How many traffic fatalities occurred in St. Clair County, Illinois?

St. Clair County recorded 287 total traffic fatalities across 272 reported crashes over the data period (2016-2023). The most recent year saw 36 fatalities. The county averages approximately 31.9 fatalities per year.

What is the leading cause of road fatalities in St. Clair County?

Despite a comparatively active crash history (272 recorded crashes), individual cause-code breakdowns are not published for St. Clair County in the current FARS release. Statewide data for Illinois may provide additional context.

Is the trend of road fatalities in St. Clair County increasing or decreasing?

The trend in St. Clair County is increasing. This indicates that traffic fatalities have risen over the data period, warranting attention to road safety initiatives.

What is the fatality rate per capita in St. Clair County?

St. Clair County has a fatality rate of 14.3 per 100,000 residents, which places it close to the national middle by that per-capita measure among the 3,137 U.S. counties in this dataset.

How does St. Clair County compare to the rest of Illinois?

St. Clair County's per-capita rate of 14.3 per 100,000 residents is below the Illinois county average of 19.0. Visit the Illinois state page for the full county-by-county breakdown.

Where does the road fatality data for St. Clair County come from?

All road fatality data comes from the NHTSA Fatality Analysis Reporting System (FARS), a census of fatal motor vehicle crashes on public roads in the United States. FARS data covers the period 2016-2023 and includes all crashes resulting in at least one fatality within 30 days.

COUNTY FATALITY DATA

St. Clair County, Illinois

Road fatality data for St. Clair County (IL). Data period: 2016-2023.

Compiled by PlainRoadSafety · August 9, 2026

287
Total Fatalities (2016-2023): 36
Latest Year Deaths: 14.3
Per 100k Residents: Increasing
Trend

The verdict

According to the National Highway Traffic Safety Administration Fatality Analysis Reporting System, St. Clair County ranks #1,333 of 2,328 U.S. counties by road-fatality rate per 100,000 residents (highest first) and #48 of 81 rated counties in IL. St. Clair County's fatality rate of 14.3 per 100,000 residents places it close to the national middle by that per-capita measure.

#1,333 of 2,328
national by fatality rate: #48 of 81
in IL by rate: 57%
of rated U.S. counties are deadlier per capita: Increasing
fatality trend

FARS county milepost

Milepost ST-CLAIR-163 · St. Clair 14.3/100k · #1,333 of 2,328

St. Clair County · 14.3/100k · increasing · cause n/a

RATE 14.3/100k
RANK #1,333 of 2,328
BOOK 287 book
TREND Increasing
CAUSE near Atlantic
PHOTO -24.8% vs IL

Stamps derive from this county's NHTSA FARS row (per-100k or book, corpus rank, trend, nationwide peer NAME, vs-state gap), not a trip-risk forecast. PlainRoadSafety is informational only. See our disclaimer. Verify with NHTSA FARS → · Read with methodology → · Understanding road fatality data → · Illinois state profile →

Richland

14
St. Clair

14
Atlantic

15
St. Tammany

15
Lee

15

What this shows St. Clair County sits among nearest nationwide per-capita peers.

How does St. Clair County compare?

2023 road deaths per 100,000 residents. Choose any comparison from the menu.

Compare with

St. Clair County

14.3 per 100k

Illinois county average

19.0 per 100k

St. Clair County is 25% safer than the comparison

2023 road deaths from the NHTSA Fatality Analysis Reporting System over population from the U.S. Census Bureau Population Estimates Program (Vintage 2023). Rates shown for counties with 10,000+ residents and a 2023 FARS record.

Among the 15 rated counties in Illinois, St. Clair County ranks 15 for per-capita risk, below the state's own per-capita average of 19.0 per 100,000 -- nationally, this rate places it close to the national middle by that per-capita measure. The gap between St. Clair County's rate and the state average is 4.7 per 100,000. Its closest per-capita peer statewide is Ford County, at 30.2 per 100,000 (a difference of 15.9). Its peer counties, highest to lowest per 100,000 residents: Mason County (55.9), Pike County (55.8), Cumberland County (48.7), Montgomery County (47.0), Lawrence County (40.5), Saline County (39.3), Richland County (38.7), Iroquois County (38.3), Bond County (36.5), Union County (36.0), Ogle County (31.2), Jefferson County (30.3), Ford County (30.2), Stephenson County (30.2).

St. Clair County's rate vs. every rated U.S. county

Deaths per 100,000 residents -- counties with 10,000+ people, NHTSA FARS over Census population

14 Lower than most a lower per-capita rate than 57% of 2,328 rated counties

rated U.S. counties, bucketed by value

Each bar is a band; taller bars hold more rated counties. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.

Source NHTSA FARS over U.S. Census Bureau population estimates · 2026-08-09

St. Clair County's rate vs. the Illinois state average

← Back to Illinois All States

Source: NHTSA Fatality Analysis Reporting System (FARS) This information is for research and informational purposes only

Read our methodology - how this data is sourced, computed, and verified.

Counties with similar FARS profiles

Two cross-state peer sets for St. Clair County. Same-state rate comparisons stay in the chart above; these neighborhoods are nearest other-state counties with population at least 250,000.

Similar per-capita fatality rate

Nearest counties by deaths per 100,000 residents (14.3 here), outside Illinois.

Atlantic County 14.5 /100k · NJ St. Tammany County 14.5 /100k · LA Richland County 14.1 /100k · SC Lee County 14.6 /100k · FL

Similar fatality volume

Nearest counties by recorded FARS deaths (287 here), excluding the rate-peer set.

York County 286 deaths · SC St Johns County 289 deaths · FL Dane County 284 deaths · WI Larimer County 284 deaths · CO

Verify with NHTSA FARS →

Verify with FHWA →

Source and method. PlainRoadSafety is rendered directly from the National Highway Traffic Safety Administration Fatality Analysis Reporting System (FARS). PlainRoadSafety aggregates published FARS records and does not invent a fatality count the census does not report. County figures are computed directly from NHTSA FARS census data, no figure is typed in by an editor. See our Editorial & Corrections Policy, the methodology behind these numbers, or Report a correction. Data current as of October 2024.