ZIP code profile · 2024 county data

ZIP Code 51040

Monona County, Iowa: Census demographics for this ZIP plus the containing county's FBI UCR crime rate.

Data updated 2026-08-24

389
Property rate /100K (county)
3,422
Population (ZIP)
137
Violent rate /100K (county)

Is ZIP code 51040 safe? Honest data snapshot

ZIP code 51040 sits within Monona County, IA. The figures below are the county's own FBI UCR numbers for 2024, the most accurate available statistic for this location, not a ZIP-specific calculation.

Monona County reported a violent-crime rate of 137 per 100,000 residents and a property-crime rate of 389 per 100,000 in 2024, drawing on county-level agency submissions.

Based on just 12 reported violent incidents across a county population of 8,751, this count is too low to support a reliable per-100K rate comparison. It may reflect a genuinely low-crime county, or it may reflect incomplete agency-level reporting to the FBI UCR Program for this county and year, small county-level counts are common in FBI Table 10 and should be treated as a data point, not a precise safety ranking.

ZIP 51040 is the largest ZIP in Monona County by population, 3,422 residents (#1 of 9 county ZIPs), across 129.51 square miles (26/sq mi). For a full breakdown of Monona County's crime categories and year-over-year trend, see the Monona County crime page linked below.

ZIP 51040 has no FBI-native crime rate (postal codes are not police jurisdictions). The property-led county proxy above is from Monona County agency submissions; see methodology for the ZCTA plurality map. Methodology.

ZIP 51040 Census context

These are ZIP/ZCTA demographic estimates, separate from the county-level FBI proxy above. They describe the local settlement, not a crime rate.

Median household income
$55,559
Median age
38.0 years
Owner-occupied homes
78%
Occupied homes
1,485

Source: U.S. Census Bureau, ACS 2022 5-year ZCTA estimates (income, age, and occupied housing tenure).

Monona County UCR book ZIP 51040 inherits

ZIP 51040 itself is about 26 people per Census sq mi across 129.5 sq mi (3,422 residents), a postal settlement fact independent of the county UCR proxy.

ZIP 51040's 3,422 residents are about 39.1% of the 2024 county reporting population (8,751), a large postal share of a county-wide rate.

Monona County leans on larceny-theft at 43% of reported offenses (mix index 2,873). ZIP 51040 has no separate FBI offense book.

Monona County 2024 vs 2023: property counts -21% vs 2023. Year-over-year moves are county agency submissions, still not ZIP-native.

Monona County offense mix (2024)

Mix index is HHI × 10,000 on county offense-type shares. Distinct from the per-100K rates in the hero; still county-agency data, not a ZIP-native FBI table.

Nationwide peers for ZIP 51040

Similar Census population (~3,422)

County detail: Monona County · State atlas: Iowa

Sources: U.S. Census Bureau (ZIP population, land area, 2020 ZCTA-to-county relationship file, ACS 5-year estimates) and FBI Uniform Crime Reporting (UCR) Program, Crime in the United States (CIUS) Table 10 (county-level crime, attributed via ZIP-to-county crosswalk).

Verify with Census.gov Geography and FBI.gov UCR.

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 combines Census ZIP-level figures with a ZIP-to-county crosswalk to attribute FBI UCR crime data honestly, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.