Senecaville is a village in Guernsey County, Ohio, United States.

[5] According to the United States Census Bureau, the village has a total area of 0.48 square miles (1.24 km2), all land.

The lake is a man-made reservoir created in 1937 for flood control and water conservation, and is a popular fishing and recreation destination, the third largest lake in Ohio.

There were 213 housing units at an average density of 443.8 per square mile (171.4/km2).

The racial makeup of the village was 98.9% White, 0.4% Native American, and 0.7% from two or more races.

29.1% of all households were made up of individuals, and 10.4% had someone living alone who was 65 years of age or older.

26.7% of all households were made up of individuals, and 11.4% had someone living alone who was 65 years of age or older.