16 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Duchouquet | 1 | 14,394 | 14,678 | -0.19% | 341 | 42 | Township |
| St. Marys | 2 | 10,994 | 11,105 | -0.24% | 298 | 37 | Township |
| Wapakoneta | 3 | 9,748 | 9,955 | -0.35% | 1,485 | 7 | City |
| St. Marys | 4 | 8,363 | 8,401 | -0.07% | 1,792 | 5 | City |
| German | 5 | 3,748 | 3,751 | 0.48% | 203 | 18 | Township |
| Minster | 6 | 3,032 | 3,098 | -0.36% | 1,436 | 2 | Village |
| New Bremen | 7 | 3,010 | 3,040 | -0.17% | 1,287 | 2 | Village |
| Washington | 8 | 1,920 | 1,971 | -0.36% | 62 | 31 | Township |
| Noble | 9 | 1,822 | 1,866 | -0.44% | 59 | 31 | Township |
| Union | 10 | 1,701 | 1,743 | -0.35% | 47 | 36 | Township |
| Moulton | 11 | 1,613 | 1,646 | -0.49% | 58 | 28 | Township |
| Pusheta | 12 | 1,212 | 1,254 | -0.9% | 40 | 30 | Township |
| New Knoxville | 13 | 896 | 938 | -0.78% | 926 | 1 | Village |
| Clay | 14 | 764 | 785 | -0.26% | 25 | 30 | Township |
| Waynesfield | 15 | 734 | 754 | -0.41% | 1,104 | 1 | Village |
| Buckland | 16 | 223 | 237 | -0.89% | 743 | 0 | Village |
Duchouquet is the largest city in Auglaize County, with a population of 14,394.
Buckland is the smallest city in Auglaize County, with a population of 223.
There are 16 cities in Auglaize County, Ohio.