around 1982
IL 7 28.0645.16 US 6 in RockdaleIL 43 in Worth 01918-01-011918current Originally Chicago to East Moline, replaced west of Orland Park by US 6 about 1928 then extended to Rockdale in 1969
IL 8 45.5173.24 IL 97 in MaquonUS 24 in Washington 01918-01-011918current Originally Gulfport to Sheldon, removed in parts and replaced by US 34, US 24 and other routes
IL 9 218.31351.34 Iowa 2 in NiotaSR 26/SR 352 in Hoopeston 01918-01-011918current Originally Hamilton to Cheneyville, replaced in part by US 136, IL 41 and IL 9
IL 10 91.35147.01 US 136 in EastonUS 150 in Champaign 01918-01-011918current Originally Jacksonville to Decatur, later extended to Danville and Havana
IL 11 —— —— 01918-01-01191801933-01-011933 Originally Terre Haute to St. Louis, replaced by US 40
IL 11 —— —— 01945-01-01194501948-01-011948 replaced by US 40 alternate, and now IL-140
IL 12 —— —— 01918-01-01191801933-01-011933 Originally Vincennes, IN to St. Louis, replaced by US 50
IL 13 151.54243.88 IL 157/IL 163 in CentrevilleKY 56 in Old Shawneetown 01918-01-011918current Originally Old Shawneetown to St. Louis
IL 14 76.24122.70 US 51 in Du QuoinSR 66 in Phillipstown 01918-01-011918current Originally DuQuoin to Carmi
IL 15 149.64240.82 I-55/I-64/US 40/IL 3 in East St. LouisSR 64 in Mt. Carmel 01918-01-011918current Originally East St. Louis to Albion
IL 16 174.66281.09 IL 100 in HardinUS 150/IL 1/IL 133 in Paris 01918-01-011918current Originally Paris to Litchfield, later extended west to Hardin; IL 316 replaced IL 16 after a new road was built from Mattoon to Charleston in 1962
IL 17 209.4337.0 1st Street in New BostonSR 2 in Grant Park 01918-01-011918current Originally Lacon to Grant Park. Ferry at New Boston dropped in 1973
IL 18 —— —— 01918-01-01191801933-01-011933 Originally Princeton to Chicago (Ogden Av.)
IL 18 39.0162.78 IL 29 in HenryIL 17 in Blackstone 01939-01-011939current Replaced IL 89B and 89C
IL 19 —— —— 01918-01-01191801933-01-011933 Originally Chicago to Harvard on what is now US-14
IL 19 33.6454.14 IL 25 in ElginUS 41 in Chicago 01949-01-011949current moved to current route in 1949
IL 20 —— —— 01919-01-01191901941-01-011941 Replaced in 1941 by IL 120 after confusion with the nearby US-20
IL 21 28.1345.27 IL 43 in NilesUS 41 in Gurnee 01918-01-011918current This is Milwaukee Ave. Originally Antioch to Chicago.
IL 22 19.731.7 US 14 in Fox River GroveUS 41 in Highland Park 01918-01-011918current Originally the "22 Loop" around the Chicago metro area. It followed the current IL-22, then went to Crystal Lake via US-14, Aurora via IL-31 and Lynwood on US-30.
IL 22A —— —— 01924-01-01192401925-01-011925 Became part of IL 63, which was deleted in 1973; Now IL 68
IL 23 126.17203.05 IL 116 in PontiacUS 14 in Harvard 01918-01-011918current Part of it (Streator to Pontiac) was once IL 118
IL 24 —— —— 01918-01-01191801940-01-011940 Replaced by IL 29 by 1940
IL 25 —— —— 01918-01-01191801933-01-011933 Kankakee to Fairfield, replaced by US-45.
IL 25 35.0456.39 US 34 in OswegoIL 62 in Carpentersville 01934-01-011934current Reused in the 1930s on current route.
IL 26 139.35224.26 IL 116 in East PeoriaWIS 69 in Orangeville 01918-01-011918current Originally Freeport to Polo, extended north to the state line to replace IL-74 and south to Bureau then E. Peoria replacing IL-89 and IL-87 in part. Rerouted to the I-180 bridge in the 1990s due to a bridge removal over the Illinois River
IL 27 —— —— 01918-01-01191801934-01-011934 Was Savanna to Polo, Now part of US 52
IL 28 —— —— 01918-01-01191801933-01-011933 Was Sheffield to Galesburg, Now part of US 34
IL 29 175.36282.21 US 51/IL 16 in PanaUS 6/IL 89 in Spring Valley 01918-01-011918current Originally DePue to Peoria, extended in the 1930s and 40s.
IL 30 —— —— 01918-01-01191801941-01-011941 Was Peoria to Galva, Replaced by US-150, IL-17, IL-78, US-34 and IL 91
IL 31 —— —— 01918-01-01191801933-01-011933 Was Quincy to Canton, replaced by US-24, IL-78 and IL-100.
IL 31 58.4194.00 US 34 in OswegoUS 12 in Richmond 01937-01-011937current Current route marked in 1937.
IL 32 69.32111.56 US 40/IL 33 in EffinghamIL 48 in Cisco 01918-01-011918current Originally Decatur to Windsor, extended to Effingham in 1936 then to Cisco in 1998.
IL 33 97.17156.38 IL 128 in Beecher CityUS 50 in Lawrenceville 01918-01-011918current Originally Effingham to Gordon, extended to current route in stages.
IL 34 61.7499.36 Hopkinton Street / Walnut Street in RosiclareIL 14/IL 37 in Benton 01918-01-011918current Originally was a "T" Shaped route from Harrisburg to Elizabethtown and a leg south to Golconda and a ferry went to KY-297 across the Ohio River. Extended to Benton and to Rosiclare in 1937. Part of this is now IL-146.
IL 35 —— —— 01918-01-01191801933-01-011933 Used from Mound City to US-51, barely 1 mile long, to serve a federal cemetery. This is now part of IL-37 (part of IL-147 for a short time).
IL 35 2.423.89 US 20 in East DubuqueWIS 35 in East Dubuque 01938-01-011938current Used from E. Dubuque to the WI State Line, replacing IL-79.
IL 36 —— —— 01918-01-01191801937-01-011937 Replaced by IL 94
IL 37 155.07249.56 US 51 in CairoUS 45 in Watson 01918-01-011918current
IL 38 —— —— 01918-01-01191801941-01-011941 Replaced by IL 16, IL 159 (then IL 112, and IL 138
IL 38 89.28143.68 US 52 in DixonUS 12/US 20/US 45 in Westchester 01971-01-011971current
IL 39 —— —— 01918-01-01191801933-01-011933 Now part of US 150
IL 40 —— —— 01918-01-01191801938-01-011938 became part of IL 88
IL 40 112.05180.33 I-74/IL 29 in East PeoriaIL 78 in Mount Carroll 01995-01-011995current Formerly IL 88
IL 41 37.5360.40 US 136 in AdairUS 34/IL 110 (CKC)/IL 164 in Galesburg 01918-01-011918current
IL 42 —— —— 01918-01-01191801972-01-011972 Ran from Chicago to Winthrop Harbor, part of it is now IL-173. Was the designation of Sheridan Road
IL 42A —— —— 01925-01-01192501967-01-011967 Replaced by IL 43
IL 43 —— —— 01918-01-01191801933-01-011933 Replaced by IL-120 and IL-122.
IL 43 —— —— 01935-01-01193501963-01-011963 Former IL-150 and IL-151; replaced by IL-4.
IL 43 60.397.0 US 30 in FrankfortUS 41/IL 120 in Park City 01967-01-011967current Formerly IL 42A
IL 44 —— —— 01918-01-01191801940-01-011940 Now part of US 52
IL 45 —— —— 01918-01-01191801934-01-011934 Became IL 179 in 1936; IL 179 was deleted by 1995
IL 46 —— —— 01918-01-01191801938-01-011938 Became in part US 45 from La Grange to Des Plaines[6]
IL 47 169.76273.20 IL 10 in SeymourWIS 120 in Hebron 01924-01-011924current
IL 48 85.38137.41 IL 127 in RaymondIL 54 in DeWitt 01924-01-011924current
IL 49 140.86226.69 IL 33 in Willow HillUS 45/US 52 in Ashkum 01924-01-011924current Originally Willow Hill (Near Jasper) to Chicago
IL 50 66.49107.01 US 45/US 52 in KankakeeUS 41 in Skokie 01924-01-011924current
IL 51 —— —— 01924-01-01192401933-01-011933 Now part of US 45
IL 52 —— —— 01924-01-01192401938-01-011938 Replaced by IL 83; Originally Lemont to Lynwood
IL 53 82.02132.00 Main Street in GardnerIL 83 in Long Grove 01924-01-011924current
IL 54 —— —— 01924-01-01192401941-01-011941 Replaced by IL 83; Originally Lemont to Lynwood
IL 54 109.35175.98 I-55 in SpringfieldUS 45 in Onarga 01972-01-011972current Formerly US 54; Originally Antioch to Lemont
IL 55 —— —— 01924-01-01192401964-01-011964 Now IL 56; Originally Chicago to Oak Brook
IL 56 32.5252.34 US 30/IL 47 in Sugar GroveUS 12/US 20/US 45 in Bellwood 01924-01-011924current
IL 57 —— —— 01924-01-01192401933-01-011933 Replaced by US 41 and IL-50
IL 57 12.5920.26 I-172/IL 110 (CKC) in Fall CreekUS 24/IL 104 in Quincy 01949-01-011949current
IL 58 28.345.5 IL 25 in ElginUS 41 in Skokie 01924-01-011924current
IL 59 71.13114.47 I-55 in ShorewoodIL 173 in Antioch 01924-01-011924current
IL 59A —— —— —— Replaced by IL 60
IL 60 —— —— 01924-01-01192401937-01-011937 Replaced by US 12
IL 60 17.2227.71 IL 120 in VoloUS 41 in Lake Forest 01967-01-011967current Formerly IL 59A
IL 61 —— —— 01924-01-01192401933-01-011933 Richmond to Crystal Lake; now IL 31 (then part of US 12)
IL 61 44.7772.05 IL 96 in UrsaUS 136/IL 110/IL 336 in Tennessee 01935-01-011935current
IL 62 20.8233.51 IL 31 in AlgonquinIL 83 in Des Plaines 01924-01-011924current Originally Algonquin to Chicago (Harlem Ave.) on Algonquin Road west of Des Plaines. In Des Plaines, this was on Oakton Street and then in Park Ridge, it was Talcott Road into Chicago. IL 62 originally ended at IL 43 (Harlem Ave.) In 1974, IL 62 was removed east of IL 83 in Des Plaines.[7]
IL 63 —— —— 01924-01-01192401973-01-011973 Replaced in part by IL 21, IL 59, and IL 68
IL 64 136219 US 52/Iowa 64 in SavannaUS 41 in Chicago 01924-01-011924current
IL 65 —— —— 01924-01-01192401971-01-011971[8] Swapped routes with US 34
IL 66 —— —— 01924-01-01192401933-01-011933 Now IL 126
IL 67 —— —— 01924-01-01192401940-01-011940 Replaced in part by IL 176
IL 68 —— —— 01924-01-01192401937-01-011937 Now IL 131
IL 68 25.7441.42 IL 72 in East DundeeI-94/US 41 in Glencoe 01942-01-011942current Originally Lake Bluff to Russell
IL 69 —— —— 01924-01-01192401940-01-011940 Now part of US 52
IL 70 19.0130.59 IL 75 in DurandUS 20 Bus. in Rockford 01924-01-011924current Originally Durand to Mendota
IL 70A —— —— 01924-01-01192401938-01-011938 Replaced by IL 170 (then IL 186)
IL 71 69.37111.64 I-180/IL 29 in HennepinUS 34 in Oswego 01938-01-011938current Former IL 7A and IL 89A
IL 72 110.71178.17 IL 73 in LanarkIL 43 in Chicago 01924-01-011924current Originally Lanark to Starks
IL 73 29.3247.19 US 52/IL 64 in LanarkWisconsin state line near Winslow 01924-01-011924current
IL 74 —— —— 01924-01-01192401937-01-011937 Replaced in part by IL 26
IL 75 41.6467.01 IL 26 in FreeportWIS 67 in South Beloit 01924-01-011924current
IL 76 15.6725.22 Business US 20 in BelvidereWIS 140 east of South Beloit 01924-01-011924current
IL 77 —— —— 01924-01-01192401936-01-011936 Replaced by IL 64
IL 77 —— —— 01936-01-01193601937-01-011937 Replaced by US 40 Bypass
IL 78 215.51346.83 US 67/Business US 67/IL 104 in JacksonvilleWIS 78 near Warren 01924-01-011924current
IL 79 35 East DubuqueWI State Line 01918-01-01191801938-01-011938 Replaced by IL 35
IL 79 —— Mississippi RiverFall Creek 01967-01-01196701981-01-011981 Replaced by IL 336
IL 80 —— —— —01964-01-011964 Now part of US 150 and IL 84
IL 81 25.7841.49 US 150 in Lynn CenterIL 78 in Kewanee 01924-01-011924current
IL 82 28.8446.41 IL 17 in Bishop HillIL 92 north of Geneseo 01924-01-011924current
IL 83 —— —— 01924-01-01192401940-01-011940 Now part of IL 17
IL 83 92.22148.41 US 30 in LynwoodWIS 83 north of Antioch 01941-01-011941current Originally Galva to New Boston on what is now IL 17
IL 83A —— —— 01924-01-01192401940-01-011940 Now unnumbered
IL 84 93.93151.17 —— 01924-01-01192401937-01-011937 Replaced by IL 2; now IL 92
IL 84 93.93151.17 US 6 in ColonaWIS 80 near Galena 01955-01-011955current
IL 85 —— —— 01924-01-01192401933-01-011933 Now part of US 67
IL 86 —— —— 01924-01-01192401937-01-011937 Now IL 2
IL 87 —— —— 01924-01-01192401935-01-011935 unbuilt spur to Dixon
IL 87 —— —— 01941-01-01194101969-01-011969 Now IL 26
IL 88 —— —— 01924-01-01192401995-01-011995 Replaced the original IL 40 in 1938; now IL 40
IL 88A —— —— —01938-01-011938 Replaced partly by IL 17
IL 89 55.4889.29 IL 116 in MetamoraUS 34 in LaMoille 01924-01-011924current
IL 89A —— —— 01924-01-01192401938-01-011938 Now part of IL 71
IL 89B —— —— 01924-01-01192401939-01-011939 Now part of IL 18
IL 89C —— —— 01924-01-01192401939-01-011939 Now part of IL 18
IL 90 15.825.4 IL 78 near LauraIL 40 near Edelstein 01924-01-011924current
IL 91 —— —— 01924-01-01192401934-01-011934 Replaced by US 150
IL 91 40.7265.53 US 150 in PeoriaUS 34/IL 78 in Kewanee 01939-01-011939current formerly IL 30
IL 92 106.41171.25 Iowa 92 near Muscatine, IowaUS 34 in LaMoille 01939-01-011939current
IL 93 9.615.4 IL 91 in ElmiraIL 40 in Bradford 01924-01-011924current
IL 94 128.76207.22 US 24 in Camp PointUS 67 in Oak Grove 01924-01-011924current
IL 94A —— —— 01924-01-01192401937-01-011937 Now IL 164
IL 94B —— —— 01924-01-01192401937-01-011937 Now IL 135
IL 95 17.1227.55 IL 41 in BardolphIL 97 in Cuba 01924-01-011924current
IL 95A —— —— 01924-01-01192401937-01-011937 Now IL 94
IL 96 141.16227.17 IL 100 in KampsvilleIL 94 in Lomax 01924-01-011924current
IL 97 —— —— 01924-01-01192401933-01-011933 replaced by US 124; now IL 116
IL 97 104.43168.06 I-55/I-72/US 36 in SpringfieldUS 150 in Knoxville 01938-01-011938current
IL 97A —— —— —01937-01-011937 Now IL 116
IL 98 —— —— 01924-01-01192401937-01-011937 replaced by IL 10
IL 98 8.3613.45 IL 29 in PekinI-155 in Morton 01939-01-011939current
IL 99 —— —— 01924-01-01192401935-01-011935 replaced by IL 94 and IL 61
IL 99 32.0851.63 IL 104 in ChambersburgIL 101 in Brooklyn, Schuyler County 01936-01-011936current
IL 100 159.09256.03 US 67 in AltonIL 78 in Dunfermline 01924-01-011924current
IL 101 19.4331.27 IL 61 in AugustaUS 67 in Littleton 01924-01-011924current
IL 102 18.3329.50 —— 01924-01-01192401955-01-011955 Chatton to Camp Point; now IL 94 and IL 61
IL 102 18.3329.50 US 45/US 52 in BourbonnaisIL 53 in Wilmington, Will County 01961-01-011961current formerly IL 113N
IL 103 9.1814.77 US 24 near RipleyUS 67/IL 100 near Beardstown 01924-01-011924current
IL 104 125.91202.63 US 24/IL 57 in QuincyIL 29 in Taylorville 01924-01-011924current
IL 105 18.3329.50 —— 01924-01-01192401937-01-011937 Meredosia to Quincy; now IL 104
IL 105 37.5860.48 IL 48 in DecaturI-72 in Monticello 01945-01-011945current
IL 106 18.3329.50 —— 01924-01-01192401933-01-011933 Winchester to Whitehall; became US 36; now 106 again
IL 106 66.47106.97 I-72/US 36/IL 110 (CKC) in HullUS 67 in White Hall 01938-01-011938current
IL 107 23.1437.24 I-72/US 36/US 54 in PittsfieldIL 99 in Mt. Sterling 01924-01-011924current
IL 108 54.0687.00 IL 100 in KampsvilleI-55 in Raymond 01924-01-011924current
IL 109 8.2213.23 IL 3 in DowUS 67 in Jerseyville 01924-01-011924current
IL 110 —— —— 01924-01-01192401938-01-011938 Jerseyville to Benld
IL 110 —— —— 01938-01-01193801949-01-011949 Nashville to Freeburg; became US 460
IL 110 328528 I-72/US 36/MO 110 near Hannibal, MissouriI-90/I-94/I-290 in Chicago 02010-01-012010current Chicago-Kansas City Expressway; Originally Jerseyville to Benld
IL 111 82.18132.26 Lake Drive in CentrevilleIL 104 in Waverly 01924-01-011924current
IL 112 —— —— 01924-01-01192401964-01-011964 Now IL 159; Originally Royal Lakes to Edwardsville
IL 113 33.9554.64 IL 47 in MazonIL 17 in Kankakee 01924-01-011924current
IL 113N —— —— 01940-01-01194001961-01-011961 Now IL 102
IL 113S —— —— 01940-01-01194001961-01-011961 Now IL 113
IL 114 7.411.9 IL 1/IL 17 in MomenceSR 10 near Lake Village, Indiana 01924-01-011924current
IL 115 63.37101.98 IL 9 in ElliottUS 45/US 52 in Kankakee 01924-01-011924current
IL 116 176.07283.36 US 34/IL 94 in GladstoneUS 45 in Ashkum 01924-01-011924current
IL 116A —— —— 01924-01-01192401994-01-011994 Replaced by IL 117
IL 117 33.8554.48 I-74 in GoodfieldIL 17 in Toluca 01924-01-011924current
IL 118 —— —— 01924-01-01192401933-01-011933 Originally Streator to Pontiac on what is now IL 23
IL 118 —— —— 01935-01-01193501938-01-011938 Replaced by DuPage CH 7
IL 119 7.7812.52 US 136/IL 1 west of AlvinSR 28 east of Alvin 01924-01-011924current Originally Heyworth to the Indiana Line north of Danville
IL 119A —— —— 01924-01-01192401937-01-011937
IL 120 —— —— 01924-01-01192401937-01-011937 Havana to Mason City on what is now IL 119
IL 120 34.4855.49 US 14 in WoodstockIL 131 in Waukegan 01941-01-011941current Formerly IL 20
IL 121 109.48176.19 IL 130 in GreenupI-55/IL 10 in Lincoln 01924-01-011924current Originally Peoria to Decatur, then to the Indiana line, near Chrisman
IL 122 31.5350.74 IL 29 in Green ValleyIL 9 in Danvers 01924-01-011924current Originally Bloomington to Havana
IL 123 33.7254.27 IL 125 in Pleasant PlainsI-55 in Williamsville 01924-01-011924current Originally Alexander to Athens
IL 124 5.719.19 IL 123 in WilliamsvilleBusiness I-55 in Sherman 01924-01-011924current Originally Athens to Springfield on what is now IL 29
IL 125 37.159.7 US 67/IL 100 in BeardstownIL 97 in Pleasant Plains 01924-01-011924current Originally Springfield to Virginia
IL 126 —— —— 01924-01-01192401932-01-011932 Springfield to Litchfield; became US 66
IL 126 17.2527.76 IL 47 in YorkvilleI-55 in Plainfield 01935-01-011935current Formerly IL 66; Originally Springfield to Litchfield
IL 127 167.53269.61 IL 3 in UnityI-55/IL 48 in Raymond 01924-01-011924current
IL 127A —— —— 01924-01-01192401937-01-011937 Now IL 143
IL 128 55.5789.43 I-70 in AltamontIL 121 in Dalton City 01924-01-011924current
IL 128A —— —— —01938-01-011938
IL 129 —— —— 01924-01-01192401936-01-011936 Effingham to Windsor; now IL 32
IL 129 4.066.53 IL 113 in BraidwoodI-55 north of Braidwood 01960-01-011960current Washington Street; Originally Effingham to Windsor on what is now IL 32
IL 130 135.87218.66 IL 1 in GrayvilleI-74 in Urbana 01924-01-011924current Originally Charleston to Albion
IL 130A 58 —— 01930-01-01193001942-01-011942[9] Newton to Sainte Marie
IL 131 —— —— 01924-01-01192401937-01-011937 Mattoon to Greenup; now IL 121
IL 131 15.1524.38 IL 176 in Lake BluffWIS 31 near Pleasant Prairie, Wisconsin 01938-01-011938current Green Bay Road
IL 132 —— —— 01924-01-01192401937-01-011937 Decatur to Mattoon; now IL 121
IL 132 13.5721.84 IL 59 in Fox Lake HillsIL 131 in Waukegan 01950-01-011950current Grand Avenue
IL 133 52.0583.77 IL 32 in LovingtonUS 150/IL 1/IL 16 in Paris 01924-01-011924current
IL 134 —— —— 01924-01-01192401933-01-011933 Paris to Indiana; now US 150
IL 134 5.629.04 US 12/IL 59 in Fox LakeIL 120 in Hainesville 01950-01-011950current
IL 135 —— —— 01924-01-01192401935-01-011935 IL-1 to the Wabash River bridge at Hutsonville
IL 135 20.3132.69 IL 164 in KirkwoodUS 67 in Alexis 01937-01-011937current
IL 136 —— —— 01924-01-01192401935-01-011935 IL-1 to Flat Rock
IL 136 3.225.18 Iowa 136 in FultonUS 30 east of Fulton 01967-01-011967current
IL 137 —— —— 01924-01-01192401935-01-011935 IL-1 to St. Francisville
IL 137 23.4937.80 IL 83 in GrayslakeWIS 32 in Winthrop Harbor 01953-01-011953current
IL 138 —— —— 01924-01-01192401937-01-011937 Mt. Carmel to Grayville; replaced by IL-1
IL 138 14.9524.06 IL 159 in Bunker HillIllinois Street in Mt. Olive 01942-01-011942current Originally Mt. Carmel to Grayville
IL 139 —— —— 01924-01-01192401937-01-011937 Now IL 14; Originally Caramelville to Wabash River Bridge
IL 140 —— —— 01924-01-01192401937-01-011937 Fairfield to Cave in Rock; replaced by IL-1
IL 140 52.0583.77 IL 143 in AltonUS 40 near Mulberry Grove 01935-01-011935current Originally Fairfield to Cave in Rock
IL 141 18.1729.24 US 45 north of Texas CitySR 62 east of New Haven 01924-01-011924current
IL 142 55.0688.61 Calhoun Street in EqualityI-57 in Mt. Vernon 01924-01-011924current
IL 142A —— —— 01924-01-01192401942-01-011942 Now IL 242; replaced by IL-147
IL 143 —— —— 01924-01-01192401937-01-011937 Benton to Harrisburg; replaced by IL-34
IL 143 47.9677.18 US 67 in AltonIL 127 in Tamalco 01937-01-011937current Originally Benton to Harrisburg
IL 144 —— —— 01924-01-01192401964-01-011964 Now IL 149; Originally Grimsby to Murphysboro
IL 145 43.4769.96 US 45 in MetropolisUS 45/IL 34 in Harrisburg 01924-01-011924current
IL 146 92.93149.56 MO 34/MO 74 in East Cape GirardeauIL 1 in Cave-In-Rock 01924-01-011924current
IL 147 —— —— 01924-01-01192401934-01-011934 Marion to Cairo; now IL 37
IL 147 —— —— 01942-01-01194201946-01-011946 McLeansboro to Wayne City; replaced by IL 142, now IL 242
IL 147 12.8120.62 IL 146 in ViennaIL 145 in Eddyville 01965-01-011965current Originally Marion to Cairo on now what IL 37
IL 148 54.8588.27 IL 37 in Pulleys MillIL 37/IL 142 in Mt. Vernon 01924-01-011924current
IL 149 45.9273.90 IL 3 in GorhamIL 34 in Thompsonville 01924-01-011924current Formerly IL 144
IL 150 24.1938.93 MO 51 in ChesterIL 154 in Cutler 01924-01-011924current Originally Cairo to Harmel
IL 151 7.8412.62 —— 01924-01-01192401937-01-011937 replaced by Illinois 43; now Illinois 4
IL 151 7.8412.62 IL 3 in JacobIL 4 in Ava 01940-01-011940current Originally Steeleville to Murphysboro
IL 152 6.7610.88 IL 13/IL 127 in PyattsUS 51 in Du Quoin 01924-01-011924current
IL 153 18.3529.53 IL 154 in SpartaIL 15 in Addieville 01924-01-011924current Originally Eden to Irvington
IL 154 63.63102.40 IL 3/IL 159 in Red BudIL 37 in Whittington 01924-01-011924current Originally Pinkeyville to Sunfield
IL 155 10.8117.40 Fort de Chartres State Historical SiteIL 3 in Ruma 01924-01-011924current
IL 156 22.9536.93 South Meyer Avenue/C Road in ValmeyerIL 13 in New Athens 01924-01-011924current
IL 157 33.5053.91 IL 3 in CahokiaIL 140 in Hamel 01924-01-011924current
IL 158 25.8141.54 IL 3 in ColumbiaI-64/US 50 in O'Fallon 01924-01-011924current
IL 159 64.90104.45 IL 3/IL 154 in Red BudIL 16 in Royal Lakes 01924-01-011924current
IL 160 —— —— 01924-01-01192401935-01-011935 Alton to Greenville; renumbered IL 140
IL 160 46.0674.13 IL 15 in AddievilleIL 140 in Alhambra 01959-01-011959current
IL 161 67.24108.21 St. Clair Avenue in Fairview HeightsIL 37 in Kell 01924-01-011924current Originally Carlyle to Belleville
IL 162 —— —— 01924-01-01192401938-01-011938 Spring Valley to LaMoille; replaced by IL 89
IL 162 16.3626.33 IL 203 in Granite CityUS 40 in Troy 01954-01-011954current
IL 163 —— —— 01924-01-01192401937-01-011937 IL 1 to Palestine; replaced by IL 33
IL 163 9.8915.92 IL 158 in MillstadtIL 15 in Alorton 01954-01-011954current
IL 164 —— —— 01924-01-01192401937-01-011937 Pekin to west of Bloomington; replaced by IL 9
IL 164 35.7057.45 US 34 in GladstoneUS 34/IL 41/IL 110 (CKC) in Galesburg 01937-01-011937current
IL 165 29.6447.70 IL 9 in MernaIL 47 in Sibley 01924-01-011924current
IL 166 14.4323.22 US 45 in New BurnsideIL 13 in Pittsburg 01924-01-011924current
IL 167 12.2419.70 US 34 in WatagaIL 180 in Victoria 01924-01-011924current
IL 168 —— —— 01924-01-01192401941-01-011941 Now IL 97
IL 169 —— —— 01924-01-01192401939-01-011939 Shelbyville to Dalton City; replaced by IL 128
IL 169 9.0414.55 IL 37 in KarnakUS 45 in New Columbia 01949-01-011949current
IL 170 —— —— 01924-01-01192401937-01-011937 Red Bud to Sparta; replaced by IL 154
IL 170 2540 IL 23 in CornellUS 6 in Seneca 01945-01-011945current Formerly IL 70A and IL 186
IL 171 —— —— 01924-01-01192401936-01-011936 Thomson to IL 78
IL 171 38.6162.14 US 6 in JolietIL 72 in Chicago 01946-01-011946current Formerly IL 4A and IL 213
IL 172 —— —— 01924-01-01192401936-01-011936 Libertyville to Gurnee; replaced by IL 63 and now is part of IL 21
IL 172 13.0621.02 IL 92 in YorktownIL 40 in Tampico 01946-01-011946current Originally Libertyville to Gurnee
IL 173 66.20106.54 IL 251 in Machesney ParkIL 137 in Zion 01924-01-011924current
IL 174 5.38.5 IL 88 in PeoriaIL 91 west of Alta 01924-01-01192401983-01-011983
IL 175 23 US 24/IL 9 near GlasfordGlasford 01924-01-01192401935-01-011935
IL 176 41.2866.43 IL 23 in MarengoIL 131 in Lake Bluff 01924-01-011924current Formerly IL 67
IL 177 47.5976.59 IL 13/IL 158/IL 159 in BellevilleUS 51 in Irvington 01924-01-011924current
IL 178 8.4913.66 Ed Lambert Road in LowellI-80 in North Utica 01924-01-011924current
IL 179 16.326.2 IL 251 near RutlandIL 18 near Streator 01924-01-01192401995-01-011995 Part originally IL 45
IL 180 15.4324.83 US 150 in WilliamsfieldIL 17 in Victoria 01924-01-011924current
IL 181 —— —— 01924-01-01192401948-01-011948 Now IL 33
IL 182 —— —— 01924-01-01192401941-01-011941 Now IL 161
IL 183 —— —— 01924-01-01192401984-01-011984 Now IL 154
IL 184 5.879.45 IL 149 in RoyaltonIL 14 in Mulkeytown 01924-01-011924current
IL 185 49.8880.27 IL 127 in Taylor SpringsIL 37 in Farina 01924-01-011924current
IL 186 —— —— 01938-01-01193801945-01-011945 Now IL 170
IL 190 —— —— 01966-01-01196601971-01-011971 renumbered IL 5; now I-88
IL 192 8.3113.37 IL 92 in Illinois CityIL 94 in Taylor Ridge 01955-01-011955current
IL 194 —— —— 01960-01-01196001978-01-011978 Now I-90/I-94 in Chicago
IL 199 —— —— 01969-01-01196901980-01-011980 Now IL 92
IL 203 9.5115.30 Collinsville Road in Fairmont CityI-270 in Granite City 01964-01-011964current
IL 213 —— —— —01946-01-011946 Now IL 171
IL 226 —— —— —01946-01-011946 Replaced by IL 172
IL 242 18.6730.05 IL 142 in McLeansboroIL 15 in Wayne City 01924-01-011924current Formerly IL 142A
IL 250 33.4453.82 US 50 in NobleBusiness US 50 in Lawrenceville 01965-01-011965current
IL 251 135.32217.78 I-39/US 51 in HudsonUS 51/IL 75 in South Beloit 01982-01-011982current
IL 255 23.337.5 I-255/I-270 in Pontoon BeachUS 67 in Godfrey 01998-01-011998current
IL 267 5995 US 67/IL 111 in GodfreyBusiness I-72/Business US 67/IL 104 in Jacksonville 01965-01-011965current
IL 316 —— —— —01981-01-011981 Now part of IL 16
IL 336 80129 I-172/US 24/IL 110 (CKC) in QuincyUS 136/IL 110 (CKC) in Macomb 01990-01-011990current
IL 351 8.5513.76 IL 71/IL 251 in OglesbyI-80 in LaSalle 01966-01-011966current

IL 390		 9.8015.77 US 20 in Hanover ParkIL 83 in Bensenville 02013-01-012013current Formerly the Elgin–O'Hare Expressway
IL 394 14.6323.54 IL 1 in CreteI-80/I-94/I-294 in South Holland 01956-01-011956current
IL 594 —— —— 01971-01-01197101978-01-011978 Now I-190
  •       Former


Inventory routes
Inventory Route Number sign near Jacksonville IL (Morgan County) on US-67

Illinois uses unique "inventory number" signage on rural roads that are owned or maintained by IDOT but may or may not be part of the US or Illinois highway systems. These number signs are white squares, with a green divided circle. The county name is within the dividing line, the mileage from the county line is in the lower half and the inventory or route number in the upper. Number series vary between IDOT Districts, in some areas the number used on otherwise unnumbered routes are a derivative of the former number (i.e.: "913" used on a section of former IL 13) or a sequential number unrelated to the original or former number (such as the 8900 series numbers used in the Galesburg–Macomb area). On many US and Illinois Routes the posted number is used, with or without a preceding descriptor. These signs are not intended for navigation as route numbers are but rather as guides for IDOT crews and contractors and to identify specific intersections, culverts or other features.[10]

See also
  •  Illinois portal
  •  U.S. Roads portal

References
  1. Carlson, Miriam C. (April 2002). "Out of the Mud: Illinois' Good Roads Movement". Illinois History. Illinois Historic Preservation Agency. 55 (3): 47–9. ISSN 0019-2058. Archived from the original on June 9, 2013. Retrieved April 25, 2014 – via Illinois Periodicals Online.
  2. Carlson, Richard (March 15, 2005). "Illinois Highway Trivia". Illinois Highways Page. Retrieved January 1, 2016.
  3. Carlson, Richard (October 29, 2013). "Routes 200 and up". Illinois Highways Page. Retrieved January 1, 2016.
  4. Carlson, Richard (August 15, 2010). "Routes 101 thru 120". Illinois Highways Page. Retrieved January 1, 2016.
  5. http://www.n9jig.com/busn.html
  6. Carlson, Richard (December 21, 2014). "Routes 41 thru 60". Illinois Highways Page. Retrieved January 1, 2016.
  7. Carlson, Richard (October 2, 2016). "Routes 61 thru 80". Illinois Highways Page. Retrieved November 1, 2016.
  8. Carlson, Richard (April 15, 2009). "Routes 61 thru 80". Illinois Highways Page. Retrieved January 1, 2016.
  9. Carlson, Richard (August 31, 2009). "Routes 121 thru 140". Illinois Highways Page. Retrieved January 1, 2016.
  10. http://www.n9jig.com/trivia.html
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