County crime profile · 2024 · large county · property-led
At 152,854 residents, Johnson County is a large county in Iowa. FBI UCR county totals below are read before any per-100,000 rate (Census denominator when matched).
Data updated 2026-09-05
Johnson County, IA reported 34 violent crimes per 100,000 in FBI UCR 2024
According to the FBI Uniform Crime Reporting (UCR) Program for 2024, Johnson County, IA agencies reported 52 violent and 121 property offenses. That equals about 34 violent and 79 property crimes per 100,000 using a verified Census population join. Table 10 coverage is a voluntary subset of U.S. counties.
2021–2024 direction
Across 4 comparable reporting years, the rate moved from 48.4 per 100,000 in 2021 to 34.0 in 2024 (-29.7%). The highest observed value was 48.4 in 2021 and the lowest 15.7 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 34.0 reported violent offenses per 100,000 residents in 2024, Johnson County ranks 59 of 86 — above 27 of the 85 other Iowa counties whose 2024 submission passes this site’s completeness test and carries a matched Census denominator. That is -26.6% 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.
Offense mix
Violent offenses are 30.1% of the 173 Part I offenses reported in Johnson County for 2024, against a median of 24.0% across comparable Iowa counties — a gap of 6.1 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.
On a 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 | 121 |
| Burglary | 38 |
| Larceny-Theft | 72 |
| Motor Vehicle Theft | 11 |
| Arson | 3 |
| Violent Crime | 52 |
| Murder | 0 |
| Rape | 7 |
| Robbery | 0 |
| Aggravated Assault | 45 |
Johnson County's crime figures on this page originate from Johnson 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 Johnson County in population. Their populations run from 99,266 to 174,669, against 152,854 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 Johnson 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.