Fatal crashes in Williamson County, Illinois
In 2024, 10 people died in 10 fatal crashes in Williamson County, Illinois, up from 5 in 2023. From 2015 to 2024 the county recorded 95 fatal crashes and 106 deaths, the 20th most of 102 counties 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. 60% of the county's fatal crashes were on an interstate, US or state route; the other 40% were on county roads and city streets. Routes are listed from 5 fatal crashes.
| 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 |
Marion had 21% of the county's fatal crashes from 2015 to 2024, 20 of 95.
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
95 fatal crashes in Williamson County, Illinois from 2015 to 2024 have a known time, too few for any one weekday and time of day to stand out. The worst hour is 9 pm to 10 pm; the worst month is July.
| 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 crash | 1.1 percent, 1 fatal crash | 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 crash | 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 crash | 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 crash | 0.0 percent, 0 fatal crashes |
| Sat | 1.1 percent, 1 fatal crash | 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
The largest difference from Illinois: from 2015 to 2024, 73% of fatal crashes in Williamson County were on rural roads, against 34% across Illinois. Also above the Illinois share: unlit roads at night. Below it: distracted drivers. Shares of fatal crashes from 2015 to 2024, against the share across all of Illinois. A share is only given over 20 crashes; above or below means more than chance would give on 95 crashes.
| Williamson | Illinois | ||
|---|---|---|---|
| On rural roads | 73% | 34% | above the Illinois share |
| At or near an intersection | 28% | 30% | about the same as the Illinois share |
| In the dark, road unlit | 38% | 25% | above the Illinois share |
| A drinking driver | 24% | 27% | about the same as the Illinois share |
| Speeding | 31% | 37% | about the same as 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% | about the same as the Illinois share |
| A motorcycle involved | 14% | 14% | about the same as the Illinois share |
| Pedestrians among the dead | 12% | 16% | about the same as 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, Illinois
- 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, up from 5 in 2023. That is 14.9 deaths per 100,000 residents, against 9.3 across Illinois. Source: NHTSA's Fatality Analysis Reporting System (FARS).
- 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. Totals from state highway departments and news reports can differ: they count from their own crash reports, often before every death within 30 days is known, while NHTSA's file is checked against death certificates and revised once a year. The full method.
Download every county with a page as CSV. Free to reuse with credit: “Fatal Crash Data, fatalcrashdata.com/fatal-crashes/illinois/williamson-county/, from NHTSA FARS (2024 Annual Report File).”