Union Hall is a census-designated place (CDP) in Franklin County, Virginia, United States.

As of the census[1] of 2018, there were 1,091 people, 499 households, and 390 families residing in the CDP.

There were 1,103 housing units at an average density of 61.3/sq mi (23.6/km2).

The racial makeup of the CDP was 94.2% White, 2.4% African American, 1.7% Asian, and 1.6% from two or more races.

20.4% of all households were made up of individuals, and 13.8% had someone living alone who was 65 years of age or older.