Gratis is a village in Preble County, Ohio, United States.

[6] According to the United States Census Bureau, the village has a total area of 0.97 square miles (2.51 km2), all land.

There were 370 housing units at an average density of 381.4 per square mile (147.3/km2).

22.0% of all households were made up of individuals, and 7.7% had someone living alone who was 65 years of age or older.

There were 361 housing units at an average density of 382.3 per square mile (147.6/km2).

23.8% of all households were made up of individuals, and 7.7% had someone living alone who was 65 years of age or older.