ZIP code profile · 2024 county data

ZIP Code 83318

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

Data updated 2026-08-24

661
Property rate /100K (county)
19,324
Population (ZIP)
170
Violent rate /100K (county)

Is ZIP code 83318 safe? Honest data snapshot

ZIP code 83318 sits within Cassia County, ID, a county whose reported crime runs below the national average (see the county-level FBI figures below, not a ZIP-specific calculation).

Reported crime here runs well below the national average: 170 violent incidents and 661 property incidents per 100,000 residents in 2024, per county-level agency submissions.

ZIP 83318 is the largest ZIP in Cassia County by population, 19,324 residents (#1 of 7 county ZIPs), across 254.17 square miles (76/sq mi). For a full breakdown of Cassia County's crime categories and year-over-year trend, see the Cassia County crime page linked below.

ZIP 83318 has no FBI-native crime rate (postal codes are not police jurisdictions). The property-led county proxy above is from Cassia County agency submissions; see methodology for the ZCTA plurality map. Methodology.

ZIP 83318 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
$63,511
Median age
31.9 years
Owner-occupied homes
67%
Occupied homes
6,378

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

How useful is the county proxy for ZIP 83318?

Within the participating-agency records for Cassia County, reported violent and property crime rates both sit below their U.S. benchmarks: violent crime is 52% below and property crime is 61% below. The two submitted measures point in the same direction, but they do not establish complete county coverage or turn the result into a ZIP-level rating for 83318. Both comparisons use the same 2024 county reporting population and FBI-submitted counts, so the two directions are internally comparable for this release, not evidence about a different year.

Within the county, 83318 is one of the most populous ZIPs (#1 of 7). Its 19,324 residents therefore represent a comparatively large share of the local population, but the county total still combines reports from places outside this ZIP.

Cassia County UCR book ZIP 83318 inherits

ZIP 83318 itself is about 76 people per Census sq mi across 254.2 sq mi (19,324 residents), a postal settlement fact independent of the county UCR proxy.

ZIP 83318's 19,324 residents are about 78.4% of the 2024 county reporting population (24,655), a large postal share of a county-wide rate.

Cassia County's 2024 UCR book concentrates in larceny-theft (71% of 205 offenses; mix index 5,455). ZIP 83318 inherits that county mix, not a postal-native split.

Cassia County 2024 vs 2023: violent counts +75% vs 2023; property counts -30% vs 2023. Year-over-year moves are county agency submissions, still not ZIP-native.

Cassia 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 83318

Similar county violent rate (~170/100K)

Similar Census population (~19,324)

County detail: Cassia County · State atlas: Idaho

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.