Williamsport is a village in Pickaway County, Ohio, United States.

With the cancellation of the solar power array, the village lost an estimated $3.6 million per year in tax revenue (most of which was intended for public schools).

There were 377 housing units at an average density of 208.3 per square mile (80.4/km2).

17.0% of all households were made up of individuals, and 8.7% had someone living alone who was 65 years of age or older.

19.7% of all households were made up of individuals, and 9.6% had someone living alone who was 65 years of age or older.

The village of Williamsport hosts the annual "Deer Creek Dam Days" festival on the final weekend of May.

Events center around the Deercreek reservoir dam as well as rural lifestyles.