38 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Minneapolis | 1 | 1,939 | 1,939 | 0% | 1,058 | 2 | City |
| Minneapolis | 2 | 1,939 | 1,939 | 0% | 1,058 | 2 | City |
| Bennington | 3 | 1,304 | 1,238 | 0.85% | 31 | 42 | Township |
| Bennington | 4 | 1,304 | 1,238 | 0.85% | 31 | 42 | Township |
| Bennington | 5 | 656 | 619 | 1.08% | 1,562 | 0 | City |
| Bennington | 6 | 656 | 619 | 1.08% | 1,562 | 0 | City |
| Sheridan | 7 | 414 | 410 | 0% | 11 | 36 | Township |
| Sheridan | 8 | 414 | 410 | 0% | 11 | 36 | Township |
| Morton | 9 | 405 | 400 | 0% | 11 | 36 | Township |
| Morton | 10 | 405 | 400 | 0% | 11 | 36 | Township |
| Delphos | 11 | 301 | 300 | 0% | 508 | 1 | City |
| Delphos | 12 | 301 | 300 | 0% | 508 | 1 | City |
| Tescott | 13 | 266 | 266 | 0% | 689 | 0 | City |
| Tescott | 14 | 266 | 266 | 0% | 689 | 0 | City |
| Concord | 15 | 259 | 248 | 0.78% | 7 | 35 | Township |
| Concord | 16 | 259 | 248 | 0.78% | 7 | 35 | Township |
| Culver | 17 | 235 | 231 | 0% | 6 | 36 | Township |
| Culver | 18 | 235 | 231 | 0% | 6 | 36 | Township |
| Richland | 19 | 222 | 214 | 0% | 6 | 36 | Township |
| Richland | 20 | 222 | 214 | 0% | 6 | 36 | Township |
| Mentor | 21 | 164 | 74 | 7.19% | 424 | 0 | CDP |
| Fountain | 22 | 149 | 144 | 0% | 4 | 36 | Township |
| Fountain | 23 | 149 | 144 | 0% | 4 | 36 | Township |
| Buckeye | 24 | 118 | 116 | -0.84% | 4 | 30 | Township |
| Buckeye | 25 | 118 | 116 | -0.84% | 4 | 30 | Township |
| Blaine | 26 | 106 | 103 | 0% | 3 | 36 | Township |
| Blaine | 27 | 106 | 103 | 0% | 3 | 36 | Township |
| Grant | 28 | 94 | 91 | 0% | 3 | 36 | Township |
| Grant | 29 | 94 | 91 | 0% | 3 | 36 | Township |
| Center | 30 | 79 | 76 | 0% | 2 | 36 | Township |
| Center | 31 | 79 | 76 | 0% | 2 | 36 | Township |
| Stanton | 32 | 46 | 42 | 4.55% | 1 | 37 | Township |
| Stanton | 33 | 46 | 42 | 4.55% | 1 | 37 | Township |
| Sherman | 34 | 41 | 39 | 0% | 1 | 36 | Township |
| Sherman | 35 | 41 | 39 | 0% | 1 | 36 | Township |
| Henry | 36 | 28 | 28 | 0% | 1 | 36 | Township |
| Henry | 37 | 28 | 28 | 0% | 1 | 36 | Township |
| Bavaria | 38 | 27 | 47 | 3.85% | 118 | 0 | CDP |
Minneapolis is the largest city in Ottawa County, with a population of 1,939.
Bavaria is the smallest city in Ottawa County, with a population of 27.
There are 38 cities in Ottawa County, Kansas.