Unionport is a small unincorporated community in Jefferson County, Ohio. It is best known as the birthplace of millionaire, Helen Brach, who was the center of media attention in 1977, when she disappeared. Unionport is located on the banks of the Cross Creek, a large tributary of the Ohio River approximately 20 miles east.
Unionport was platted in 1852. A post office called Unionport was established in 1855, and remained in operation until 2002.
- U.S. Geological Survey Geographic Names Information System: Unionport, Ohio
- "Helen Marie Voorhees Brach". The Charley Project. Retrieved 2015-09-18.
- Doyle, Joseph Beatty (1910). 20th Century History of Steubenville and Jefferson County, Ohio and Representative Citizens. Richmond-Arnold Publishing Company. p. 514.
- "Jefferson County". Jim Forte Postal History. Retrieved 2 January 2016.