ZIP code profile · 2024 county data

ZIP Code 70342

St. Mary County, Louisiana: Census demographics for this ZIP plus the containing county's FBI UCR crime rate.

Data updated 2026-08-24

876
Property rate /100K (county)
4,786
Population (ZIP)
180
Violent rate /100K (county)

Is ZIP code 70342 safe? Honest data snapshot

ZIP code 70342 sits within St. Mary County, LA, a county whose reported crime runs below the national average (see the county-level FBI figures below, not a ZIP-specific calculation).

St. Mary County's reported crime sits somewhat below the national average: 180 violent and 876 property incidents per 100,000 residents in 2024.

ZIP 70342 carries a Census-reported population of 4,786, ranking #3 of 7 ZIPs in St. Mary County, spread across 7.46 square miles (about 642 people per square mile). For a full breakdown of St. Mary County's crime categories and year-over-year trend, see the St. Mary County crime page linked below.

ZIP 70342 has no FBI-native crime rate (postal codes are not police jurisdictions). The property-led county proxy above is from St. Mary County agency submissions; see methodology for the ZCTA plurality map. Methodology.

ZIP 70342 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
$52,083
Median age
34.6 years
Owner-occupied homes
77%
Occupied homes
1,754

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 70342?

Within the participating-agency records for St. Mary County, reported violent and property crime rates both sit below their U.S. benchmarks: violent crime is 49% below and property crime is 49% 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 70342. 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.

ZIP 70342 sits near the middle of St. Mary County's ZIP population ordering (#3 of 7). The county comparison is useful regional context, but it cannot say how reported incidents are distributed within this postal area.

St. Mary County UCR book ZIP 70342 inherits

ZIP 70342 itself is about 642 people per Census sq mi across 7.5 sq mi (4,786 residents), a postal settlement fact independent of the county UCR proxy.

ZIP 70342 accounts for roughly 9.7% of the county reporting population (4,786 of 49,406).

St. Mary County leans on larceny-theft at 56% of reported offenses (mix index 3,805). ZIP 70342 has no separate FBI offense book.

St. Mary County 2024 vs 2023: violent counts +41% vs 2023; property counts +4% vs 2023. Year-over-year moves are county agency submissions, still not ZIP-native.

St. Mary 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 70342

Similar county violent rate (~180/100K)

Similar Census population (~4,786)

County detail: St. Mary County · State atlas: Louisiana

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.