| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Wapakoneta | 1 | 9,663 | 9,952 | -0.49% | 1,472 | 7 | City |
| St. Marys | 2 | 8,398 | 8,410 | 0% | 1,799 | 5 | City |
| Minster | 3 | 3,049 | 3,102 | -0.42% | 1,444 | 2 | Village |
| New Bremen | 4 | 3,012 | 3,035 | -0.17% | 1,288 | 2 | Village |
| New Knoxville | 5 | 906 | 938 | -0.66% | 936 | 1 | Village |
| Waynesfield | 6 | 735 | 757 | -0.54% | 1,105 | 1 | Village |
| Buckland | 7 | 226 | 237 | -0.88% | 753 | 0 | Village |
Wapakoneta is the largest city in Auglaize County, with a population of 9,663.
Buckland is the smallest city in Auglaize County, with a population of 226.
There are 7 cities in Auglaize County, Ohio.