20 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Duchouquet township | 1 | 14,415 | 14,684 | 0.03% | 342 | 42.17 | Township |
| St. Marys township | 2 | 10,959 | 11,103 | -0.23% | 297 | 36.84 | Township |
| Wapakoneta | 3 | 9,674 | 9,954 | -0.58% | 1,474 | 6.56 | City |
| St. Marys | 4 | 8,358 | 8,405 | -0.11% | 1,790 | 4.67 | City |
| German township | 5 | 3,684 | 3,750 | 0.16% | 200 | 18.45 | Township |
| Minster | 6 | 2,959 | 3,059 | -0.67% | 1,401 | 2.11 | Village |
| New Bremen | 7 | 2,937 | 3,039 | -0.68% | 1,256 | 2.34 | Village |
| Washington township | 8 | 1,924 | 1,966 | -0.05% | 62 | 31.07 | Township |
| Noble township | 9 | 1,837 | 1,871 | -0.16% | 60 | 30.67 | Township |
| Union township | 10 | 1,701 | 1,743 | -0.23% | 47 | 35.88 | Township |
| Moulton township | 11 | 1,629 | 1,646 | 0.06% | 58 | 27.88 | Township |
| Pusheta township | 12 | 1,248 | 1,254 | 0.32% | 41 | 30.26 | Township |
| New Knoxville | 13 | 885 | 935 | -1.12% | 914 | 0.97 | Village |
| Clay township | 14 | 770 | 786 | 0.26% | 25 | 30.30 | Township |
| Waynesfield | 15 | 725 | 755 | -0.82% | 1,090 | 0.67 | Village |
| Chippewa Park | 16 | 590 | 598 | -3.28% | 1,341 | 0.44 | CDP |
| New Hampshire | 17 | 518 | 556 | 4.65% | 849 | 0.61 | CDP |
| Uniopolis | 18 | 399 | 315 | 7.26% | 1,500 | 0.27 | CDP |
| St. Johns | 19 | 310 | 178 | 2.65% | 807 | 0.38 | CDP |
| Buckland | 20 | 223 | 238 | -1.33% | 743 | 0.30 | Village |
Duchouquet township is the largest city in Auglaize County, with a population of 14,415.
Buckland is the smallest city in Auglaize County.
There are 20 cities in Auglaize County, Ohio.