County crime profile · 2024 · mid-size county · property-led
O'Brien County (14,182 people) sits in the mid-size county band in Iowa. This page opens with reported offense counts, then rates where a Census join exists.
Data updated 2026-09-05
O'Brien County, IA reported 85 violent crimes per 100,000 in FBI UCR 2024
According to the FBI Uniform Crime Reporting (UCR) Program for 2024, O'Brien County, IA agencies reported 12 violent and 37 property offenses. That equals about 85 violent and 261 property crimes per 100,000 using a verified Census population join. Table 10 coverage is a voluntary subset of U.S. counties.
Small-count caution
O'Brien County reported 12 violent offences in 2024 against a population of 14,182. At this volume one additional or one fewer report moves the per-100,000 rate noticeably, so the figure is better read as a data point than as a precise measurement, and year-to-year swings here are expected.
2020–2024 direction
Across 5 comparable reporting years, the rate moved from 232.7 per 100,000 in 2020 to 84.6 in 2024 (-63.6%). The highest observed value was 232.7 in 2020 and the lowest 63.5 in 2023. Years whose submission failed the completeness test are left out of this comparison rather than plotted as change.
Position in the state cohort
At 84.6 reported violent offenses per 100,000 residents in 2024, O'Brien County ranks 18 of 86 — above 68 of the 85 other Iowa counties whose 2024 submission passes this site’s completeness test and carries a matched Census denominator. That is +82.9% against the cohort median of 46.3. Counties that did not report, or that reported implausibly low totals, are excluded from this cohort rather than counted as low-crime.
Property-offense composition
Larceny-theft is 70.3% of reported property offenses in O'Brien County, against a cohort median of 56.6%. The remainder is burglary (6) and motor vehicle theft (5). Composition differences of this size usually track what kinds of places and property are present in a jurisdiction.
Mid-size county rows still aggregate voluntary UCR submissions. Per-100,000 rates need a matched 2020 Census population; unmatched stay count-only. County-wide totals rarely describe any single town inside the line.
| Category | Count |
|---|---|
| Property Crime | 37 |
| Burglary | 6 |
| Larceny-Theft | 26 |
| Motor Vehicle Theft | 5 |
| Arson | 0 |
| Violent Crime | 12 |
| Murder | 0 |
| Rape | 1 |
| Robbery | 0 |
| Aggravated Assault | 11 |
O'Brien County's crime figures on this page originate from O'Brien County Sheriff's Office's submission to the FBI's Uniform Crime Reporting Program.
This agency reports via NIBRS, the incident-based system that captures more detail per offense (multiple crimes per incident, victim/offender data) than the older summary counts.
A per-capita rate is easiest to read against places of similar scale, so these are the Iowa counties closest to O'Brien County in population. Their populations run from 14,061 to 15,039, against 14,182 here. Or launch the side-by-side compare tool to benchmark two jurisdictions directly.
State atlas: Iowa · 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.
Put this to use
Use the O'Brien County, IA FBI UCR county record to open cities inside the county, compare the state file, or look up another place.
County Table 10 totals are voluntary agency filings: incomplete coverage is not a county crime measure, and a countywide figure is not a neighbourhood verdict.
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.