Hardin was platted in 1816. The community was named for John Hardin (1753–1792), a Continental Army officer in the American Revolutionary War. Hardin was the county seat from 1819 until 1820. A post office called Hardin was established in 1820, and discontinued in 1909.
- U.S. Geological Survey Geographic Names Information System: Hardin, Ohio
- Hitchcock, Almon Baldwin Carrington (1913). History of Shelby County, Ohio, and representative citizens. p. 386.
- "Shelby County". Jim Forte Postal History. Retrieved 24 December 2015.
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