ZIP code profile · 2024 county data

ZIP Code 20171

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

Data updated 2026-08-24

1,425
Property rate /100K (county)
51,081
Population (ZIP)
94
Violent rate /100K (county)

Is ZIP code 20171 safe? Honest data snapshot

ZIP code 20171 sits within Fairfax 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: 94 violent incidents and 1,425 property incidents per 100,000 residents in 2024, per county-level agency submissions.

ZIP 20171 is the largest ZIP in Fairfax County by population, 51,081 residents (#3 of 43 county ZIPs), across 11.62 square miles (4,396/sq mi). For a full breakdown of Fairfax County's crime categories and year-over-year trend, see the Fairfax County crime page linked below.

ZIP 20171 has no FBI-native crime rate (postal codes are not police jurisdictions). The property-led county proxy above is from Fairfax County agency submissions; see methodology for the ZCTA plurality map. Methodology.

ZIP 20171 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
$155,357
Median age
36.1 years
Owner-occupied homes
57%
Occupied homes
18,268

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 20171?

Within the participating-agency records for Fairfax County, reported violent and property crime rates both sit below their U.S. benchmarks: violent crime is 73% below and property crime is 17% 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 20171. 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, 20171 is one of the most populous ZIPs (#3 of 43). Its 51,081 residents therefore represent a comparatively large share of the local population, but the county total still combines reports from places outside this ZIP.

Fairfax County UCR book ZIP 20171 inherits

ZIP 20171 itself is about 4,396 people per Census sq mi across 11.6 sq mi (51,081 residents), a postal settlement fact independent of the county UCR proxy.

ZIP 20171 accounts for roughly 4.4% of the county reporting population (51,081 of 1,150,309).

Fairfax County's 2024 UCR book concentrates in larceny-theft (84% of 17,465 offenses; mix index 7,135). ZIP 20171 inherits that county mix, not a postal-native split.

Fairfax 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 20171

Similar county violent rate (~94/100K)

Similar Census population (~51,081)

County detail: Fairfax 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.