Oak Grove is a town in Pawnee County, Oklahoma, United States.

[5] According to the United States Census Bureau, the town has a total area of 0.1 square miles (0.26 km2), all land.

There were 9 housing units at an average density of 69.0 per square mile (26.6/km2).

25.0% of all households were made up of individuals, and 12.5% had someone living alone who was 65 years of age or older.

There were no families and 20.0% of the population living below the poverty line, including no under eighteens and 50.0% of those over 64.