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. Demographics Union Mill first appeared as a census designated place in the 2020 U.S. census.

2020 census +Union Mill CDP, Virginia – Racial and ethnic compositionRace / Ethnicity (NH = Non-Hispanic)Pop 20202020White alone (NH) 3,285 65.74%Black or African American alone (NH) 140 2.80%Native American or Alaska Native alone (NH)60.12%Asian alone (NH) 98419.69%Native Hawaiian or Pacific Islander alone (NH)20.04%Other race alone (NH)30 0.60%Mixed race or Multiracial (NH) 243 4.86%Hispanic or Latino (any race)307 6.14%Total4,997 100.00%

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