Newtonsville is an unincorporated community and former village in Clermont County, Ohio, United States.

[10] Newtonsville was platted on March 30, 1838, by Stephen Whitaker and Cornelius Washburn.

Despite levying a one-percent income tax, Newtonsville ran a deficit of $112,000 by 2019, prompting the auditor to declare a state of fiscal emergency in the village.

[3][12][13] On November 5, 2019, residents passed an initiative to dissolve the village and return it to Wayne Township by a margin of 53 to 46.

[2] A transition process up to a year long was overseen by the Ohio State Auditor.

[14] According to the United States Census Bureau, the village has a total area of 0.25 square miles (0.65 km2), all land.

The racial makeup of the village was 99.0% White, 0.3% Native American, and 0.8% from two or more races.

18.2% of all households were made up of individuals, and 6% had someone living alone who was 65 years of age or older.