County crime profile · 2024 · very large county · property-led
At 257,400 residents, St. Clair County is a very large county in Illinois. FBI UCR county totals below are read before any per-100,000 rate (Census denominator when matched).
Data updated 2026-08-24
St. Clair County, IL reported 38 violent crimes per 100,000 in FBI UCR 2024
According to the FBI Uniform Crime Reporting (UCR) Program for 2024, St. Clair County, IL agencies reported 97 violent and 270 property offenses. That equals about 38 violent and 105 property crimes per 100,000 using a verified Census population join. Table 10 coverage is a voluntary subset of U.S. counties.
Offense mix
Violent offenses are 26.4% of the 367 Part I offenses reported in St. Clair County for 2024, against a median of 20.1% across comparable Illinois counties — a gap of 6.3 points. Offense mix is shaped by which agencies report and how incidents are classified as well as by the underlying offenses, so it describes the reported record rather than a settled difference in conditions.
2021–2024 direction
Across 4 comparable reporting years, the rate moved from 34.6 per 100,000 in 2021 to 37.7 in 2024 (+9.0%). The highest observed value was 48.6 in 2023 and the lowest 34.6 in 2021. Years whose submission failed the completeness test are left out of this comparison rather than plotted as change.
Position in the state cohort
At 37.7 reported violent offenses per 100,000 residents in 2024, St. Clair County ranks 38 of 77 — above 39 of the 76 other Illinois counties whose 2024 submission passes this site’s completeness test and carries a matched Census denominator. That is +1.1% against the cohort median of 37.3. Counties that did not report, or that reported implausibly low totals, are excluded from this cohort rather than counted as low-crime.
On a very large county row, county figures aggregate every participating agency inside the county. Participation is voluntary. Per-100,000 rates use a separately matched 2020 U.S. Census county population, never a Table 10 field; unmatched counties stay count-only. A large county line encloses very different communities.
| Category | Count |
|---|---|
| Property Crime | 270 |
| Burglary | 62 |
| Larceny-Theft | 150 |
| Motor Vehicle Theft | 58 |
| Arson | 0 |
| Violent Crime | 97 |
| Murder | 0 |
| Rape | 8 |
| Robbery | 2 |
| Aggravated Assault | 87 |
A per-capita rate is easiest to read against places of similar scale, so these are the Illinois counties closest to St. Clair County in population. Their populations run from 196,343 to 310,229, against 257,400 here. Or launch the side-by-side compare tool to benchmark two jurisdictions directly.
State atlas: Illinois · Compare · Rankings
Source: FBI Uniform Crime Reporting (UCR) Program, Crime in the United States (CIUS) Table 10.
FBI Table 10 supplies county offense counts but no resident population. Where this page shows a per-100,000 rate, the denominator is a separately matched 2020 U.S. Census Bureau county population; unmatched county rows remain count-only. Statewide comparisons draw on the state UCR program. Verify with FBI.gov UCR and Census.gov QuickFacts.
Read our methodology , how this data is sourced, computed, and verified.
Every figure on PlainCrime is rendered directly from FBI Uniform Crime Reporting (UCR) source data, no number is typed in by an editor. This page draws directly on FBI Uniform Crime Reporting source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.