🇺🇸 United States ZIP Code

STANDARD

22031

Fairfax

ZIP Code 22031 is a standard zip code serving Fairfax, Fairfax, Virginia (VA), in Fairfax (city) County, United States. It has an estimated population of 29,795 with a median household income of $106,728. The area falls within the America/New_York timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: Virginia (VA)
County: Fairfax (city)
City: Fairfax
Timezone: America/New_York

Coordinates

Latitude: 38.860400
Longitude: -77.264900

Geographic Details

Land Area: 6.81 mi²
Water Area: 0.05 mi²
Population Density: 4378.0 people per mi² (90th percentile)
Bounding Box: 38.883549°N, 38.837774°S, -77.226167°E, -77.297850°W

With 29,795 residents spread across 6.81 square miles, this area has a population density of 4378.0 people per square mile.

Demographics

29,795

Population

85th percentile

$106,728

Median Income

95th percentile

$491,800

Median Home Value

95th percentile

6.81 mi²

Land Area

The median household income in 22031 is $106,728, and the median home value is $491,800. This places the area in the top 25% nationally for household income.

Housing

12,048

Total Units

11,519

Occupied Units

95.6%

Occupancy Rate

Nearby ZIP Codes

Other zip codes in Fairfax, VA.

22030

Fairfax

22032

Fairfax

22033

Fairfax

22034

Fairfax

22035

Fairfax

22036

Fairfax

22037

Fairfax

22038

Fairfax

Similar ZIP Codes in Virginia

ZIP codes with similar median household income in Virginia.

20191

Reston

$108,013

22209

Arlington

$93,906

22043

Falls Church

$103,972

22553

Spotsylvania

$92,521

22206

Arlington

$98,985

20175

Leesburg

$112,815

22192

Woodbridge

$98,169

22936

Earlysville

$104,850

Frequently Asked Questions

What information is available for each ZIP code?

Each ZIP code page shows city, state, county, geographic coordinates, timezone, population, median household income, median home value, housing units, land area, population density, commute time, educational attainment, area codes, and ZIP code type (Standard, PO Box, or Unique).

What are the different types of ZIP codes?

There are three types of ZIP codes: Standard (residential and commercial delivery areas), PO Box (assigned to post office box sections), and Unique (assigned to a single high-volume address like a government agency or large company). Standard ZIP codes are the most common.

How often is ZIP code data updated?

ZIP code assignments are updated quarterly by the USPS. Demographic data comes from the US Census Bureau's American Community Survey (ACS), which releases new 5-year estimates annually. ZipFYI updates its data to reflect the latest available information.

What is population density and why does it matter?

Population density measures the number of people per square mile in a ZIP code area. It helps identify urban vs. rural areas, affects real estate values, impacts service availability, and is used in market analysis. Dense urban ZIP codes may have 50,000+ people per square mile.

How are ZIP code boundaries determined?

ZIP code boundaries are determined by the USPS based on mail delivery routes, not political or geographic boundaries. They follow carrier routes and may cross city, county, or even state lines. Boundaries can change when the USPS reorganizes delivery operations.

What does median household income tell me about a ZIP code?

Median household income is the middle value when all household incomes in a ZIP code are sorted. Half of households earn more and half earn less. It is a better indicator of typical earnings than average income, which can be skewed by very high or very low outliers.