New Plymouth is an unincorporated community in northwestern Brown Township, Vinton County, Ohio, United States. Although it is unincorporated, it has a post office, with the ZIP code of 45654. It is located at the intersection of State Routes 56 and 328 in the county's far northeast.
A post office has been in operation at New Plymouth since 1850. New Plymouth was named after Plymouth, Massachusetts, the native home of a large share of the early settlers.
Coordinates: 39°23′05″N 82°23′47″W / 39.38472°N 82.39639°W