Casstown is a village in Miami County, Ohio, United States.

[5] The present name honors Lewis Cass, an American military officer, politician, and statesman.

[6] According to the United States Census Bureau, the village has a total area of 0.10 square miles (0.26 km2), all land.

There were 122 housing units at an average density of 1,220.0 per square mile (471.0/km2).

34.5% of all households were made up of individuals, and 14.2% had someone living alone who was 65 years of age or older.

There were 132 housing units at an average density of 1,236.8 per square mile (477.5/km2).

31.5% of all households were made up of individuals, and 15.7% had someone living alone who was 65 years of age or older.