List of Illinois Routes

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Illinois Routes
Illinois Route 1 markerIllinois Route 78 markerIllinois Route 110 marker
Standard Illinois route markers
System information
Maintained by IDOT
Formed: November 5, 1918 (1918-11-05)[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).

History[edit]

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[edit]

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 special routes, such as "Business", "Alternate", "City", "Bypass" and "Truck" on state-numbered highways. Only a pair of truck routes remain, all other special state highways have been renumbered or the markers removed.[citation needed]

Primary routes[edit]

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-1 was posted on what is now IL-294 from 1957 to 1964, the old road was Alt-IL-1 during that time.
IL 2 73.91 118.95 IL 40 in Sterling WIS 213 in South Beloit 1918 current Originally Rockford to Dixon to Mendota to Cairo. Replaced by US-51 south of Mendota
IL 3 187.44 301.66 I-57 / US 51 in Cairo IL 100 in Grafton 1918 current Originally Morrison to Chester, replaced by other roads including IL-78 and US-67 north of the St. Louis area.
IL 4 170.44 274.30 IL 13 / IL 127 in Vergennes I-55 Bus. in Springfield 1918 current 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 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 Originally Chicago to East Dubuque, replaced mostly by US-20 except near Rockford until that was replaced later by Business 20. Later used to replace IL-190 on the E-W Tollway until 1987 when it was replaced by I-88 east of I-80
IL 6 10.11 16.27 I-74 / I-474 in Peoria IL 29 in Peoria c. 1971 current Originally Chicago to Fulton, replaced by US-40, later to become Alt-US-30 and now IL-38. Applied to freeway extension of I-474 around 1982
IL 7 28.06 45.16 US 6 in Rockdale IL 43 in Worth 1918 current Originally Chicago to E. Moline, replaced west of Orland Park by US-6 about 1928 then extended to Rockdale in 1969
IL 8 45.51 73.24 IL 97 in Maquon US 24 in Washington 1918 current Originally Gulfport to Sheldon, removed in parts and replaced by US-34, US-24 and other routes.
IL 9 218.31 351.34 Iowa 2 in Niota SR 26 / SR 352 in Hoopeston 1918 current Originally Hamilton to Cheneyville, replaced in part by US-136, IL-41 and IL-9
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 50
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 Formerly IL 316
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 Formerly known as IL 118
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 1917 1937 became part of IL 88
IL 40 112.05 180.33 I-74 in East Peoria IL 78 in Mount Carroll 1995 current Formerly 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 Formerly IL 42A
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 La Grange 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 21 and 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 77 1917 1936 Now IL 64
IL 77 1937 1937 Now IL 162
IL 78 215.51 346.83 US 67/Business US 67/IL 104 in Jacksonville WIS 78 near Warren 1924 current
IL 79 1917 1936 Now IL 35
IL 79 1967 1981 Now IL 336
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, Will County 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 114 7.40 11.91 IL 1/IL 17 in Momence SR 10 near Lake Village, Indiana 1924 current
IL 113N 1940 1961 Now IL 102
IL 113S 1940 1961 Now IL 113
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 118 1924 1933 Now IL 23
IL 118 1934 1937 Now St. Charles Rd (Chicago)
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 Formerly IL 20
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 1924 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 Formerly IL 66
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 Formerly IL 144
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 Formerly IL 70A and IL 186
IL 171 38.61 62.14 US 6 in Joliet IL 72 in Chicago 1946 current Formerly IL 4A and IL 213
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 Formerly IL 67
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 IL 171
IL 226 Now IL 172
IL 242 18.67 30.05 IL 142 in McLeansboro IL 15 in Wayne City 1924 current Formerly IL 142A
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 Formerly the 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
  •       Former

Inventory routes[edit]

Illinois uses unique "inventory iumber" 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 guides for IDOT crews and contractors and to identify specific intersections, culverts or other features.[8]

Unnumbered routes[edit]

Some routes in Illinois are state maintained, but not numbered.[9]

Some old alignments of routes are state maintained, but are not signed. They still may, however, have an unsigned designation.[10]

See also[edit]

References[edit]

  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 – via Illinois Periodicals Online. 
  2. ^ a b c d Carlson, Richard (March 15, 2005). "Illinois Highway Trivia". Illinois Highways Page. Retrieved January 1, 2016. [self-published source]
  3. ^ Carlson, Richard (October 29, 2013). "Routes 200 and up". Illinois Highways Page. Retrieved January 1, 2016. [self-published source]
  4. ^ Carlson, Richard (August 15, 2010). "Routes 101 thru 120". Illinois Highways Page. Retrieved January 1, 2016. [self-published source]
  5. ^ Carlson, Richard (December 21, 2014). "Routes 41 thru 60". Illinois Highways Page. Retrieved January 1, 2016. [self-published source]
  6. ^ Carlson, Richard (April 15, 2009). "Routes 61 thru 80". Illinois Highways Page. Retrieved January 1, 2016. [self-published source]
  7. ^ Carlson, Richard (August 31, 2009). "Routes 121 thru 140". Illinois Highways Page. Retrieved January 1, 2016. [self-published source]
  8. ^ http://www.n9jig.com/trivia.html
  9. ^ Cook County Highway Department Map Division (June 19, 2007). Highway System showing Maintenance Districts (PDF) (Map). 1:90,000. Cook County Highway Department. Retrieved February 12, 2011. 
  10. ^ Burmaster, Bill. "Illinois State I.D. Routes". Roads of the Mid-South & West. Retrieved April 25, 2014. [self-published source]

External links[edit]