ZIP CodesZIP codes in Hardin County, Ohio
Hardin County, Ohio has 10 ZIP codes in this list, from 43326 to 45859. They cover 10 places, among them Kenton, Mount Victory, Ridgeway and Roundhead.
| ZIP code | Place | Land area (sq mi) | Map point |
|---|---|---|---|
| 43326 | Kenton | 186 | 40.640, -83.611 |
| 43340 | Mount Victory | 48.7 | 40.523, -83.494 |
| 43345 | Ridgeway | 28.5 | 40.521, -83.570 |
| 43346 | Roundhead | 1.1 | 40.573, -83.846 |
| 45810 | Ada | 65.6 | 40.771, -83.815 |
| 45812 | Alger | 38.8 | 40.706, -83.825 |
| 45835 | Dola | 18.5 | 40.760, -83.700 |
| 45836 | Dunkirk | 24.7 | 40.782, -83.634 |
| 45843 | Forest | 101 | 40.782, -83.535 |
| 45859 | Mc Guffey | 0.3 | 40.690, -83.811 |
The ZIP code areas of Hardin County add up to about 513 square miles of land (1,330 sq km) as the Census Bureau draws them. The largest is 43326 (Kenton), with 186 square miles.
Using these codes
- In an address, the ZIP code comes last, after the city and the two-letter state: Kenton, OH 43326.
- Tap a ZIP code to open it in the look-up, with a copy button for the address line.
- A code can cross a county line, and one town can have several codes. The table shows the main place of each code.
- "No area" means the Census Bureau draws no area for that code. Such codes are usually for post office boxes or a single building.
Places and counties: GeoNames. Areas: U.S. Census Bureau, 2024 ZIP Code Tabulation Areas. Checked in November 2026. This site is not connected with the United States Postal Service; for mailing, confirm the address with USPS.