Williamson County, Illinois: fatal crash statistics

Counties of Illinois by year (CSV)Cite this page

FARS records 10 deaths in 10 fatal crashes in Williamson County in 2024.

FARS records 106 deaths in 95 fatal crashes in the county from 2015 to 2024.

From 2015 to 2024 the rate is 15.8 deaths for each 100,000 residents in a year.

The rate of Illinois in the same years is 9.0.

By deaths from 2015 to 2024, Williamson County was number 20 of 102 counties of Illinois.

Deaths in Williamson County fell by 11.7% between the ten years 2005 to 2014 (120) and the ten years 2015 to 2024 (106).

In the counties of Illinois the deaths rose by 8.4% between the same years.

From 2015 to 2024, 73.4% of the fatal crashes in Williamson County with a known setting were rural, against 33.6% in Illinois.

To qualify as a FARS case, the crash had to involve a motor vehicle traveling on a trafficway customarily open to the public and must have resulted in the death of a motorist or a non-motorist within 30 days of the crash.
The set of first files, known as the Annual Report File (ARF), is released following the crash year. The ARF is replaced about a year later with a final file, which contains additional cases or updates to cases that had become available after the ARF was released.
NHTSA's words. Source: NHTSA, Fatality Analysis Reporting System Analytical User's Manual, 1975-2024 (DOT HS 813 794, April 2026), copied on 2 Oct 2026.

This page rests on the FARS 2024 annual file. NHTSA released it on 1 Apr 2026. NHTSA can revise the counts in the final file. Release dates

Figure 1.Deaths in Williamson County by year, 2015 to 2024

Table 1 has the numbers. Go to the table

Since the last update: no figure of this county has a change on record.

Deaths and fatal crashes by year

Table 1.Williamson County: deaths and fatal crashes by year, 2015 to 2024
Year	Deaths	Fatal crashes	Crashes with a driver recorded as drinking
2024	10	10	3
2023	5	5	1 or 2
2022	13	11	1 or 2
2021	9	9	1 or 2
2020	11	9	1 or 2
2019	7	7	3
2018	17	14	3
2017	12	11	5
2016	11	9	1 or 2
2015	11	10	3
2015 to 2024	106	95	23

Each year from 1975

Figure 2.Deaths in Williamson County by year, 1975 to 2024

Tallest column: 22 (1980)2024: 10

The columns with a stronger shade are the years 2015 to 2024.

Table 2.Williamson County: deaths and fatal crashes by year, 1975 to 2024
Year	Deaths	Fatal crashes
2024	10	10
2023	5	5
2022	13	11
2021	9	9
2020	11	9
2019	7	7
2018	17	14
2017	12	11
2016	11	9
2015	11	10
2014	10	7
2013	8	8
2012	11	10
2011	13	12
2010	5	5
2009	8	8
2008	19	16
2007	9	9
2006	19	14
2005	18	15
2004	16	12
2003	14	12
2002	15	15
2001	15	15
2000	15	11
1999	13	13
1998	8	8
1997	13	11
1996	11	9
1995	8	8
1994	9	9
1993	15	8
1992	21	20
1991	11	10
1990	16	11
1989	7	7
1988	18	13
1987	14	12
1986	20	17
1985	20	14
1984	17	16
1983	10	9
1982	11	11
1981	13	13
1980	22	20
1979	19	16
1978	15	13
1977	5	5
1976	16	15
1975	16	14

Note: a count of 1 or 2 is written "1 or 2". A death is in FARS when it occurs in 30 days or less after the crash.

Rate for each 100,000 residents

Table 3.Williamson County beside Illinois and the United States: deaths for each 100,000 residents
Period	Williamson County	Illinois	United States
2024	14.9	9.3	11.5
2015 to 2024, in a year	15.8	9.0	11.8

Note: the rate divides the deaths in the county by its residents. Persons who do not live in the county are in the deaths, not in the residents.

Population: Census Bureau estimates, vintage 2025. Williamson County had 67,074 residents in 2024.

Factors that NHTSA records

Table 4.Williamson County: counts by recorded factor, 2015 to 2024
Factor	Count	Counted among	Share	Share in Illinois
A driver recorded as drinkingof 95 fatal crashes	23	95 fatal crashes	24.2%	27.2%
A speeding-related driverof 95 fatal crashes	29	95 fatal crashes	30.5%	36.5%
No restraint usedof 68 occupant deaths with restraint use known	31	68 occupant deathswith restraint use known	45.6%	46.8%
Pedestriansof 106 deaths	13	106 deaths	12.3%	15.5%
Bicyclistsof 106 deaths	3	106 deaths	2.8%	2.5%
Motorcyclistsof 106 deaths	14	106 deaths	13.2%	13.3%
On a rural roadof 94 fatal crashes with the condition reported	69	94 fatal crasheswith the condition reported	73.4%	33.6%
In the darkof 95 fatal crashes with the condition reported	45	95 fatal crasheswith the condition reported	47.4%	48.7%

Note: FARS records a driver as drinking when police reported alcohol involvement or a test of the driver was positive for alcohol. It is not NHTSA's alcohol-impaired measure, which uses a blood alcohol concentration of .08 g/dL or higher. One crash can be in two or more rows. NHTSA's definitions

Note that alcohol data is often missing. For that reason, this data element may under-count the actual number of drinking drivers.

NHTSA's words. Source: NHTSA, Fatality Analysis Reporting System Analytical User's Manual, 1975-2024 (DOT HS 813 794, April 2026), copied on 2 Oct 2026.

Weekday, time and road class

Table 5.Williamson County: fatal crashes by weekday and time of day, 2015 to 2024
Weekday	Midnight to 6 a.m.	6 a.m. to noon	Noon to 6 p.m.	6 p.m. to midnight	All
Sunday	5	1 or 2	4	6	17
Monday	3	1 or 2	1 or 2	3	10
Tuesday	3	1 or 2	4	5	14
Wednesday	1 or 2	4	3	5	13
Thursday	1 or 2	5	3	7	16
Friday	1 or 2	4	10	0	15
Saturday	1 or 2	1 or 2	3	4	10
All days	15	21	29	30	95

Note: a cell with a stronger shade has a larger count. The table has the fatal crashes with a known hour and weekday.

Table 6.Williamson County: fatal crashes by road function class, 2015 to 2024
Road function class	Fatal crashes	Share	Share in Illinois
Interstate	16	17.0%	14.2%
Other freeways and expressways	0	0.0%	0.7%
Other principal arterial	22	23.4%	29.1%
Minor arterial	22	23.4%	24.5%
Major collector	17	18.1%	17.0%
Minor collector	4	4.3%	2.0%
Local	13	13.8%	12.5%
Not reported	1 or 2	n/a	n/a

Note: the classes are those of the Federal Highway Administration. The shares are of the crashes with a reported class. Road function classes

Light condition and weather

Table 7.Williamson County: fatal crashes by light condition, 2015 to 2024
Light condition	Fatal crashes
Daylight	48
Dark, not lighted	36
Dark, lighted	7
Dawn	1 or 2
Dusk	1 or 2
Dark, lighting unknown	1 or 2
Other or unknown	0

Table 8.Williamson County: fatal crashes by weather, 2015 to 2024
Weather	Fatal crashes
Clear	79
Cloudy	1 or 2
Rain	12
Snow, sleet or freezing rain	1 or 2
Fog, smog or smoke	1 or 2
Crosswinds or blowing sand/snow	0
Other or not reported	1 or 2

Routes in the county

Table 9.Signed routes in Williamson County that have a page: fatal crashes, 2015 to 2024
Route	Type	In Williamson	In all of Illinois
Interstate 57	Interstate	15	223
State Route 13	State highway	19	57
State Route 37	State highway	7	43

Note: the table has each route with a page that has a fatal crash in the county, in name order. Local streets and county roads have no page. Their crashes are in the county totals. All routes in Illinois

Adjacent counties

These lists are for navigation. They are in name order.

Figure 3.Williamson County on the county map of Illinois

Deaths for each 100,000 residents in a year, 2015 to 2024

Fewer than 1016 counties
10 to 14.926 counties
15 to 19.927 counties
20 to 29.928 counties
30 or more5 counties
Williamson County: 15.8

The limits of the classes are the same for every state. A county with few residents can show a high rate from few deaths. A class is not a judgement of a county. The full map and the table of counties of Illinois

Table 10.Counties that share a boundary line with Williamson County
County	State	Deaths, 2024	Deaths, 2015 to 2024	For each 100,000 residents in a year
Franklin County	Illinois	3	79	20.7
Jackson County	Illinois	13	93	16.8
Johnson County	Illinois	1 or 2	24	18.6
Saline County	Illinois	4	41	17.4
Union County	Illinois	4	42	24.7

Source of the list: Census Bureau county adjacency file, 2026 edition.

Counties of similar population

These counties of Illinois have a population nearest to that of Williamson County. The list is for navigation and is in name order. The number is the deaths from 2015 to 2024.

Official channels

NHTSA Fatality and Injury Reporting System Tool (FIRST)NHTSA's query tool for FARS counts.
NHTSA FARS EncyclopediaNHTSA's tables of FARS data.
Illinois Department of TransportationThe highway safety office of Illinois.

These links go to the sites of the agencies. They were checked on 2 Oct 2026.

Cite this page

Fatal Roads. Williamson County, Illinois: fatal crash statistics. https://fatalroads.com/county/il/williamson/. Source: National Highway Traffic Safety Administration, Fatality Analysis Reporting System, FARS 2024 annual file. Data to 31 Dec 2024.

The address of this page does not change.

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Source of the figures

Counts: National Highway Traffic Safety Administration, Fatality Analysis Reporting System, national files of 1975 to 2024. The factors use the vehicle and person files from 2015. Residents: Census Bureau, Population Estimates Program, vintage 2025. Map: Census Bureau cartographic boundary file, 2021 edition. Data to 31 Dec 2024. The figures are totals. No page of this site is about one crash or one person.

How the figures are made. Data sources and licences. Corrections.

Questions

How many deaths did FARS record in Williamson in the ten years before 2015?

FARS records 120 deaths in Williamson County from 2005 to 2014. It records 106 deaths from 2015 to 2024.

What was the rate of Williamson in 2024?

The rate of Williamson County in 2024 was 14.9 deaths for each 100,000 residents. The rate of Illinois was 9.3. The rate of the United States was 11.5.

How many fatal crashes in Williamson had a driver recorded as drinking?

FARS records a driver as drinking in 23 of 95 fatal crashes from 2015 to 2024. This count is not NHTSA's alcohol-impaired measure. NHTSA says that alcohol data is often missing, so the count may be too low.

How many fatal crashes did FARS record on signed routes in Williamson?

FARS records 15 fatal crashes on Interstate 57 in the county from 2015 to 2024. FARS records 19 fatal crashes on State Route 13 in the county from 2015 to 2024. FARS records 7 fatal crashes on State Route 37 in the county from 2015 to 2024.