20 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Minneapolis | 1 | 1,933 | 1,940 | -0.05% | 1,055 | 1.83 | City |
| Bennington township | 2 | 1,292 | 1,237 | 0.62% | 31 | 42.02 | Township |
| Bennington | 3 | 655 | 620 | 1.08% | 1,560 | 0.42 | City |
| Sheridan township | 4 | 414 | 411 | 0% | 11 | 36.26 | Township |
| Morton township | 5 | 408 | 400 | 0.49% | 11 | 35.86 | Township |
| Delphos | 6 | 301 | 301 | 0% | 508 | 0.59 | City |
| Tescott | 7 | 263 | 265 | 0% | 681 | 0.39 | City |
| Concord township | 8 | 252 | 246 | 0% | 7 | 34.69 | Township |
| Culver township | 9 | 227 | 229 | -0.87% | 6 | 36.18 | Township |
| Richland township | 10 | 225 | 214 | 0.9% | 6 | 35.65 | Township |
| Mentor | 11 | 164 | 74 | 7.19% | 424 | 0.39 | CDP |
| Fountain township | 12 | 150 | 144 | 0.67% | 4 | 36.18 | Township |
| Buckeye township | 13 | 118 | 115 | 0% | 4 | 30.02 | Township |
| Blaine township | 14 | 106 | 103 | 0% | 3 | 36.20 | Township |
| Grant township | 15 | 94 | 91 | 0% | 3 | 36.21 | Township |
| Center township | 16 | 85 | 76 | 3.66% | 2 | 35.58 | Township |
| Stanton township | 17 | 48 | 42 | 4.35% | 1 | 36.61 | Township |
| Sherman township | 18 | 41 | 39 | 0% | 1 | 36.17 | Township |
| Henry township | 19 | 29 | 29 | 0% | 1 | 35.85 | Township |
| Bavaria | 20 | 27 | 47 | 3.85% | 118 | 0.23 | CDP |
Minneapolis is the largest city in Ottawa County, with a population of 1,933.
Bavaria is the smallest city in Ottawa County.
There are 20 cities in Ottawa County, Kansas.