ZIP code profile · 2024 county data

ZIP Code 20166

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

Data updated 2026-08-24

553
Property rate /100K (county)
13,479
Population (ZIP)
71
Violent rate /100K (county)

Is ZIP code 20166 safe? Honest data snapshot

ZIP code 20166 sits within Loudoun County, VA, 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: 71 violent incidents and 553 property incidents per 100,000 residents in 2024, per county-level agency submissions.

ZIP 20166 carries a Census-reported population of 13,479, ranking #10 of 17 ZIPs in Loudoun County, spread across 27.19 square miles (about 496 people per square mile). For a full breakdown of Loudoun County's crime categories and year-over-year trend, see the Loudoun County crime page linked below.

ZIP 20166 has no FBI-native crime rate (postal codes are not police jurisdictions). The property-led county proxy above is from Loudoun County agency submissions; see methodology for the ZCTA plurality map. Methodology.

ZIP 20166 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
$133,085
Median age
33.9 years
Owner-occupied homes
51%
Occupied homes
4,946

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 20166?

Within the participating-agency records for Loudoun County, reported violent and property crime rates both sit below their U.S. benchmarks: violent crime is 80% below and property crime is 68% 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 20166. 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 20166 sits near the middle of Loudoun County's ZIP population ordering (#10 of 17). The county comparison is useful regional context, but it cannot say how reported incidents are distributed within this postal area.

Loudoun County UCR book ZIP 20166 inherits

ZIP 20166 itself is about 496 people per Census sq mi across 27.2 sq mi (13,479 residents), a postal settlement fact independent of the county UCR proxy.

ZIP 20166 accounts for roughly 3.2% of the county reporting population (13,479 of 420,959).

Loudoun County's 2024 UCR book concentrates in larceny-theft (78% of 2,624 offenses; mix index 6,168). ZIP 20166 inherits that county mix, not a postal-native split.

Loudoun County 2024 vs 2023: violent counts +1% vs 2023; property counts -8% vs 2023. Year-over-year moves are county agency submissions, still not ZIP-native.

Loudoun 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 20166

Similar county violent rate (~71/100K)

Similar Census population (~13,479)

County detail: Loudoun County · State atlas: Virginia

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.