List of Illinois Routes
| Illinois Routes | |
|---|---|
  
Standard Illinois route markers
|
|
| System information | |
| Maintained by IDOT | |
| Formed: | November 5, 1918[1] |
| Highway names | |
| Interstates: | Interstate X (I-X) |
| US Routes: | U.S. Route X (US X) |
| State: | Illinois Route X (IL X) |
| System links | |
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).
Contents
History
Illinois's state route numbers originated in 1918 as State Bond Issues 1 thru 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 1970's 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.[citation needed]
General notes
Illinois has used route numbers from IL 1 thru 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 "banner" routes, such as "Business", "Alternate", "City", "Bypass" and "Truck" on state-numbered highways. Only a pair of truck routes remain, all other bannered state highways have been renumbered or the markers removed.[citation needed]
List of Illinois Routes
| Number | Length (mi) | Length (km) | Southern or western terminus | Northern or eastern terminus | Formed | Removed | Notes | |
|---|---|---|---|---|---|---|---|---|
 IL 1 |
322.48 | 518.98 | KY 91 in Cave in Rock | I-57 in Chicago | 1918 | current | ||
 IL 2 |
73.91 | 118.95 | IL 40 in Sterling | WIS 213 in South Beloit | 1918 | current | ||
 IL 3 |
187.44 | 301.66 | I-57 / US 51 in Cairo | IL 100 in Grafton | 1918 | current | ||
 IL 4 |
170.44 | 274.30 | IL 13 / IL 127 in Vergennes | I-55 Bus. in Springfield | 1918 | current | ||
 IL 4A |
— | — | — | — | 1926 | 1967 | Now IL 171 | |
 IL 5 |
15.78 | 25.40 | US 67 in Rock Island | I-80 / I-88 / IL 92 / IL 110 (CKC) in East Moline | 1972 | current | ||
 IL 6 |
10.11 | 16.27 | I-74 / I-474 in Peoria | IL 29 in Peoria | c. 1971 | current | ||
 IL 7 |
28.06 | 45.16 | US 6 in Rockdale | IL 43 in Worth | 1918 | current | ||
 IL 8 |
45.51 | 73.24 | IL 97 in Maquon | US 24 in Washington | 1918 | current | ||
 IL 9 |
218.31 | 351.34 | Iowa 2 in Niota | SR 26 / SR 352 in Hoopeston | 1918 | current | ||
 IL 10 |
91.35 | 147.01 | US 136 in Easton | US 150 in Champaign | 1918 | current | ||
 IL 11 |
— | — | — | — | — | — | Now US 40 | |
 IL 12 |
— | — | — | — | — | — | Now US 510 | |
 IL 13 |
151.54 | 243.88 | IL 157 / IL 163 in Centreville | KY 56 in Old Shawneetown | 1918 | current | ||
 IL 14 |
76.24 | 122.70 | US 51 in Du Quoin | SR 66 in Phillipstown | 1918 | current | ||
 IL 15 |
149.64 | 240.82 | I-55 / I-64 / US 40 / IL 3 in East St. Louis | SR 64 in Mt. Carmel | 1918 | current | ||
 IL 16 |
174.66 | 281.09 | IL 100 in Hardin | US 150 / IL 1 / IL 133 in Paris | 1918 | current | ||
 IL 17 |
209.40 | 337.00 | 1st Street in New Boston | SR 2 in Grant Park | 1918 | current | ||
 IL 18 |
39.01 | 62.78 | IL 29 in Henry | IL 17 in Blackstone | 1939 | current | ||
 IL 19 |
33.64 | 54.14 | IL 25 in Elgin | US 41 in Chicago | 1949 | current | ||
 IL 20 |
— | — | — | — | — | — | Now IL 120 | |
 IL 21 |
28.13 | 45.27 | IL 43 in Niles | US 41 in Gurnee | 1918 | current | ||
 IL 22 |
19.7 | 31.7 | US 14 in Fox River Grove | US 41 in Highland Park | 1918 | current | ||
 IL 23 |
126.17 | 203.05 | IL 116 in Pontiac | US 14 in Harvard | 1918 | current | ||
 IL 24 |
— | — | — | — | 1918 | 1940 | Replaced by IL 29 | |
 IL 25 |
35.04 | 56.39 | US 34 in Oswego | IL 62 in Carpentersville | c. 1930 | current | ||
 IL 26 |
139.35 | 224.26 | IL 116 in East Peoria | WIS 69 in Orangeville | 1918 | current | ||
 IL 27 |
— | — | — | — | — | — | Now part of US 52 | |
 IL 28 |
— | — | — | — | — | — | Now part of US 34 | |
 IL 29 |
175.36 | 282.21 | US 51 / IL 16 in Pana | US 6 / IL 89 in Spring Valley | 1918 | current | ||
 IL 30 |
— | — | — | — | — | — | Now IL 91 | |
 IL 31 |
58.41 | 94.00 | US 34 in Oswego | US 12 in Richmond | 1937 | current | ||
 IL 32 |
69.32 | 111.56 | US 40 / IL 33 in Effingham | IL 48 in Cisco | 1918 | current | ||
 IL 33 |
97.17 | 156.38 | IL 128 in Beecher City | US 50 in Lawrenceville | 1918 | current | ||
 IL 34 |
61.74 | 99.36 | Hopkinton Street / Walnut Street in Rosiclare | IL 14 / IL 37 in Benton | 1918 | current | ||
 IL 35 |
2.42 | 3.89 | US 20 in East Dubuque | WIS 35 in East Dubuque | 1938 | current | ||
 IL 36 |
— | — | — | — | — | — | Replaced by IL 94 | |
 IL 37 |
155.07 | 249.56 | US 51 in Cairo | US 45 in Watson | 1918 | current | ||
 IL 38 |
89.28 | 143.68 | US 52 in Dixon | US 12 / US 20 / US 45 in Westchester | 1918 | current | ||
 IL 39 |
— | — | — | — | — | — | Now part of US 150 | |
 IL 40 |
112.05 | 180.33 | I-74 in East Peoria | IL 78 in Mount Carroll | 1918 | current | Formerly designated as IL 88 | |
 IL 41 |
37.53 | 60.40 | US 136 in Adair | US 34 / IL 110 / IL 164 in Galesburg | 1918 | current | ||
 IL 42 |
— | — | — | — | 1924 | 1972 | Was the designation of Sheridan Road | |
 IL 42A |
— | — | — | — | 1925 | 1967 | Replaced by IL 43 | |
 IL 43 |
60.30 | 97.04 | US 30 in Frankfort | US 41 in Park City | 1967 | current | ||
 IL 44 |
— | — | — | — | — | — | Now part of US 52 | |
 IL 45 |
— | — | — | — | — | — | Became IL 179 in 1936; IL 179 was deleted by 1995 | |
 IL 46 |
— | — | — | — | — | — | Became in part US 45 from LaGrange to Des Plaines[5] | |
 IL 47 |
169.76 | 273.20 | IL 10 in Seymour | WIS 120 in Hebron | 1924 | current | ||
 IL 48 |
85.38 | 137.41 | I-55 / IL 127 in Raymond | IL 54 in DeWitt | 1924 | current | ||
 IL 49 |
140.86 | 226.69 | IL 33 in Willow Hill | US 45 / US 52 in Ashkum | 1924 | current | ||
 IL 50 |
66.49 | 107.01 | US 45 / US 52 in Kankakee | US 41 in Skokie | 1924 | current | ||
 IL 51 |
— | — | — | — | — | — | Now part of US 45 | |
 IL 52 |
— | — | — | — | — | — | Replaced by IL 83 | |
 IL 53 |
82.02 | 132.00 | I-55 in Gardner | IL 83 in Long Grove | 1924 | current | ||
 IL 54 |
109.35 | 175.98 | I-55 in Springfield | US 45 in Onarga | 1972 | current | Formerly US 54 | |
 IL 55 |
— | — | — | — | — | — | Replaced by IL 56 | |
 IL 56 |
32.52 | 52.34 | US 30 / IL 47 in Sugar Grove | US 12 / US 20 / US 45 in Bellwood | 1924 | current | ||
 IL 57 |
12.59 | 20.26 | I-172 / IL 110 (CKC) in Fall Creek | US 24 / IL 104 in Quincy | 1949 | current | ||
 IL 58 |
28.30 | 45.54 | IL 25 in Elgin | US 41 in Skokie | 1924 | current | ||
 IL 59 |
71.13 | 114.47 | I-55 in Shorewood | IL 173 in Antioch | 1924 | current | ||
 IL 59A |
— | — | — | — | — | — | Replaced by IL 60 | |
 IL 60 |
17.22 | 27.71 | IL 120 in Volo | US 41 in Lake Forest | 1967 | current | Formerly IL 59A | |
 IL 61 |
44.77 | 72.05 | IL 96 in Ursa | US 136 / IL 110 / IL 336 in Tennessee | 1924 | current | ||
 IL 62 |
20.82 | 33.51 | IL 31 in Algonquin | IL 83 in Des Plaines | 1924 | current | ||
 IL 63 |
— | — | — | — | — | — | Replaced in part by IL 68 | |
 IL 64 |
135.99 | 218.85 | US 52 / Iowa 64 in Savanna | US 41 in Chicago | 1924 | current | ||
 IL 65 |
— | — | — | — | — | — | Swapped routes with US 34, pulled in 1971[6] | |
 IL 66 |
— | — | — | — | — | — | Now IL 126 | |
 IL 67 |
— | — | — | — | — | — | Replaced by IL 176 | |
 IL 68 |
25.74 | 41.42 | IL 72 in East Dundee | I-94 / US 41 in Glencoe | 1942 | current | ||
 IL 69 |
— | — | — | — | — | — | Now part of US 52 | |
 IL 70 |
19.01 | 30.59 | IL 75 in Durand | US 20 Bus. in Rockford | 1924 | current | ||
 IL 70A |
— | — | — | — | — | — | Replaced by IL 170 | |
 IL 71 |
69.37 | 111.64 | I-180/IL 29 in Hennepin | US 34 in Oswego | 1938 | current | ||
 IL 72 |
110.71 | 178.17 | IL 73 in Lanark | IL 43 in Chicago | 1924 | current | ||
 IL 73 |
29.32 | 47.19 | US 52/IL 64 in Lanark | Wisconsin state line near Winslow | 1924 | current | ||
 IL 74 |
— | — | — | — | — | — | Now IL 26 | |
 IL 75 |
41.64 | 67.01 | IL 26 in Freeport | WIS 67 in South Beloit | 1924 | current | ||
 IL 76 |
15.67 | 25.22 | Business US 20 in Belvidere | WIS 140 east of South Beloit | 1924 | current | ||
 IL 78 |
215.51 | 346.83 | US 67/Business US 67/IL 104 in Jacksonville | WIS 78 near Warren | 1924 | current | ||
 IL 80 |
— | — | — | — | — | — | Now IL 84 | |
 IL 81 |
25.78 | 41.49 | US 150 in Lynn Center | IL 78 in Kewanee | 1924 | current | ||
 IL 82 |
28.84 | 46.41 | IL 17 in Bishop Hill | IL 92 in Geneseo | 1924 | current | ||
 IL 83 |
92.22 | 148.41 | US 30 in Lynwood | WIS 83 in Antioch | 1941 | current | ||
 IL 84 |
93.93 | 151.17 | US 6 in Colona | WIS 80 near Galena | 1955 | current | ||
 IL 85 |
— | — | — | — | — | — | Now US 67 | |
 IL 86 |
— | — | — | — | — | — | Now IL 2 | |
 IL 87 |
— | — | — | — | — | — | Now IL 26 | |
 IL 88 |
— | — | — | — | — | — | Now IL 40 | |
 IL 89 |
55.48 | 89.29 | IL 116 in Metamora | US 34 in LaMoille | 1924 | current | ||
 IL 90 |
15.80 | 25.43 | IL 78 near Laura | IL 40 near Edelstein | 1924 | current | ||
 IL 91 |
40.72 | 65.53 | US 150 in Peoria | US 34/IL 78 in Kewanee | 1941 | current | ||
 IL 92 |
106.41 | 171.25 | Iowa 92 near Muscatine, Iowa | US 34 in LaMoille | 1939 | current | ||
 IL 93 |
9.60 | 15.45 | IL 91 in Elmira | IL 40 in Bradford | 1924 | current | ||
 IL 94 |
128.76 | 207.22 | US 24 in Camp Point | US 67 in Oak Grove | 1924 | current | ||
 IL 94A |
— | — | — | — | — | — | Now IL 164 | |
 IL 94B |
— | — | — | — | — | — | Now IL 135 | |
 IL 95 |
17.12 | 27.55 | IL 41 in Bardolph | IL 97 in Cuba | 1918 | current | ||
 IL 95A |
— | — | — | — | — | — | Now IL 94 | |
 IL 96 |
141.16 | 227.17 | IL 100 in Kampsville | IL 94 in Lomax | 1924 | current | ||
 IL 97 |
104.43 | 168.06 | I-55/I-72/US 36 in Springfield | I-74/US 150 in Knoxville | 1937 | current | ||
 IL 97A |
— | — | — | — | — | — | Now IL 116 | |
 IL 98 |
8.36 | 13.45 | IL 29 in Pekin | I-155 in Morton | 1939 | current | ||
 IL 99 |
32.08 | 51.63 | IL 104 in Chambersburg | IL 101 in Huntsville | 1936 | current | ||
 IL 100 |
159.09 | 256.03 | US 67 in Alton | IL 78 in Dunfermline | 1924 | current | ||
 IL 101 |
19.43 | 31.27 | IL 61 in Augusta | US 67 in Littleton | 1924 | current | ||
 IL 102 |
18.33 | 29.50 | US 45/US 52 in Bourbonnais | IL 53 in Wilmington | 1924 | current | ||
 IL 103 |
9.18 | 14.77 | US 24 in Ripley | US 67/IL 100 in Frederick | 1924 | current | ||
 IL 104 |
125.91 | 202.63 | US 24/IL 57 in Quincy | IL 29 in Taylorville | 1924 | current | ||
 IL 105 |
37.58 | 60.48 | IL 48 in Decatur | I-72 in Monticello | 1945 | current | ||
 IL 106 |
66.47 | 106.97 | I-72/US 36/IL 110 (CKC) in Hull | US 67 in White Hall, Illinois | 1938 | current | ||
 IL 107 |
23.14 | 37.24 | I-72/US 36/US 54 in Pittsfield | IL 99 in Mt. Sterling | 1924 | current | ||
 IL 108 |
54.06 | 87.00 | IL 100 in Kampsville | I-55 in Raymond | 1924 | current | ||
 IL 109 |
8.22 | 13.23 | IL 3 in Dow | US 67 in Jerseyville | 1924 | current | ||
 IL 110 |
328 | 528 | I-72 near Hannibal, Missouri | I-90/I-94/I-290 in Chicago | 2010 | current | Chicago-Kansas City Expressway | |
 IL 111 |
82.18 | 132.26 | Lake Drive in Centreville | IL 104 in Waverly | 1924 | current | ||
 IL 112 |
— | — | — | — | — | — | Now IL 159 | |
 IL 113 |
33.95 | 54.64 | IL 47 in Mazon | IL 17 in Kankakee | 1924 | current | ||
 IL 113N |
— | — | — | — | 1940 | 1961 | Now IL 102 | |
 IL 113S |
— | — | — | — | 1940 | 1961 | Now IL 113 | |
 IL 114 |
7.40 | 11.91 | IL 1/IL 17 in Momence | SR 10 near Lake Village, Indiana | 1924 | current | ||
 IL 115 |
63.37 | 101.98 | IL 9 in Elliott | US 45/US 52 in Kankakee, Illinois | 1924 | current | ||
 IL 116 |
176.07 | 283.36 | US 34/IL 94 in Gladstone | US 45 in Ashkum | 1924 | current | ||
 IL 116A |
— | — | — | — | — | — | Now IL 117 | |
 IL 117 |
33.85 | 54.48 | I-74 in Goodfield | IL 17 in Toluca | 1924 | current | ||
 IL 119 |
7.78 | 12.52 | US 136/IL 1 west of Alvin | SR 28 east of Alvin | 1924 | current | ||
 IL 120 |
34.48 | 55.49 | US 14 in Woodstock | IL 131 in Waukegan | 1941 | current | ||
 IL 121 |
109.48 | 176.19 | IL 130 in Greenup | I-55/IL 10 in Lincoln | 1924 | current | ||
 IL 122 |
31.53 | 50.74 | IL 29 in Green Valley | IL 9 in Danvers | 1924 | current | ||
 IL 123 |
33.72 | 54.27 | IL 125 in Pleasant Plains | I-55 in Williamsville | 1924 | current | ||
 IL 124 |
5.71 | 9.19 | IL 123 in Williamsville | Business I-55 in Sherman | 1940 | current | ||
 IL 125 |
37.10 | 59.71 | US 67/IL 100 in Beardstown | IL 97 in Pleasant Plains | 1924 | current | ||
 IL 126 |
17.25 | 27.76 | IL 47 in Yorkville | I-55 in Plainfield | 1935 | current | ||
 IL 127 |
167.53 | 269.61 | IL 3 in Unity | I-55/IL 48 in Raymond | 1924 | current | ||
| IL 127A | — | — | — | — | — | — | Now IL 143 | |
 IL 128 |
55.57 | 89.43 | I-70 in Altamont | IL 121 in Dalton City | 1924 | current | ||
 IL 129 |
4.06 | 6.53 | IL 113 in Braidwood | I-55 north of Braidwood | 1960 | current | ||
 IL 130 |
135.87 | 218.66 | IL 1 in Grayville | I-74 in Urbana | 1924 | current | ||
 IL 130A |
5.0 | 8.0 | — | — | 1930 | 1942 | Newton to Ste. Marie, pulled in 1942[7] | |
 IL 131 |
15.15 | 24.38 | IL 176 in Lake Bluff | WIS 31 near Pleasant Prairie, Wisconsin | 1938 | current | ||
 IL 132 |
13.57 | 21.84 | IL 59 in Fox Lake Hills | IL 131 in Waukegan | 1950 | current | ||
 IL 133 |
52.05 | 83.77 | IL 32 in Lovington | US 150/IL 1/IL 16 in Paris | 1924 | current | ||
 IL 134 |
5.62 | 9.04 | US 12/IL 59 in Fox Lake | IL 120 in Hainesville | 1950 | current | ||
 IL 135 |
20.31 | 32.69 | IL 164 in Kirkwood | US 67 in Alexis | 1937 | current | ||
 IL 136 |
3.22 | 5.18 | Iowa 136 in Fulton | US 30 east of Fulton | 1967 | current | ||
 IL 137 |
23.49 | 37.80 | IL 83 in Grayslake | WIS 32 in Winthrop Harbor | 1953 | current | ||
 IL 138 |
14.95 | 24.06 | IL 159 in Bunker Hill | Illinois Street in Mt. Olive | 1942 | current | ||
 IL 139 |
— | — | — | — | — | — | Now IL 14 | |
 IL 140 |
52.05 | 83.77 | IL 143 in Alton | US 40 near Mulberry Grove | 1935 | current | ||
 IL 141 |
18.17 | 29.24 | US 45 north of Texas City | SR 62 east of New Haven | 1924 | current | ||
 IL 142 |
55.06 | 88.61 | Calhoun Street in Equality | I-57 in Mt. Vernon | 1926 | current | ||
 IL 142A |
— | — | — | — | 1924 | 1977 | Now IL 242 | |
 IL 143 |
47.96 | 77.18 | US 67 in Alton | IL 127 in Tamalco | 1937 | current | ||
 IL 144 |
— | — | — | — | 1926 | 1963 | Now IL 149 | |
 IL 145 |
43.47 | 69.96 | US 45 in Metropolis | US 45/IL 34 in Harrisburg | 1926 | current | ||
 IL 146 |
92.93 | 149.56 | MO 34/MO 74 in East Cape Girardeau | IL 1 in Cave-In-Rock | 1926 | current | ||
 IL 147 |
12.81 | 20.62 | IL 146 in Vienna | IL 145 in Eddyville | 1947 | current | ||
 IL 148 |
54.85 | 88.27 | IL 37 in Pulleys Mill | IL 37/IL 142 in Mt. Vernon | 1926 | current | ||
 IL 149 |
45.92 | 73.90 | IL 3 in Gorham | IL 34 in Thompsonville | 1926 | current | ||
 IL 150 |
24.19 | 38.93 | MO 51 in Chester | IL 154 in Cutler | 1926 | current | ||
 IL 151 |
7.84 | 12.62 | IL 3 in Jacob | IL 4 in Ava | 1940 | current | ||
 IL 152 |
6.76 | 10.88 | IL 13/IL 127 in Pyatts | US 51 in Du Quoin | 1924 | current | ||
 IL 153 |
18.35 | 29.53 | IL 154 in Sparta | IL 15 in Addieville | 1926 | current | ||
 IL 154 |
63.63 | 102.40 | IL 3/IL 159 in Red Bud | IL 37 in Whittington | 1926 | current | ||
 IL 155 |
10.81 | 17.40 | Fort de Chartres State Historical Site | IL 3 in Ruma | 1924 | current | ||
 IL 156 |
22.95 | 36.93 | South Meyer Avenue/C Road in Valmeyer | IL 13 in New Athens | 1926 | current | ||
 IL 157 |
33.50 | 53.91 | IL 3 in Cahokia | IL 140 in Hamel | 1926 | current | ||
 IL 158 |
25.81 | 41.54 | IL 3 in Columbia | I-64/US 50 in O'Fallon | 1926 | current | ||
 IL 159 |
64.90 | 104.45 | IL 3/IL 154 in Red Bud | IL 16 in Royal Lakes | 1926 | current | ||
 IL 160 |
46.06 | 74.13 | IL 15 in Addieville | IL 140 in Alhambra | 1959 | current | ||
 IL 161 |
67.24 | 108.21 | St. Clair Avenue in Fairview Heights | IL 37 in Kell | 1926 | current | ||
 IL 162 |
16.36 | 26.33 | IL 203 in Granite City | US 40 in Troy | 1954 | current | ||
 IL 163 |
9.89 | 15.92 | IL 158 in Millstadt | IL 15 in Alorton | 1954 | current | ||
 IL 164 |
35.70 | 57.45 | US 34 in Gladstone | US 34/IL 41/Illinois Route 110/IL 110 (CKC) in Galesburg | 1937 | current | ||
 IL 165 |
29.64 | 47.70 | IL 9 in Merna | IL 47 in Sibley | 1924 | current | ||
 IL 166 |
14.43 | 23.22 | US 45 in New Burnside | IL 13 in Pittsburg | 1924 | current | ||
 IL 167 |
12.24 | 19.70 | US 34 in Wataga | IL 180 in Victoria, Illinois | 1924 | current | ||
 IL 168 |
— | — | — | — | — | — | Now IL 97 | |
 IL 169 |
9.04 | 14.55 | IL 37 in Karnak | US 45 in New Columbia | 1949 | current | ||
 IL 170 |
25 | 40 | IL 23 in Cornell | US 6 in Seneca, Illinois | 1946 | current | ||
 IL 171 |
38.61 | 62.14 | US 6 in Joliet | IL 72 in Chicago | 1946 | current | ||
 IL 172 |
13.06 | 21.02 | IL 92 in Yorktown | IL 40 in Tampico | 1946 | current | ||
 IL 173 |
66.20 | 106.54 | IL 251 in Machesney Park | IL 137 in Zion | 1924 | current | ||
 IL 174 |
5.3 | 8.5 | IL 88 in Peoria | IL 91 west of Alta | 1924 | 1983 | ||
 IL 175 |
2 | 3 | US 24/IL 9 near Glasford | Glasford | 1924 | 1935 | ||
 IL 176 |
41.28 | 66.43 | IL 23 in Marengo | IL 131 in Lake Bluff | 1926 | current | ||
 IL 177 |
47.59 | 76.59 | IL 13/IL 158/IL 159 in Belleville | US 51 in Irvington | 1924 | current | ||
 IL 178 |
8.49 | 13.66 | Ed Lambert Road in Lowell | I-80 in North Utica | 1924 | current | ||
 IL 179 |
16.3 | 26.2 | IL 251 near Rutland | IL 18 near Streator | 1935 | 1995 | ||
 IL 180 |
15.43 | 24.83 | US 150 in Williamsfield | IL 17 in Victoria | 1924 | current | ||
 IL 181 |
— | — | — | — | — | — | Now IL 33 | |
 IL 182 |
— | — | — | — | — | — | Now IL 161 | |
 IL 183 |
— | — | — | — | — | — | Now IL 154 | |
 IL 184 |
5.87 | 9.45 | IL 149 in Royalton | IL 14 in Mulkeytown | 1924 | current | ||
 IL 185 |
49.88 | 80.27 | IL 127 in Taylor Springs | IL 37 in Farina | 1924 | current | ||
 IL 186 |
— | — | — | — | — | — | Now IL 170 | |
 IL 190 |
— | — | — | — | — | — | Now I-88 | |
 IL 192 |
8.31 | 13.37 | IL 92 in Illinois | IL 94 in Taylor Ridge | 1955 | current | ||
 IL 194 |
— | — | — | — | — | — | Now I-90/I-94 in Chicago | |
 IL 199 |
— | — | — | — | — | — | Now IL 92 | |
 IL 203 |
9.51 | 15.30 | Collinsville Road in Fairmont City | I-270 in Granite City | 1964 | current | ||
 IL 213 |
— | — | — | — | — | — | Now [Illinois Route 171 | |
 IL 226 |
— | — | — | — | — | — | Now IL 172 | |
 IL 242 |
18.67 | 30.05 | IL 142 in McLeansboro | IL 15 in Wayne City | 1924 | current | ||
 IL 250 |
33.44 | 53.82 | US 50 in Noble | Business US 50 in Lawrenceville | 1965 | current | ||
 IL 251 |
135.32 | 217.78 | I-39/US 51 in Hudson | US 51/IL 75 in South Beloit | 1982 | current | ||
 IL 255 |
23.3 | 37.5 | I-255/I-270 in Pontoon Beach | US 67 in Godfrey | 1998 | current | ||
 IL 267 |
59 | 95 | US 67/IL 111 in Godfrey | Business I-72/Business US 67/IL 104 in Jacksonville | 1965 | current | ||
 IL 316 |
— | — | — | — | — | — | Now IL 16 | |
 IL 336 |
80 | 129 | I-172/US 24/IL 110 (CKC) in Quincy | US 136/IL 110 (CKC) in Macomb | 1990 | current | ||
 IL 351 |
8.55 | 13.76 | IL 71/IL 251 in Oglesby | I-80 in LaSalle | 1966 | current | ||
 IL 390 |
6.01 | 9.67 | US 20 in Hanover Park | I-290 in Itasca | 2013 | current | Elgin-O'Hare Expressway | |
 IL 394 |
14.63 | 23.54 | IL 1 in Crete | I-80/I-94/I-294 in South Holland | 1956 | current | ||
 IL 594 |
— | — | — | — | — | — | Now I-190 | |
|
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Inventory routes
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 (ie: "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 guided for IDOT crews and contractors and to identify specific intersections, culverts or other features.[citation needed]
Unnumbered routes
Some routes in Illinois are state maintained, but not numbered.[8]
Some old alignments of routes are state maintained, but are not signed. They still may, however, have an unsigned designation.[9]
See also
References
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found.[self-published source]
- ↑ Lua error in package.lua at line 80: module 'strict' not found.[self-published source]
- ↑ Lua error in package.lua at line 80: module 'strict' not found.[self-published source]
- ↑ Lua error in package.lua at line 80: module 'strict' not found.[self-published source]
- ↑ Lua error in package.lua at line 80: module 'strict' not found.[self-published source]
- ↑ Lua error in package.lua at line 80: module 'strict' not found.[self-published source]
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.[self-published source]
