ZIP code profile · 2024 county data

ZIP Code 20650

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

Data updated 2026-08-24

1,043
Property rate /100K (county)
15,522
Population (ZIP)
226
Violent rate /100K (county)

Is ZIP code 20650 safe? Honest data snapshot

ZIP code 20650 sits within St. Mary's County, MD, a county whose reported crime runs below the national average (see the county-level FBI figures below, not a ZIP-specific calculation).

St. Mary's County's reported crime sits somewhat below the national average: 226 violent and 1,043 property incidents per 100,000 residents in 2024.

ZIP 20650 is the largest ZIP in St. Mary's County by population, 15,522 residents (#3 of 26 county ZIPs), across 61.42 square miles (253/sq mi). For a full breakdown of St. Mary's County's crime categories and year-over-year trend, see the St. Mary's County crime page linked below.

ZIP 20650 has no FBI-native crime rate (postal codes are not police jurisdictions). The property-led county proxy above is from St. Mary's County agency submissions; see methodology for the ZCTA plurality map. Methodology.

ZIP 20650 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
$137,854
Median age
37.6 years
Owner-occupied homes
76%
Occupied homes
5,373

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 20650?

Within the participating-agency records for St. Mary's County, reported violent and property crime rates both sit below their U.S. benchmarks: violent crime is 36% below and property crime is 39% 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 20650. 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, 20650 is one of the most populous ZIPs (#3 of 26). Its 15,522 residents therefore represent a comparatively large share of the local population, but the county total still combines reports from places outside this ZIP.

St. Mary's County UCR book ZIP 20650 inherits

ZIP 20650 itself is about 253 people per Census sq mi across 61.4 sq mi (15,522 residents), a postal settlement fact independent of the county UCR proxy.

ZIP 20650 accounts for roughly 13.6% of the county reporting population (15,522 of 113,777).

St. Mary's County's 2024 UCR book concentrates in larceny-theft (64% of 1,444 offenses; mix index 4,426). ZIP 20650 inherits that county mix, not a postal-native split.

St. Mary's County 2024 vs 2023: violent counts +49% vs 2023; property counts +17% vs 2023. Year-over-year moves are county agency submissions, still not ZIP-native.

St. Mary's 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 20650

Similar county violent rate (~226/100K)

Similar Census population (~15,522)

County detail: St. Mary's County · State atlas: Maryland

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.