Hamersville (/ˈheɪmərzvɪl/ HAY-mərz-vil[6]) is a village in Clark Township, Brown County, Ohio, United States.

[8] According to the United States Census Bureau, the village has a total area of 0.39 square miles (1.01 km2), all land.

There were 206 housing units at an average density of 528.2 per square mile (203.9/km2).

19.1% of all households were made up of individuals, and 7.5% had someone living alone who was 65 years of age or older.

The racial makeup of the village was 99.61% White, 0.19% African American, and 0.19% from two or more races.

17.8% of all households were made up of individuals, and 7.2% had someone living alone who was 65 years of age or older.