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
City
Population
43326Kenton12,990
45810Ada7,654
45843Forest3,769
43310Belle Center2,734
43340Mount Victory2,001
45812Alger1,881
45836Dunkirk1,435
45835Dola428
45859McGuffey380
43346Roundhead201

Hardin County, Ohio Zip Codes by Population (2024)