24 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Oakdale | Washington County | 28,198 |
| Owatonna | Steele County | 26,611 |
| Otsego | Wright County | 25,285 |
| Oak Grove | Anoka County | 9,357 |
| Orono | Carver County | 7,992 |
| Oak Park Heights | Washington County | 4,569 |
| Osseo | Hennepin County | 2,419 |
| Olivia | Renville County | 2,250 |
| Ortonville | Big Stone County | 1,965 |
| Oronoco | Olmsted County | 1,761 |
| Osakis | Douglas County | 1,742 |
| Onamia | Mille Lacs County | 866 |
| Ottertail | Otter Tail County | 755 |
| Oklee | Red Lake County | 408 |
| Ogilvie | Kanabec County | 405 |
| Oslo | Marshall County | 234 |
| Ostrander | Fillmore County | 222 |
| Orr | St. Louis County | 209 |
| Okabena | Jackson County | 207 |
| Ogema | Becker County | 199 |
| Osage | Becker County | 183 |
| Ormsby | Martin County | 123 |
| Odin | Watonwan County | 121 |
| Odessa | Big Stone County | 104 |