List of Illinois Routes

Illinois Routes
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 Highways:	U.S. Route X (US X)
State:	Illinois Route X (IL X)
System links
Illinois State Highway System Interstate U.S. State Tollways

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

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.

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 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
IL0001 !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.
IL0002 !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
IL0003 !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.
IL0004 !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.
IL0004A !IL 4A	—	—	—	—	1926	1967	Replaced by IL 171
IL0005 !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
IL0006 !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
IL0007 !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
IL0008 !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.
IL0009 !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
IL0010 !IL 10	91.35	147.01	US 136 in Easton	US 150 in Champaign	1918	current	Originally Jacksonville to Decature, later extended to Danville and Havana.
IL0011 !IL 11	—	—	—	—	—	—	Originally Terre Haute to St. Louis, replaced by US 40
IL0012 !IL 12	—	—	—	—	—	—	Originally Vincennse to St. Louis, replaced by US 50
IL0013 !IL 13	151.54	243.88	IL 157 / IL 163 in Centreville	KY 56 in Old Shawneetown	1918	current	Originally Old Shawneetown to St. Louis
IL0014 !IL 14	76.24	122.70	US 51 in Du Quoin	SR 66 in Phillipstown	1918	current	Originally DuQuoin to Carmi
IL0015 !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	Originally E. St. Louis to Albion
IL0016 !IL 16	174.66	281.09	IL 100 in Hardin	US 150 / IL 1 / IL 133 in Paris	1918	current	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.
IL0017 !IL 17	209.4	337.0	1st Street in New Boston	SR 2 in Grant Park	1918	current
IL0018 !IL 18	39.01	62.78	IL 29 in Henry	IL 17 in Blackstone	1939	current
IL0019 !IL 19	33.64	54.14	IL 25 in Elgin	US 41 in Chicago	1949	current
IL0020 !IL 20	—	—	—	—	—	—	Replaced by IL 120
IL0021 !IL 21	28.13	45.27	IL 43 in Niles	US 41 in Gurnee	1918	current
IL0022 !IL 22	19.7	31.7	US 14 in Fox River Grove	US 41 in Highland Park	1918	current
IL0022A !IL 22A	—	—	—	—	1924	1925	Now part of IL 63, which is deleted in 1973; then IL 68
IL0023 !IL 23	126.17	203.05	IL 116 in Pontiac	US 14 in Harvard	1918	current	Formerly known as IL 118
IL0024 !IL 24	—	—	—	—	1918	1940	Replaced by IL 29
IL0025 !IL 25	35.04	56.39	US 34 in Oswego	IL 62 in Carpentersville	c. 1930	current
IL0026 !IL 26	139.35	224.26	IL 116 in East Peoria	WIS 69 in Orangeville	1918	current
IL0027 !IL 27	—	—	—	—	—	—	Now part of US 52
IL0028 !IL 28	—	—	—	—	—	—	Now part of US 34
IL0029 !IL 29	175.36	282.21	US 51 / IL 16 in Pana	US 6 / IL 89 in Spring Valley	1918	current
IL0030 !IL 30	—	—	—	—	1918	1941	Replaced by IL 91
IL0031 !IL 31	58.41	94.00	US 34 in Oswego	US 12 in Richmond	1937	current
IL0032 !IL 32	69.32	111.56	US 40 / IL 33 in Effingham	IL 48 in Cisco	1918	current
IL0033 !IL 33	97.17	156.38	IL 128 in Beecher City	US 50 in Lawrenceville	1918	current
IL0034 !IL 34	61.74	99.36	Hopkinton Street / Walnut Street in Rosiclare	IL 14 / IL 37 in Benton	1918	current
IL0035 !IL 35	2.42	3.89	US 20 in East Dubuque	WIS 35 in East Dubuque	1938	current
IL0036 !IL 36	—	—	—	—	1918	1937	Replaced by IL 94
IL0037 !IL 37	155.07	249.56	US 51 in Cairo	US 45 in Watson	1918	current
IL0038 !IL 38	89.28	143.68	US 52 in Dixon	US 12 / US 20 / US 45 in Westchester	1918	current
IL0039 !IL 39	—	—	—	—	—	—	Now part of US 150
IL0040 !IL 40	—	—	—	—	1917	1937	became part of IL 88
IL0040 !IL 40	112.05	180.33	I-74 in East Peoria	IL 78 in Mount Carroll	1995	current	Formerly IL 88
IL0041 !IL 41	37.53	60.40	US 136 in Adair	US 34 / IL 110 / IL 164 in Galesburg	1918	current
IL0042 !IL 42	—	—	—	—	1924	1972	Was the designation of Sheridan Road
IL0042A !IL 42A	—	—	—	—	1925	1967	Replaced by IL 43
IL0043 !IL 43	60.3	97.0	US 30 in Frankfort	US 41 in Park City	1967	current	Formerly IL 42A
IL0044 !IL 44	—	—	—	—	—	—	Now part of US 52
IL0045 !IL 45	—	—	—	—	—	—	Became IL 179 in 1936; IL 179 was deleted by 1995
IL0046 !IL 46	—	—	—	—	—	—	Became in part US 45 from La Grange to Des Plaines^[6]
IL0047 !IL 47	169.76	273.20	IL 10 in Seymour	WIS 120 in Hebron	1924	current
IL0048 !IL 48	85.38	137.41	I-55 / IL 127 in Raymond	IL 54 in DeWitt	1924	current
IL0049 !IL 49	140.86	226.69	IL 33 in Willow Hill	US 45 / US 52 in Ashkum	1924	current
IL0050 !IL 50	66.49	107.01	US 45 / US 52 in Kankakee	US 41 in Skokie	1924	current
IL0051 !IL 51	—	—	—	—	—	—	Now part of US 45
IL0052 !IL 52	—	—	—	—	—	—	Replaced by IL 83
IL0053 !IL 53	82.02	132.00	I-55 in Gardner	IL 83 in Long Grove	1924	current
IL0054 !IL 54	109.35	175.98	I-55 in Springfield	US 45 in Onarga	1972	current	Formerly US 54
IL0055 !IL 55	—	—	—	—	—	—	Replaced by IL 56
IL0056 !IL 56	32.52	52.34	US 30 / IL 47 in Sugar Grove	US 12 / US 20 / US 45 in Bellwood	1924	current
IL0057 !IL 57	12.59	20.26	I-172 / IL 110 (CKC) in Fall Creek	US 24 / IL 104 in Quincy	1949	current
IL0058 !IL 58	28.3	45.5	IL 25 in Elgin	US 41 in Skokie	1924	current
IL0059 !IL 59	71.13	114.47	I-55 in Shorewood	IL 173 in Antioch	1924	current
IL0059A !IL 59A	—	—	—	—	—	—	Replaced by IL 60
IL0060 !IL 60	17.22	27.71	IL 120 in Volo	US 41 in Lake Forest	1967	current	Formerly IL 59A
IL0061 !IL 61	44.77	72.05	IL 96 in Ursa	US 136 / IL 110 / IL 336 in Tennessee	1924	current
IL0062 !IL 62	20.82	33.51	IL 31 in Algonquin	IL 83 in Des Plaines	1924	current
IL0063 !IL 63	—	—	—	—	1926	1973	Replaced in part by IL 21, IL 59, and IL 68
IL0064 !IL 64	136	219	US 52 / Iowa 64 in Savanna	US 41 in Chicago	1924	current
IL0065 !IL 65	—	—	—	—	1924	1971	Swapped routes with US 34, pulled in 1971^[7]
IL0066 !IL 66	—	—	—	—	—	—	Replaced by IL 126
IL0067 !IL 67	—	—	—	—	—	—	Replaced in part by IL 176
IL0068 !IL 68	25.74	41.42	IL 72 in East Dundee	I-94 / US 41 in Glencoe	1942	current
IL0069 !IL 69	—	—	—	—	—	—	Replaced in part by US 52
IL0070 !IL 70	19.01	30.59	IL 75 in Durand	US 20 Bus. in Rockford	1924	current
IL0070A !IL 70A	—	—	—	—	—	—	Replaced by IL 170
IL0071 !IL 71	69.37	111.64	I-180/IL 29 in Hennepin	US 34 in Oswego	1938	current
IL0072 !IL 72	110.71	178.17	IL 73 in Lanark	IL 43 in Chicago	1924	current
IL0073 !IL 73	29.32	47.19	US 52/IL 64 in Lanark	Wisconsin state line near Winslow	1924	current
IL0074 !IL 74	—	—	—	—	—	—	Replaced in part by IL 26
IL0075 !IL 75	41.64	67.01	IL 26 in Freeport	WIS 67 in South Beloit	1924	current
IL0076 !IL 76	15.67	25.22	Business US 20 in Belvidere	WIS 140 east of South Beloit	1924	current
IL0077 !IL 77	—	—	—	—	1917	1936	Replaced by IL 64
IL0078 !IL 78	215.51	346.83	US 67/Business US 67/IL 104 in Jacksonville	WIS 78 near Warren	1924	current
IL0079 !IL 79	—	—	—	—	1917	1936	Replaced by IL 35
IL0079 !IL 79	—	—	—	—	1967	1981	Replaced by IL 336
IL0080 !IL 80	—	—	—	—	—	—	Replaced part of US 150 and IL 84
IL0081 !IL 81	25.78	41.49	US 150 in Lynn Center	IL 78 in Kewanee	1924	current
IL0082 !IL 82	28.84	46.41	IL 17 in Bishop Hill	IL 92 in Geneseo	1924	current
IL0083 !IL 83	92.22	148.41	US 30 in Lynwood	WIS 83 in Antioch	1941	current
IL0084 !IL 84	93.93	151.17	US 6 in Colona	WIS 80 near Galena	1955	current
IL0085 !IL 85	—	—	—	—	—	—	Now US 67
IL0086 !IL 86	—	—	—	—	—	—	Now IL 2
IL0087 !IL 87	—	—	—	—	—	—	Now IL 26
IL0088 !IL 88	—	—	—	—	—	—	Now IL 40
IL0089 !IL 89	55.48	89.29	IL 116 in Metamora	US 34 in LaMoille	1924	current
IL0090 !IL 90	15.8	25.4	IL 78 near Laura	IL 40 near Edelstein	1924	current
IL0091 !IL 91	40.72	65.53	US 150 in Peoria	US 34/IL 78 in Kewanee	1941	current
IL0092 !IL 92	106.41	171.25	Iowa 92 near Muscatine, Iowa	US 34 in LaMoille	1939	current
IL0093 !IL 93	9.6	15.4	IL 91 in Elmira	IL 40 in Bradford	1924	current
IL0094 !IL 94	128.76	207.22	US 24 in Camp Point	US 67 in Oak Grove	1924	current
IL0094A !IL 94A	—	—	—	—	—	—	Now IL 164
IL0094B !IL 94B	—	—	—	—	—	—	Now IL 135
IL0095 !IL 95	17.12	27.55	IL 41 in Bardolph	IL 97 in Cuba	1918	current
IL0095A !IL 95A	—	—	—	—	—	—	Now IL 94
IL0096 !IL 96	141.16	227.17	IL 100 in Kampsville	IL 94 in Lomax	1924	current
IL0097 !IL 97	104.43	168.06	I-55/I-72/US 36 in Springfield	I-74/US 150 in Knoxville	1937	current
IL0097A !IL 97A	—	—	—	—	—	—	Now IL 116
IL0098 !IL 98	8.36	13.45	IL 29 in Pekin	I-155 in Morton	1939	current
IL0099 !IL 99	32.08	51.63	IL 104 in Chambersburg	IL 101 in Huntsville	1936	current
IL0100 !IL 100	159.09	256.03	US 67 in Alton	IL 78 in Dunfermline	1924	current
IL0101 !IL 101	19.43	31.27	IL 61 in Augusta	US 67 in Littleton	1924	current
IL0102 !IL 102	18.33	29.50	US 45/US 52 in Bourbonnais	IL 53 in Wilmington, Will County	1924	current
IL0103 !IL 103	9.18	14.77	US 24 in Ripley	US 67/IL 100 in Frederick	1924	current
IL0104 !IL 104	125.91	202.63	US 24/IL 57 in Quincy	IL 29 in Taylorville	1924	current
IL0105 !IL 105	37.58	60.48	IL 48 in Decatur	I-72 in Monticello	1945	current
IL0106 !IL 106	66.47	106.97	I-72/US 36/IL 110 (CKC) in Hull	US 67 in White Hall, Illinois	1938	current
IL0107 !IL 107	23.14	37.24	I-72/US 36/US 54 in Pittsfield	IL 99 in Mt. Sterling	1924	current
IL0108 !IL 108	54.06	87.00	IL 100 in Kampsville	I-55 in Raymond	1924	current
IL0109 !IL 109	8.22	13.23	IL 3 in Dow	US 67 in Jerseyville	1924	current
IL0110 !IL 110	328	528	I-72 near Hannibal, Missouri	I-90/I-94/I-290 in Chicago	2010	current	Chicago-Kansas City Expressway
IL0111 !IL 111	82.18	132.26	Lake Drive in Centreville	IL 104 in Waverly	1924	current
IL0112 !IL 112	—	—	—	—	—	—	Now IL 159
IL0113 !IL 113	33.95	54.64	IL 47 in Mazon	IL 17 in Kankakee	1924	current
IL0113N !IL 113N	—	—	—	—	1940	1961	Now IL 102
IL0113S !IL 113S	—	—	—	—	1940	1961	Now IL 113
IL0114 !IL 114	7.4	11.9	IL 1/IL 17 in Momence	SR 10 near Lake Village, Indiana	1924	current
IL0115 !IL 115	63.37	101.98	IL 9 in Elliott	US 45/US 52 in Kankakee, Illinois	1924	current
IL0116 !IL 116	176.07	283.36	US 34/IL 94 in Gladstone	US 45 in Ashkum	1924	current
IL0116A !IL 116A	—	—	—	—	—	—	Now IL 117
IL0117 !IL 117	33.85	54.48	I-74 in Goodfield	IL 17 in Toluca	1924	current
IL0118 !IL 118	—	—	—	—	1924	1933	Now IL 23
IL0118 !IL 118	—	—	—	—	1934	1937	Now DuPage CH 7
IL0119 !IL 119	7.78	12.52	US 136/IL 1 west of Alvin	SR 28 east of Alvin	1924	current
IL0120 !IL 120	34.48	55.49	US 14 in Woodstock	IL 131 in Waukegan	1941	current	Formerly IL 20
IL0121 !IL 121	109.48	176.19	IL 130 in Greenup	I-55/IL 10 in Lincoln	1924	current
IL0122 !IL 122	31.53	50.74	IL 29 in Green Valley	IL 9 in Danvers	1924	current
IL0123 !IL 123	33.72	54.27	IL 125 in Pleasant Plains	I-55 in Williamsville	1924	current
IL0124 !IL 124	5.71	9.19	IL 123 in Williamsville	Business I-55 in Sherman	1924	current
IL0125 !IL 125	37.1	59.7	US 67/IL 100 in Beardstown	IL 97 in Pleasant Plains	1924	current
IL0126 !IL 126	17.25	27.76	IL 47 in Yorkville	I-55 in Plainfield	1935	current	Formerly IL 66
IL0127 !IL 127	167.53	269.61	IL 3 in Unity	I-55/IL 48 in Raymond	1924	current
IL0127A !IL 127A	—	—	—	—	—	—	Now IL 143
IL0128 !IL 128	55.57	89.43	I-70 in Altamont	IL 121 in Dalton City	1924	current
IL0129 !IL 129	4.06	6.53	IL 113 in Braidwood	I-55 north of Braidwood	1960	current
IL0130 !IL 130	135.87	218.66	IL 1 in Grayville	I-74 in Urbana	1924	current
IL0130A !IL 130A	5	8	—	—	1930	1942	Newton to Ste. Marie, pulled in 1942^[8]
IL0131 !IL 131	15.15	24.38	IL 176 in Lake Bluff	WIS 31 near Pleasant Prairie, Wisconsin	1938	current
IL0132 !IL 132	13.57	21.84	IL 59 in Fox Lake Hills	IL 131 in Waukegan	1950	current
IL0133 !IL 133	52.05	83.77	IL 32 in Lovington	US 150/IL 1/IL 16 in Paris	1924	current
IL0134 !IL 134	5.62	9.04	US 12/IL 59 in Fox Lake	IL 120 in Hainesville	1950	current
IL0135 !IL 135	20.31	32.69	IL 164 in Kirkwood	US 67 in Alexis	1937	current
IL0136 !IL 136	3.22	5.18	Iowa 136 in Fulton	US 30 east of Fulton	1967	current
IL0137 !IL 137	23.49	37.80	IL 83 in Grayslake	WIS 32 in Winthrop Harbor	1953	current
IL0138 !IL 138	14.95	24.06	IL 159 in Bunker Hill	Illinois Street in Mt. Olive	1942	current
IL0139 !IL 139	—	—	—	—	—	—	Now IL 14
IL0140 !IL 140	52.05	83.77	IL 143 in Alton	US 40 near Mulberry Grove	1935	current
IL0141 !IL 141	18.17	29.24	US 45 north of Texas City	SR 62 east of New Haven	1924	current
IL0142 !IL 142	55.06	88.61	Calhoun Street in Equality	I-57 in Mt. Vernon	1926	current
IL0142A !IL 142A	—	—	—	—	1924	1977	Now IL 242
IL0143 !IL 143	47.96	77.18	US 67 in Alton	IL 127 in Tamalco	1937	current
IL0144 !IL 144	—	—	—	—	1926	1963	Now IL 149
IL0145 !IL 145	43.47	69.96	US 45 in Metropolis	US 45/IL 34 in Harrisburg	1926	current
IL0146 !IL 146	92.93	149.56	MO 34/MO 74 in East Cape Girardeau	IL 1 in Cave-In-Rock	1926	current
IL0147 !IL 147	12.81	20.62	IL 146 in Vienna	IL 145 in Eddyville	1947	current
IL0148 !IL 148	54.85	88.27	IL 37 in Pulleys Mill	IL 37/IL 142 in Mt. Vernon	1926	current
IL0149 !IL 149	45.92	73.90	IL 3 in Gorham	IL 34 in Thompsonville	1926	current	Formerly IL 144
IL0150 !IL 150	24.19	38.93	MO 51 in Chester	IL 154 in Cutler	1926	current
IL0151 !IL 151	7.84	12.62	IL 3 in Jacob	IL 4 in Ava	1940	current
IL0152 !IL 152	6.76	10.88	IL 13/IL 127 in Pyatts	US 51 in Du Quoin	1924	current
IL0153 !IL 153	18.35	29.53	IL 154 in Sparta	IL 15 in Addieville	1926	current
IL0154 !IL 154	63.63	102.40	IL 3/IL 159 in Red Bud	IL 37 in Whittington	1926	current
IL0155 !IL 155	10.81	17.40	Fort de Chartres State Historical Site	IL 3 in Ruma	1924	current
IL0156 !IL 156	22.95	36.93	South Meyer Avenue/C Road in Valmeyer	IL 13 in New Athens	1926	current
IL0157 !IL 157	33.50	53.91	IL 3 in Cahokia	IL 140 in Hamel	1926	current
IL0158 !IL 158	25.81	41.54	IL 3 in Columbia	I-64/US 50 in O'Fallon	1926	current
IL0159 !IL 159	64.90	104.45	IL 3/IL 154 in Red Bud	IL 16 in Royal Lakes	1926	current
IL0160 !IL 160	46.06	74.13	IL 15 in Addieville	IL 140 in Alhambra	1959	current
IL0161 !IL 161	67.24	108.21	St. Clair Avenue in Fairview Heights	IL 37 in Kell	1926	current
IL0162 !IL 162	16.36	26.33	IL 203 in Granite City	US 40 in Troy	1954	current
IL0163 !IL 163	9.89	15.92	IL 158 in Millstadt	IL 15 in Alorton	1954	current
IL0164 !IL 164	35.70	57.45	US 34 in Gladstone	US 34/IL 41/IL 110 (CKC) in Galesburg	1937	current
IL0165 !IL 165	29.64	47.70	IL 9 in Merna	IL 47 in Sibley	1924	current
IL0166 !IL 166	14.43	23.22	US 45 in New Burnside	IL 13 in Pittsburg	1924	current
IL0167 !IL 167	12.24	19.70	US 34 in Wataga	IL 180 in Victoria, Illinois	1924	current
IL0168 !IL 168	—	—	—	—	—	—	Now IL 97
IL0169 !IL 169	9.04	14.55	IL 37 in Karnak	US 45 in New Columbia	1949	current
IL0170 !IL 170	25	40	IL 23 in Cornell	US 6 in Seneca, Illinois	1946	current	Formerly IL 70A and IL 186
IL0171 !IL 171	38.61	62.14	US 6 in Joliet	IL 72 in Chicago	1946	current	Formerly IL 4A and IL 213
IL0172 !IL 172	13.06	21.02	IL 92 in Yorktown	IL 40 in Tampico	1946	current
IL0173 !IL 173	66.20	106.54	IL 251 in Machesney Park	IL 137 in Zion	1924	current
IL0174 !IL 174	5.3	8.5	IL 88 in Peoria	IL 91 west of Alta	1924	1983
IL0175 !IL 175	2	3	US 24/IL 9 near Glasford	Glasford	1924	1935
IL0176 !IL 176	41.28	66.43	IL 23 in Marengo	IL 131 in Lake Bluff	1926	current	Formerly IL 67
IL0177 !IL 177	47.59	76.59	IL 13/IL 158/IL 159 in Belleville	US 51 in Irvington	1924	current
IL0178 !IL 178	8.49	13.66	Ed Lambert Road in Lowell	I-80 in North Utica	1924	current
IL0179 !IL 179	16.3	26.2	IL 251 near Rutland	IL 18 near Streator	1935	1995
IL0180 !IL 180	15.43	24.83	US 150 in Williamsfield	IL 17 in Victoria	1924	current
IL0181 !IL 181	—	—	—	—	—	—	Now IL 33
IL0182 !IL 182	—	—	—	—	—	—	Now IL 161
IL0183 !IL 183	—	—	—	—	—	—	Now IL 154
IL0184 !IL 184	5.87	9.45	IL 149 in Royalton	IL 14 in Mulkeytown	1924	current
IL0185 !IL 185	49.88	80.27	IL 127 in Taylor Springs	IL 37 in Farina	1924	current
IL0186 !IL 186	—	—	—	—	1938	1945	Now IL 170
IL0190 !IL 190	—	—	—	—	—	—	Now I-88
IL0192 !IL 192	8.31	13.37	IL 92 in Illinois City	IL 94 in Taylor Ridge	1955	current
IL0194 !IL 194	—	—	—	—	1960	1978	Now I-90/I-94 in Chicago
IL0199 !IL 199	—	—	—	—	—	—	Now IL 92
IL0203 !IL 203	9.51	15.30	Collinsville Road in Fairmont City	I-270 in Granite City	1964	current
IL0213 !IL 213	—	—	—	—	—	—	Now IL 171
IL0226 !IL 226	—	—	—	—	—	—	Now IL 172
IL0242 !IL 242	18.67	30.05	IL 142 in McLeansboro	IL 15 in Wayne City	1924	current	Formerly IL 142A
IL0250 !IL 250	33.44	53.82	US 50 in Noble	Business US 50 in Lawrenceville	1965	current
IL0251 !IL 251	135.32	217.78	I-39/US 51 in Hudson	US 51/IL 75 in South Beloit	1982	current
IL0255 !IL 255	23.3	37.5	I-255/I-270 in Pontoon Beach	US 67 in Godfrey	1998	current
IL0267 !IL 267	59	95	US 67/IL 111 in Godfrey	Business I-72/Business US 67/IL 104 in Jacksonville	1965	current
IL0316 !IL 316	—	—	—	—	—	—	Now IL 16
IL0336 !IL 336	80	129	I-172/US 24/IL 110 (CKC) in Quincy	US 136/IL 110 (CKC) in Macomb	1990	current
IL0351 !IL 351	8.55	13.76	IL 71/IL 251 in Oglesby	I-80 in LaSalle	1966	current
IL0390 !IL 390	6.01	9.67	US 20 in Hanover Park	I-290 in Elk Grove Village	2013	current	Formerly the Elgin–O'Hare Expressway
IL0394 !IL 394	14.63	23.54	IL 1 in Crete	I-80/I-94/I-294 in South Holland	1956	current
IL0594 !IL 594	—	—	—	—	1971	1978	Now I-190
Former

Inventory routes

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.^[9]

Unnumbered routes

Some routes in Illinois are state maintained, but not numbered.^[10]

25th Avenue
Barrington Road
Cermak Road
Lake Cook Road
Palatine Road
Pershing Road
Raritan Road
Wolf Road

Some old alignments of routes are state maintained, but are not signed. They still may, however, have an unsigned designation.^[11]

References

↑ 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.
1 2 3 4 Carlson, Richard (March 15, 2005). "Illinois Highway Trivia". Illinois Highways Page. Retrieved January 1, 2016.
↑ Carlson, Richard (October 29, 2013). "Routes 200 and up". Illinois Highways Page. Retrieved January 1, 2016.
↑ Carlson, Richard (August 15, 2010). "Routes 101 thru 120". Illinois Highways Page. Retrieved January 1, 2016.
↑ http://www.n9jig.com/busn.html
↑ Carlson, Richard (December 21, 2014). "Routes 41 thru 60". Illinois Highways Page. Retrieved January 1, 2016.
↑ Carlson, Richard (April 15, 2009). "Routes 61 thru 80". Illinois Highways Page. Retrieved January 1, 2016.
↑ Carlson, Richard (August 31, 2009). "Routes 121 thru 140". Illinois Highways Page. Retrieved January 1, 2016.
↑ http://www.n9jig.com/trivia.html
↑ 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.
↑ Burmaster, Bill. "Illinois State I.D. Routes". Roads of the Mid-South & West. Retrieved April 25, 2014.

External links

Illinois Highways Page

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