Skip to content

Checked

Union Mill, VA

Census-designated place in Fairfax County, Virginia. ZIP codes: 20124.

Population

4,484

Land area

10sq mi

People per sq mi

449

ZIP codes

1

Union Mill and its ZIP codes

Full map

Union Mill at a glance

  • Union Mill is about 2 times as dense as Virginia as a whole.
  • The median household income is more than $250,000, the highest bracket the Census Bureau reports.
  • A typical owner-occupied home is valued at $961,400 (about 2.5 times the Virginia figure) and median rent is $2,365 a month.

Local data for Union Mill, VA

Counts from official public data

Housing and community stats

Union Mill, VA, American Community Survey 2020-2024

Full profile

Median household income

$250,000+

Poverty rate

4.4%

Median home value

$961,400

Median rent

$2,365/mo

Homeownership

94.8%

Bachelor's or higher

71.1%

Median age

47.3

Average commute

36.6 min

Largest reported origins and ancestries: Pakistani Americans (385), German Americans (381), Irish Americans (372).

Home values and rentsIncome, education and commute

Economy and federal money

Jobs, pay, income and spending are for Fairfax County. PPP loans are for Union Mill.

Details

Unemployment rate

3.4%

Sep 2026, +0.1 pts in a year

Average annual pay

$115,004

634,638 jobs, 2025

Federal spending

$45.6B

FY 2026, $39,671 per person

Fairfax County economyFederal spending

How people get to work

Union Mill, VA, workers 16 and older. American Community Survey 5-year estimates

  • Drove alone64.0%
  • Carpooled4.4%
  • Public transit2.1%
  • Walked0.8%
  • Bicycle0.0%
  • Taxi, ride-hailing, motorcycle or other0.5%
  • Worked from home28.2%

Average one-way commute: 36.6 minutes for people who do not work from home.

Environment and hazard risk

Union Mill, VA, from FEMA, NOAA and EPA

Full report

Natural hazard risk

Relatively High

Top: winter weather

Storm events since 1996

1,831

Countywide, mostly thunderstorm wind

Flood insurance policies

3,582

1.1% of homes, county

July high / Jan low

88° / 24°F

Hazards, floods and storm historyCheck a flood zone

Health statistics

Share of adults in Union Mill, VA, CDC PLACES estimates

All 40 measures

Obesity

22.2%

U.S. 33.3% -11.1 pts

Diabetes

10.5%

U.S. 12.1% -1.6 pts

Smoking

7.0%

U.S. 12.8% -5.8 pts

Uninsured (18-64)

4.4%

U.S. 11.1% -6.7 pts

ZIP codes in Union Mill

1 in or overlapping Union Mill. Population shown

·

Cities near Union Mill

NameDistanceLand area (sq mi)
CliftonTown1.3 mi0.2
Fairfax StationCensus-designated place2.4 mi9.1
BraddockCensus-designated place2.8 mi6.4
YorkshireCensus-designated place3.1 mi2.4
Manassas ParkCity3.4 mi3
CentrevilleCensus-designated place3.6 mi11.9
Fair LakesCensus-designated place3.8 mi2.4
George MasonCensus-designated place4.2 mi2.5
Burke CentreCensus-designated place4.8 mi3.1
Fair OaksCensus-designated place5 mi5
GreenbriarCensus-designated place5 mi1.6
Loch LomondCensus-designated place5.1 mi0.7
Kings Park WestCensus-designated place5.1 mi3
BuckhallCensus-designated place5.1 mi19.7
SudleyCensus-designated place5.9 mi2.8
FairfaxCity6 mi6.2

Frequently asked questions

What county is Union Mill, VA in?
Union Mill is in Fairfax County, Virginia.
What ZIP codes are in Union Mill, VA?
ZIP codes in or overlapping Union Mill include 20124.
What is the population of Union Mill, VA?
About 4,484 people live in Union Mill, based on American Community Survey 5-year estimates.
What cities are near Union Mill?
Nearby places include Clifton (1.3 mi), Fairfax Station (2.4 mi), Braddock (2.8 mi), Yorkshire (3.1 mi), Manassas Park (3.4 mi).

Source: U.S. Census Bureau (TIGER/Line boundaries, American Community Survey) · Data as of 12/31/2023