Union Mill is a

census designated place A census-designated place (CDP) is a Place (United States Census Bureau), concentration of population defined by the United States Census Bureau for statistical purposes only. CDPs have been used in each decennial census since 1980 as the counte ...

Fairfax County, Virginia Fairfax County, officially the County of Fairfax, is a County (United States), county in the Commonwealth (U.S. state), Commonwealth of Virginia. With a population of 1,150,309 as of the 2020 United States census, 2020 census, it is the most p ...

, United States.

Demographics

Union Mill first appeared as a

in the 2020 U.S. Census.

References

Census-designated places in Fairfax County, Virginia Washington metropolitan area Census-designated places in Virginia {{FairfaxCountyVA-geo-stub