Union Furnace, Ohio

Union Furnace is an unincorporated community in northern Starr Township, Hocking County, Ohio, United States. Although it is unincorporated, it has a post office, with the ZIP code of 43158. It is located along State Route 328, which forms the main street in Union Furnace.

Union Furnace originally referred to a blast furnace built on site in the 1850s. A post office has been in operation at Union Furnace since 1873.