8 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 43512 | Defiance | 28,435 |
| 43526 | Hicksville | 5,559 |
| 43556 | Sherwood | 1,682 |
| 43549 | Ney | 1,353 |
| 43519 | Evansport | 378 |
| 43536 | Mark Center | 216 |
| 43520 | Farmer | 17 |
| 43530 | Jewell | 0 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 8 ZCTAs in Defiance County, Ohio (US Census).