Denniston is an unincorporated community in Menifee County, Kentucky, United States. It lies along U.S. Route 460 and Kentucky Route 746, southeast of the city of Frenchburg, the county seat of Menifee County.Rand McNally. The Road Atlas '06. Chicago: Rand McNally, 2006, p. 43. Its elevation is 1,106 feet (337 m)., Geographic Names Information System, 1979-09-20. Accessed 2008-01-03. It has a post office with the ZIP code 40316.USPS – Cities by ZIP Code

Denniston is part of the Mount Sterling Micropolitan Statistical Area.

The community was named for its first postmaster, Joseph C. Denniston.

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