Fatal crashes in Williamson County, Illinois
In 2024, 10 people died in 10 fatal crashes in Williamson County, 100.0% more than in 2023. From 2015 to 2024 the county recorded 95 fatal crashes and 106 deaths, the 20th most of any county in Illinois.
14.9 deaths per 100,000 residents, against 9.3 across Illinois in 2024; 15.8 against 9 a year over 2015 to 2024. Population 67,064, Census Bureau estimate. All fatal crashes in Illinois.
Deaths in Williamson County by year
| Year | Fatal crashes | Deaths |
|---|---|---|
| 2024 | 10 | 10 |
| 2023 | 5 | 5 |
| 2022 | 11 | 13 |
| 2021 | 9 | 9 |
| 2020 | 9 | 11 |
| 2019 | 7 | 7 |
| 2018 | 14 | 17 |
| 2017 | 11 | 12 |
| 2016 | 9 | 11 |
| 2015 | 10 | 11 |
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
The deadliest roads in Williamson County
State Highway 13 had the most fatal crashes of any numbered road in Williamson County from 2015 to 2024: 19, with 20 deaths. The 4 roads listed held 54% of all fatal crashes in Williamson County from 2015 to 2024; 1 is an interstate, 3 state highways. Interstate, US and state routes with 5 or more fatal crashes in the county; county roads and city streets are in the county's total but not listed.
| Road | Fatal crashes | Deaths | 2022 to 2024 | ||
|---|---|---|---|---|---|
| 1 | State Highway 13 | 19 | 20 | 3 | |
| 2 | I-57 | 15 | 18 | 4 | |
| 3 | State Highway 148 | 10 | 12 | 2 | no page |
| 4 | State Highway 37 | 7 | 9 | 3 |
Cities NHTSA filed, with their fatal crashes from 2015 to 2024: Marion 20, Herrin 8. The city is not filed for crashes outside a city.
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
When fatal crashes happen in Williamson County
Too few crashes to name a heaviest slot. The grid shows the shares; a share is only given over 20 crashes.
| Midnight to 4 | 4 to 8 am | 8 to noon | Noon to 4 | 4 to 8 pm | 8 to midnight | |
|---|---|---|---|---|---|---|
| Sun | 4.2 percent, 4 fatal crashes | 3.2 percent, 3 fatal crashes | 0.0 percent, 0 fatal crashes | 2.1 percent, 2 fatal crashes | 3.2 percent, 3 fatal crashes | 5.3 percent, 5 fatal crashes |
| Mon | 3.2 percent, 3 fatal crashes | 1.1 percent, 1 fatal crashes | 1.1 percent, 1 fatal crashes | 2.1 percent, 2 fatal crashes | 0.0 percent, 0 fatal crashes | 3.2 percent, 3 fatal crashes |
| Tue | 2.1 percent, 2 fatal crashes | 1.1 percent, 1 fatal crashes | 2.1 percent, 2 fatal crashes | 2.1 percent, 2 fatal crashes | 3.2 percent, 3 fatal crashes | 4.2 percent, 4 fatal crashes |
| Wed | 0.0 percent, 0 fatal crashes | 1.1 percent, 1 fatal crashes | 4.2 percent, 4 fatal crashes | 2.1 percent, 2 fatal crashes | 2.1 percent, 2 fatal crashes | 4.2 percent, 4 fatal crashes |
| Thu | 0.0 percent, 0 fatal crashes | 4.2 percent, 4 fatal crashes | 2.1 percent, 2 fatal crashes | 2.1 percent, 2 fatal crashes | 2.1 percent, 2 fatal crashes | 6.3 percent, 6 fatal crashes |
| Fri | 0.0 percent, 0 fatal crashes | 2.1 percent, 2 fatal crashes | 3.2 percent, 3 fatal crashes | 9.5 percent, 9 fatal crashes | 1.1 percent, 1 fatal crashes | 0.0 percent, 0 fatal crashes |
| Sat | 1.1 percent, 1 fatal crashes | 0.0 percent, 0 fatal crashes | 2.1 percent, 2 fatal crashes | 3.2 percent, 3 fatal crashes | 2.1 percent, 2 fatal crashes | 2.1 percent, 2 fatal crashes |
By hour
By month
- Jan5.3%
- Feb6.3%
- Mar5.3%
- Apr12.6%
- May7.4%
- Jun11.6%
- Jul13.7%
- Aug8.4%
- Sep7.4%
- Oct12.6%
- Nov4.2%
- Dec5.3%
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
What fatal crashes in Williamson County first hit
The first harmful event was a collision with another vehicle in 43%; a fixed object such as a tree, pole or barrier in 22%, a pedestrian in 14%, a rollover in 14%.
| First harmful event | Fatal crashes | Share |
|---|---|---|
| Collision with another vehicle | 41 | 43% |
| Fixed object (tree, pole, barrier, ditch) | 21 | 22% |
| Pedestrian | 13 | 14% |
| Rollover | 13 | 14% |
| Cyclist | 3 | 3.2% |
| Other | 3 | 3.2% |
| Parked vehicle | 1 | 1.1% |
| Not reported | 0 | 0.0% |
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
How fatal crashes in Williamson County compare with Illinois
A drinking driver was recorded in 24% of fatal crashes in Williamson County from 2015 to 2024, below the Illinois share of 27%; speeding in 31%, below the Illinois share of 37%; a hit-and-run in 3.2%, below the Illinois share of 8.4%; a driver recorded as distracted in 3.2%, below the Illinois share of 9.8%; 46% of passenger-vehicle occupants killed with belt use known were unbelted, about the Illinois share. Shares of fatal crashes from 2015 to 2024, against the share across all of Illinois. A share is only given over 20 crashes.
| Williamson | Illinois | ||
|---|---|---|---|
| On rural roads | 73% | 34% | above the Illinois share |
| At or near an intersection | 28% | 30% | below the Illinois share |
| In the dark, road unlit | 38% | 25% | above the Illinois share |
| A drinking driver | 24% | 27% | below the Illinois share |
| Speeding | 31% | 37% | below the Illinois share |
| A distracted driver (as recorded) | 3.2% | 9.8% | below the Illinois share |
| Occupants killed unbelted | 46% | 46% | about the same as the Illinois share |
| Hit-and-run | 3.2% | 8.4% | below the Illinois share |
| A motorcycle involved | 14% | 14% | about the same as the Illinois share |
| Pedestrians among the dead | 12% | 16% | below the Illinois share |
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
Questions about fatal crashes in Williamson County
- How many people died in car accidents in Williamson County in 2024?
- 10 people died in 10 fatal crashes in Williamson County, Illinois, in 2024, 100.0% more than in 2023. That is 14.9 deaths per 100,000 residents, against 9.3 across Illinois.
- What is the deadliest road in Williamson County?
- State Highway 13 had the most fatal crashes of any numbered road in Williamson County from 2015 to 2024: 19, with 20 deaths.
- How many fatal crashes in Williamson County involved a drinking driver?
- 23 of 95 fatal crashes in Williamson County from 2015 to 2024 involved a driver NHTSA recorded as drinking, 24%, against 27% across Illinois.
Other counties in Illinois with a page
- Cook County
- Will County
- Lake County
- DuPage County
- St. Clair County
- Madison County
- Kane County
- Winnebago County
- Sangamon County
- McHenry County
- LaSalle County
- Peoria County
All fatal crashes in Illinois, with every county ranked.
Where the Williamson County numbers come from
Counted from NHTSA's Fatality Analysis Reporting System, 2024 Annual Report File: every fatal crash NHTSA filed in Williamson County (county code 199). A fatal crash is one in which someone died within 30 days. The rate per 100,000 uses the Census Bureau's population estimate for the county; it is the only figure here not counted from FARS. The full method.