Gladstone was not officially platted. A post office called Gladstone was established in 1886, and remained in operation until 1904.
- U.S. Geological Survey Geographic Names Information System: Gladstone, Ohio
- Broadstone, Michael A. (1918). History of Greene County, Ohio: Its People, Industries and Institutions. B.F. Bowen. p. 316.
- "Greene County". Jim Forte Postal History. Archived from the original on 12 March 2016. Retrieved 13 January 2016.