Union Grove is a city in Upshur County, Texas, United States.

According to the United States Census Bureau, the city has a total area of 1 square mile (2.6 km2) , all land.

[citation needed] As of the census[2] of 2000, there were 346 people, 120 households, and 89 families residing in the city.

There were 130 housing units at an average density of 135.7 per square mile (52.4/km2).

19.2% of all households were made up of individuals, and 8.3% had someone living alone who was 65 years of age or older.