7 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Wapakoneta | 1 | 9,748 | 9,955 | -0.35% | 1,485 | 7 | City |
| St. Marys | 2 | 8,363 | 8,401 | -0.07% | 1,792 | 5 | City |
| Minster | 3 | 3,032 | 3,098 | -0.36% | 1,436 | 2 | Village |
| New Bremen | 4 | 3,010 | 3,040 | -0.17% | 1,287 | 2 | Village |
| New Knoxville | 5 | 896 | 938 | -0.78% | 926 | 1 | Village |
| Waynesfield | 6 | 734 | 754 | -0.41% | 1,104 | 1 | Village |
| Buckland | 7 | 223 | 237 | -0.89% | 743 | 0 | Village |
Wapakoneta is the largest city in Auglaize County, with a population of 9,748.
Buckland is the smallest city in Auglaize County, with a population of 223.
There are 7 cities in Auglaize County, Ohio.