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Advertise here →Union Mill, VA · Houses & Market Data
Union Mill, Virginia houses and real estate market data.
Houses in Union Mill, VA (Fairfax County) — Census median home value $942,400, county listing prices down about 7.9% over the past year. Market data for Union Mill houses and the broader area.
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Union Mill, VA is in Fairfax County, Virginia — this guide covers houses in Union Mill and the whole local market: resale homes, condos, land, and new construction. The most recent Census estimate puts the population at 4,351, with a median household income of $245,265. Census data puts Union Mill houses at a median value of $942,400 (all owner-occupied homes); Fairfax County's current median listing price runs $789,450, down about 7.9% over the past year.
Info from government sites and builders may have provided source info.
Market overview
Union Mill housing market
Union Mill is in Fairfax County, Virginia. Manifest Census and county price-trend data provide baseline context for houses in Union Mill and the surrounding county market.
Median home value (Census ACS)
$942,400
Population (Census ACS)
4,351
Median household income
$245,265
County price trend (2025)
2.1% YoY
Population, income, and median home value from the project batch manifest (Census ACS 2023 5-year). County price trend from FHFA county HPI when present in the manifest row.
At a glance
Union Mill market snapshot
Population
4,351
County
Fairfax County
Median Household Income
$245,265
Median Home Value (city)
$942,400
Median Listing Price (Fairfax County)
$789,450
Median Gross Rent
$2,581/mo
Price Trend (YoY)
-7.9%
Market data compiled from public sources; deemed reliable but not guaranteed; verify independently. See About
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What makes Union Mill different
Home Value, By Source
The Census Bureau's American Community Survey (2023 5-year estimate) puts Union Mill's median home value — across all owner-occupied homes, not just recent sales — at $942,400. Separately, Fairfax County's current median listing price (via Realtor.com data, 2026-06-01) runs $789,450. These cover different geography (city vs. county) and different measures (assessed value vs. active listings), which is why we show both rather than picking one — full source list on our data sources page.
County Price Trend
Fairfax County's FHFA house price index shows a 2.1% annual change in 2025.
Population & Income
Union Mill has an estimated population of 4,351 and a median household income of $245,265, per the Census Bureau's American Community Survey (2023 5-year estimate).
Affordability Snapshot
Union Mill's Census-reported median home value works out to about 3.8x the area's median household income, and median gross rent runs roughly 13% of that same income on an annualized basis. Housing economists commonly flag a price-to-income ratio above 4x as historically elevated -- useful context, not a personal affordability verdict.
Nearby
Places around Union Mill
County guide: Fairfax County — cities, market context, and local resources for the county that includes Union Mill.
USAHouses.com also helps visitors looking in nearby Fairfax County and other Virginia communities. Some locations may not yet have dedicated pages, but many licensed professionals in this region assist surrounding communities.
Nearby communities include Clifton, Fairfax Station, Braddock, Fair Lakes, Centreville, Fair Oaks, Burke Centre, Greenbriar, Kings Park West, George Mason, Navy, Bull Run, Long Branch, Chantilly, Burke, South Run.
Clifton market data
Nearby city · ~1.5 mi
Fairfax Station market data
Nearby city · ~2.7 mi
Braddock market data
Nearby city · ~2.7 mi
Fair Lakes market data
Nearby city · ~3.6 mi
Centreville market data
Nearby city · ~3.9 mi
Fair Oaks market data
Nearby city · ~4.7 mi
Burke Centre market data
Nearby city · ~4.7 mi
Greenbriar market data
Nearby city · ~4.9 mi
Kings Park West market data
Nearby city · ~5.0 mi
George Mason market data
Nearby city · ~5.0 mi
Navy market data
Nearby city · ~6.1 mi
Bull Run market data
Nearby city · ~6.1 mi
Long Branch market data
Nearby city · ~6.6 mi
Chantilly market data
Nearby city · ~6.8 mi
Burke market data
Nearby city · ~6.9 mi
South Run market data
Nearby city · ~7.2 mi
More Virginia cities with market guides: Virginia Beach, Chesapeake, Arlington, Norfolk, Newport News, Alexandria, Hampton, Roanoke.
Virginia Beach market data
Same-state city guide
Chesapeake market data
Same-state city guide
Arlington market data
Same-state city guide
Norfolk market data
Same-state city guide
Newport News market data
Same-state city guide
Alexandria market data
Same-state city guide
Hampton market data
Same-state city guide
Roanoke market data
Same-state city guide
Adjacent-county Census places with USAHouses.com pages: Fairfax (~5.9 mi), Falls Church (~12.8 mi), Arlington (~16.3 mi), Alexandria (~16.4 mi).
New construction: New homes near Union Mill (Virginia Beach) · Virginia new construction.
Census & home facts
Union Mill data from published sources
Population (ACS 2023)
4,351
Median home value (ACS 2023)
$942,400
Median household income (ACS 2023)
$245,265
Median gross rent (ACS 2023)
$2,581
County FHFA annual change (2025)
2.1%
County median listing price (FRED/Realtor.com) (2026-06-01)
$789,450
Census place type
CDP
County
Fairfax County
Land area (Census Gazetteer 2024)
9.98 sq mi
Census GEOID
5180029
Census ACS, FHFA, and FRED figures are labeled with the year present in existing CSVs. Subject to change / confirm locally.
NewUSAHouses.com communities
Closest verified new-home communities near Union Mill
Availability and pricing are controlled by the builder and may change; confirm with the builder.
Village at Manassas Park ↗
Stanley Martin Homes · Manassas Park, Virginia · ~3.7 mi
Ashberry ↗
Lennar · Manassas, Virginia · ~6.0 mi · from $459,990
Lomond Village ↗
Ryan Homes · Manassas, Virginia · ~6.7 mi · from $534,990
Parkridge West ↗
NVHomes · Manassas, Virginia · ~6.9 mi
Liberty Crossing 2o2 ↗
Beazer Homes · Manassas, Virginia · ~6.9 mi
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Common questions
Union Mill FAQ
What are houses worth in Union Mill, VA?
The Census Bureau's American Community Survey puts the median value of houses in Union Mill at $942,400. Fairfax County's current median listing price runs $789,450, down about 7.9% over the past year.
How much do houses cost in Union Mill, VA?
For owner-occupied houses in Union Mill, Census ACS data shows a median value of $942,400. Active listing prices in Fairfax County may differ — see the market snapshot above.
What types of houses are in Union Mill, VA?
Union Mill houses include resale single-family homes, condos, mobile homes, and small multi-unit buildings, plus new construction in surrounding Fairfax County communities where builders are active. The housing-stock section below uses Census ACS structure counts when available for this city.
What is the population of Union Mill, VA?
The U.S. Census Bureau's American Community Survey (2023 5-year estimate) puts Union Mill's population at approximately 4,351.
What's the median rent in Union Mill, VA?
The Census ACS estimates median gross rent in Union Mill at approximately $2,581 per month.
What is the median household income in Union Mill, VA?
Census ACS data puts the median household income in Union Mill at approximately $245,265.
Is the Union Mill housing market growing?
Fairfax County's FHFA house price index shows a 2.1% annual change in 2025.
Is Union Mill, VA affordable relative to income?
Census ACS data puts Union Mill's median home value at about 3.8 times the median household income, with median gross rent equal to roughly 13% of that income annually. This is a general benchmark, not a personal pre-qualification -- your own income, debt, and down payment determine what you can actually afford.
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