11 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Wapakoneta | 1 | 9,674 | 9,954 | -0.58% | 1,474 | 6.56 | City |
| St. Marys | 2 | 8,358 | 8,405 | -0.11% | 1,790 | 4.67 | City |
| Minster | 3 | 2,959 | 3,059 | -0.67% | 1,401 | 2.11 | Village |
| New Bremen | 4 | 2,937 | 3,039 | -0.68% | 1,256 | 2.34 | Village |
| New Knoxville | 5 | 885 | 935 | -1.12% | 914 | 0.97 | Village |
| Waynesfield | 6 | 725 | 755 | -0.82% | 1,090 | 0.67 | Village |
| Chippewa Park | 7 | 590 | 598 | -3.28% | 1,341 | 0.44 | CDP |
| New Hampshire | 8 | 518 | 556 | 4.65% | 849 | 0.61 | CDP |
| Uniopolis | 9 | 399 | 315 | 7.26% | 1,500 | 0.27 | CDP |
| St. Johns | 10 | 310 | 178 | 2.65% | 807 | 0.38 | CDP |
| Buckland | 11 | 223 | 238 | -1.33% | 743 | 0.30 | Village |
Wapakoneta is the largest city in Auglaize County, with a population of 9,674.
Buckland is the smallest city in Auglaize County.
There are 11 cities in Auglaize County, Ohio.