There are 10 zip codes in Hardin County, Ohio. The most populated is 43326, located in Kenton. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
4332612,990Kenton
458107,654Ada
458433,769Forest
433102,734Belle Center
433402,001Mount Victory
458121,881Alger
458361,435Dunkirk
45835428Dola
45859380McGuffey
43346201Roundhead

Zip Codes in Hardin County, Ohio by Population (2024)