What is the deadliest road in Illinois?

I-55 had the most fatal crashes of any numbered road in Illinois from 2015 to 2024: 251, with 285 deaths. I-57 was second with 216 and I-94 third with 154. Source: NHTSA's Fatality Analysis Reporting System (FARS).

Which interstate in Illinois is the most dangerous per mile?

I-94, with 25.9 fatal crashes a year per 100 miles over 2015 to 2024 on 60 miles. That is crashes per mile of road, not per vehicle.

How many fatal crashes in Illinois happen on numbered roads?

5,202 of 10,472 fatal crashes in Illinois from 2015 to 2024 (50%) were filed on an interstate, US or state route; the rest were on county roads, city streets and unnamed roads, which are in the state's total but not ranked here.

The deadliest roads in Illinois

I-55 had the most fatal crashes of any numbered road in Illinois from 2015 to 2024: 251, with 285 deaths. The 60 roads listed held 38% of all fatal crashes in Illinois from 2015 to 2024; 13 are interstates, 16 US routes, 31 state highways.

212 numbered roads in Illinois recorded a fatal crash in those years; the 60 with 5 or more are ranked below, and 36 have a page of their own. All fatal crashes in Illinois.

Every numbered road in Illinois, ranked by fatal crashes

	Road	Kind	Fatal crashes	Deaths	2022 to 2024	Counties with the most
1	I-55	Interstate	251	285	83	Will, Cook, McLean
2	I-57	Interstate	216	257	64	Cook, Champaign, Jefferson
3	I-94	Interstate	154	164	54	Cook, Lake
4	US 45	US route	130	148	49	Kankakee, Champaign, Saline
5	I-80	Interstate	127	149	28	Will, Cook, Grundy
6	State Highway 83	State highway	119	128	39	Cook, DuPage, Lake
7	State Highway 1	State highway	111	129	42	Cook, Kankakee, Will
8	State Highway 50	State highway	106	112	42	Cook, Kankakee, Will
9	US 20	US route	105	118	32	Winnebago, Cook, Jo Daviess
10	US 30	US route	101	114	40	Cook, Will, Whiteside
11	I-90	Interstate	101	112	45	Cook, Kane, Boone
12	US 41	US route	96	104	36	Cook, Lake
13	US 12	US route	90	100	28	Cook, Lake, McHenry
14	State Highway 3	State highway	90	99	35	St. Clair, Madison, Monroe
15	I-74	Interstate	86	95	29	Vermilion, Peoria, McLean
16	I-290	Interstate	82	98	20	Cook, DuPage
17	US 6	US route	75	80	22	Cook, Will, LaSalle
18	State Highway 43	State highway	71	80	23	Cook, Lake
19	State Highway 64	State highway	71	75	25	Cook, DuPage, Kane
20	I-70	Interstate	70	78	23	Effingham, Fayette, Madison
21	US 51	US route	68	74	23	Jackson, McLean, Macon
22	US 34	US route	67	74	22	DuPage, Knox, LaSalle
23	US 150	US route	66	68	18	Vermilion, Champaign, Knox
24	I-294	Interstate	66	67	20	Cook
25	State Highway 29	State highway	58	64	21	Sangamon, Peoria, Christian
26	US 24	US route	57	70	18	Adams, Peoria, Tazewell
27	State Highway 13	State highway	57	63	18	Williamson, Jackson, St. Clair
28	US 50	US route	55	68	18	Lawrence, Clinton, St. Clair
29	I-64	Interstate	54	59	14	St. Clair, Jefferson, Washington
30	US 67	US route	52	55	12	Madison, Greene, Jersey
31	State Highway 47	State highway	50	55	19	Grundy, Kendall, Kane
32	I-88	Interstate	49	56	20	DuPage, Kane, DeKalb
33	State Highway 171	State highway	47	52	17	Cook, Will
34	State Highway 59	State highway	47	50	11	DuPage, Cook, Lake
35	State Highway 15	State highway	46	52	18	St. Clair, Washington, Jefferson
36	State Highway 53	State highway	46	52	15	Will, DuPage, Cook
37	State Highway 251	State highway	45	48	10	Winnebago, LaSalle, Ogle
38	State Highway 4	State highway	44	52	13	Madison, Sangamon, St. Clair
39	State Highway 37	State highway	43	49	16	Marion, Jefferson, Franklin
40	State Highway 23	State highway	43	48	15	DeKalb, LaSalle, McHenry
41	US 14	US route	42	48	16	Cook, McHenry, Lake
42	US 52	US route	42	47	11	Will, LaSalle, Iroquois
43	State Highway 31	State highway	40	44	13	Kane, McHenry, Kendall
44	State Highway 72	State highway	40	43	14	Cook, Kane, Ogle
45	State Highway 40	State highway	39	42	12	Peoria, Whiteside, Bureau
46	State Highway 16	State highway	39	41	12	Montgomery, Coles, Shelby
47	State Highway 38	State highway	39	41	13	DuPage, Kane, DeKalb
48	State Highway 111	State highway	38	41	12	Madison, Macoupin, St. Clair
49	State Highway 17	State highway	38	40	12	Kankakee, Livingston, Stark
50	State Highway 19	State highway	38	40	9	Cook, DuPage, Kane
51	State Highway 2	State highway	37	39	11	Winnebago, Ogle, Lee
52	US 40	US route	34	43	10	Fayette, Effingham, Madison
53	I-39	Interstate	33	39	10	Winnebago, LaSalle, McLean
54	State Highway 173	State highway	31	32	10	Lake, McHenry, Boone
55	State Highway 127	State highway	30	36	7	Bond, Washington, Union
56	State Highway 130	State highway	30	36	12	Richland, Coles, Champaign
57	State Highway 161	State highway	28	31	10	St. Clair, Clinton, Marion
58	US 136	US route	28	30	10	Fulton, Vermilion, McLean
59	State Highway 121	State highway	28	29	12	Macon, Moultrie, Logan
60	I-72	Interstate	27	32	6	Sangamon, Pike, Macon

Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count

Download every numbered road in Illinois as CSV. Free to reuse with credit: “Fatal Crash Data, fatalcrashdata.com/deadliest-roads/illinois/, from NHTSA FARS (2024 Annual Report File).”

Interstates in Illinois per mile

Fatal crashes a year per 100 miles of road, 2015 to 2024, for interstates with 20 miles or more in Illinois. Crashes per mile of road, not per vehicle. Mileage from the FHWA Interstate route log.

	Road	Per 100 miles a year	Fatal crashes	Miles
1	I-94	25.9	154	60
2	I-90	11.1	101	91
3	I-55	8.5	251	294
4	I-80	7.8	127	164
5	I-57	6.0	216	359
6	I-70	5.0	70	139
7	I-74	4.0	86	215
8	I-88	3.5	49	141

Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count

Questions about the deadliest roads in Illinois

What is the deadliest road in Illinois?: I-55 had the most fatal crashes of any numbered road in Illinois from 2015 to 2024: 251, with 285 deaths. I-57 was second with 216 and I-94 third with 154. Source: NHTSA's Fatality Analysis Reporting System (FARS).
Which interstate in Illinois is the most dangerous per mile?: I-94, with 25.9 fatal crashes a year per 100 miles over 2015 to 2024 on 60 miles. That is crashes per mile of road, not per vehicle.
How many fatal crashes in Illinois happen on numbered roads?: 5,202 of 10,472 fatal crashes in Illinois from 2015 to 2024 (50%) were filed on an interstate, US or state route; the rest were on county roads, city streets and unnamed roads, which are in the state's total but not ranked here.

Where the Illinois road numbers come from

Counted from NHTSA's Fatality Analysis Reporting System, 2024 Annual Report File: every fatal crash filed on a numbered interstate, US or state route in Illinois, read from the road name NHTSA filed, with ramps, frontage and service roads left out. A road gets its own page with 15 or more fatal crashes from 2022 to 2024. The full method.