14 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 44883 | Tiffin | 28,102 |
| 44830 | Fostoria | 18,671 |
| 44836 | Green Springs | 2,496 |
| 44867 | Republic | 2,345 |
| 44807 | Attica | 2,244 |
| 44818 | Bloomville | 1,989 |
| 44853 | New Riegel | 1,391 |
| 44802 | Alvada | 746 |
| 44844 | McCutchenville | 744 |
| 44815 | Bettsville | 710 |
| 44841 | Kansas | 498 |
| 44828 | Flat Rock | 138 |
| 44809 | Bascom | 103 |
| 44861 | Old Fort | 31 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 14 ZCTAs in Seneca County, Ohio (US Census).