The Town FilesUnion Mill, Virginia
Community in Fairfax County · population 4,997 (2020 Census)
- Median home
- $961,400
- Household income
- $250,001
- Jan low / Jul high
- 23° / 84°
- Snow a year
- 19 in
- Tornadoes ≤10 mi since 1950
- 22
- Median age
- 47.3
Union Mill is a community of 4,997 people in Fairfax County, Virginia. The median home is worth $961,400, above the typical Virginia town ($298,050). It ranks better for families than 96% of Virginia towns, more upscale than 96% of Virginia towns, better for retirees than 91% of Virginia towns.
How Union Mill ranks
Percentile among Virginia towns with at least 500 people on The Town Files lifestyle rankings. 50 is typical for the state; 90 means better than 90% of Virginia towns.
Homes and cost of living
The median home in Union Mill is worth $961,400, above the typical Virginia town ($298,050). Homes cost about 3.8 times the median household income of $250,001, which is more affordable than 51% of Virginia towns. Median rent is $2,365 a month. 94.8% of households own their home.
| Housing | Union Mill | Typical Virginia town |
|---|---|---|
| Median home value | $961,400 | $298,050 |
| Median rent | $2,365 | $1,254 |
| Median household income | $250,001 | $78,595 |
| Home value ÷ income | 3.8× | 3.8× |
| Homeownership | 94.8% | 69.2% |
| Median year built | 1987 | 1980 |
| Seasonal / vacation homes | 0.0% | — |
Who lives in Union Mill
| People | Union Mill | Typical Virginia town |
|---|---|---|
| Median age | 47.3 | 39.8 |
| Age 65 and over | 23.5% | 17.3% |
| Under 18 | 22.8% | — |
| Bachelor's degree or higher | 71.1% | 31.2% |
| Below the poverty line | 4.4% | 8.8% |
| Veterans | 8.0% | — |
| Born outside the U.S. | 30.1% | — |
| Work from home | 28.2% | 12.8% |
| Average commute | 36.6 min | 26.3 min |
| Homes with broadband | 100.0% | 91.8% |
Weather in Union Mill
July highs average 83.8°F and January lows 23.4°F. About 43.6 inches of rain and melted snow fall a year, with 18.5 inches of snow (typical Virginia town: 13.4 in). Expect about 13 days a year at 90°F or hotter and 99 nights at or below freezing.
Tornadoes, storms and disasters
22 tornadoes have passed within 10 miles of Union Mill since 1950, compared with 11 for the typical Virginia town. 6 rated (E)F2 or stronger. The strongest, an F3, struck on April 1, 1973 about 3.1 miles from the town center. The most recent was on March 31, 2022.
Hail of 1 inch or larger has been reported within 10 miles 104 times; the largest was 2.50 inches on April 23, 1999.
Severe weather in Fairfax County since 1996
Fairfax County has been included in 19 federal disaster or emergency declarations since 1953, most often for flood, freezing, hurricane.
| Declared | Incident | Declaration |
|---|---|---|
| January 23, 2026 | Winter Storm | EM-3631: Severe Winter Storm |
| April 2, 2020 | Biological | DR-4512: Covid-19 Pandemic |
| March 13, 2020 | Biological | EM-3448: Covid-19 |
| September 11, 2018 | Hurricane | EM-3403: Hurricane Florence |
| March 7, 2016 | Snowstorm | DR-4262: Severe Winter Storm And Snowstorm |
Jobs and pay in Fairfax County
Fairfax County had 636,430 jobs in 2024, paying an average of $114,100 a year. Unemployment was 2.5% in 2023; in Union Mill itself the ACS puts it at 2.5%.
Towns near Union Mill
- Fairfax Station, VA2.7 mi · 12,420 people · home $897,000
- Braddock, VA2.7 mi · 6,549 people · home $941,600
- Yorkshire, VA3.5 mi · 10,992 people · home $451,000
- Fair Lakes, VA3.6 mi · 8,404 people · home $588,200
- Manassas Park, VA3.7 mi · 17,219 people · home $395,900
- Centreville, VA3.9 mi · 73,518 people · home $590,500
- Fair Oaks, VA4.7 mi · 34,052 people · home $608,200
- Burke Centre, VA4.7 mi · 17,518 people · home $641,700
Union Mill questions
Is Union Mill, Virginia a good place to retire?
On The Town Files lifestyle rankings, Union Mill scores better for retirees than 91% of Virginia towns and quieter than 49%. 23.5% of residents are 65 or older (median age 47.3).
How much does a house cost in Union Mill?
The median owner-occupied home in Union Mill is valued at $961,400 (Census ACS 2020–2024), against a median household income of $250,001, so homes cost about 3.8 times income. Median rent is $2,365 a month.
What is the weather like in Union Mill?
July highs average 83.8°F and January lows 23.4°F (NOAA 1991–2020 normals). It gets about 43.6 inches of precipitation a year and 18.5 inches of snow.
Does Union Mill get tornadoes?
22 tornadoes have passed within 10 miles of Union Mill since 1950 (NOAA Storm Events); the strongest was a F3 on April 1, 1973. The typical Virginia town has had 11.
- U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024)
- U.S. Census Bureau, 2020 Census and 2025 Gazetteer (2020 / 2025)
- NOAA NCEI U.S. Climate Normals (1991–2020)
- NOAA NCEI Storm Events Database (1950–2026)
- FEMA OpenFEMA Disaster Declarations (this product uses the FEMA OpenFEMA API but is not endorsed by FEMA) (1953–2026)
- NCES Common Core of Data (2023–24)
- BLS Quarterly Census of Employment and Wages; USDA ERS county unemployment (BLS LAUS) (2000–2024)
- The Town Files lifestyle rankings, built from federal demographic, school, crime and housing data (2025)