Union Mill

County:: Fairfax County
County Seat:: No
Area (mi²):: 9.985
State:: Virginia

Union Mill is a CDP located in Fairfax County, Virginia. Union Mill has a 2025 population of 5,378. Union Mill is currently growing at a rate of 7.15% annually and its population has increased by 23.29% since the most recent census, which recorded a population of 4,362 in 2020.

The average household income in Union Mill is $302,844 with a poverty rate of 4.14%.The median age in Union Mill is 45.2 years: 45.9 years for males, and 45 years for females.

Demographics

The racial composition of Union Mill includes 47.83% White, 40.45% Asian, and smaller percentages for other race, Black or African American and multiracial populations.

Population by Race

Race	Population	Percentage (of total)
White	2,081	47.83%
Asian	1,760	40.45%
Two or more races	376	8.64%
Other race	95	2.18%
Black or African American	39	0.9%

Union Mill Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Union Mill's average per capita income is $112,647. Household income levels show a median of $245,265. The poverty rate stands at 4.14%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.

Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.

Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.

Name	Median	Mean
Families	$250,001	$339,687
Married Families	$250,001	-
Households	$245,265	$302,844
Non Families	$53,750	$95,743

$112,647

Average Income

$245,265

Median Household Income

4.14%

Poverty Rate