5 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Defiance | 1 | 17,245 | 17,050 | 0.19% | 1,349 | 13 | City |
| Hicksville | 2 | 3,457 | 3,427 | 0.14% | 1,354 | 3 | Village |
| Sherwood | 3 | 831 | 804 | 0.61% | 533 | 2 | Village |
| Ney | 4 | 299 | 301 | 0% | 763 | 0 | Village |
| Florida | 5 | 213 | 221 | -0.47% | 947 | 0 | Village |
Defiance is the largest city in Defiance County, with a population of 17,245.
Florida is the smallest city in Defiance County, with a population of 213.
There are 5 cities in Defiance County, Ohio.