Coal Run is an unincorporated community in northeastern Waterford Township, Washington County, Ohio, United States.

[5] A post office called Coal Run was established in 1837, and remained in operation until 1997.

Eighty-seven buildings in the community, plus two other non-building sites, compose the historic district, which covers an area of approximately 138 acres (56 ha).

Varied as well are the uses of the buildings: many houses are present, but shops, a post office, and a cemetery are also included within its boundaries.

One of the community's residences is known as the Mason House; built in 1802, it is listed on the National Register by itself as well as qualifying as a contributing property to the district.