The Wilmington Public Library of Clinton County, one of 111 Carnegie libraries in Ohio, opened on June 30, 1904. A $12,500 gift from steel magnate and philanthropist Andrew Carnegie financed construction of the original 3,360-square-foot building. The community provided the building site, formerly known as Martin Field, and pledged tax funds for the library's ongoing operation and maintenance. Later expansions and modernizations incorporated the original building and preserved its historic architectural style.