Union Mill
Census-designated place in Fairfax County, Virginia

Union Mill is an unincorporated community (census-designated place) in Fairfax County, Virginia, with 4,997 residents (2020 Census). It sits at 302 ft (92 m) above sea level. The nearest town is Clifton, 1.5 miles S.
- 4,997residents (2020 Census)
- 302 ftelevation · 92 m
- 10.0 sq miland area · 25.9 km²
- 500 / sq mipopulation density
- 20124ZIP code
About Union Mill
Union Mill is a census designated place in Fairfax County, Virginia, United States.
As of the 2020 census, Union Mill had a population of 4,997.
Text: Wikipedia · CC BY-SA 4.0
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Living in Union Mill
- Median household income
- $250,001
- Median home value
- $961,400
- Median rent
- $2,365/mo
- Median age
- 47.3
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Map of Union Mill
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Open in Google Maps ›Union Mill, VA population
Union Mill had 4,997 residents in the 2020 Census.
| 2020 Census | 4,997 |
|---|---|
| Density | 500 per sq mi (193 per km²) |
Source: U.S. Census Bureau, Decennial Census.
Union Mill at a glance
| State | Virginia (VA) |
|---|---|
| County | Fairfax County |
| Type | Census-designated place |
| Population | 4,997 (2020) |
| Land area | 9.98 sq mi (25.9 km²) |
| Water area | 0.10 sq mi (0.25 km²) |
| Elevation | 302 ft (92 m) |
| Coordinates | 38.8013° N, 77.3871° W |
| ZIP code | 20124 |
| Census code (GEOID) | 5180029 |
Sources: U.S. Census Bureau (Gazetteer, ZCTA), USGS GNIS, Wikidata.
Towns near Union Mill
- Clifton1.5 mi S
- Fairfax Station2.7 mi E
- Braddock2.7 mi NE
- Yorkshire3.5 mi W
- Fair Lakes3.6 mi N
- Manassas Park3.6 mi SW
- Centreville3.9 mi NW
- Fair Oaks4.7 mi N
- Burke Centre4.7 mi E
- Greenbriar4.9 mi N
- Kings Park West5.0 mi E
- George Mason5.0 mi NE
Straight-line distance between town centers.
Frequently asked questions about Union Mill
What county is Union Mill in?
Union Mill is in Fairfax County, Virginia.
What is the population of Union Mill, VA?
4,997 people lived in Union Mill at the 2020 Census.
What is the ZIP code of Union Mill, VA?
The ZIP code of Union Mill is 20124.
What is the elevation of Union Mill?
302 feet (92 m) above sea level.
What towns are near Union Mill?
Clifton (1.5 mi), Fairfax Station (2.7 mi), Braddock (2.7 mi), Yorkshire (3.5 mi), Fair Lakes (3.6 mi).
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