City | 2024 Population |
|---|---|
| O'Brien | 43 |
| Oak | 646 |
| Oak Grove | 9,275 |
| Oak Lawn | 1,853 |
| Oak Park | 106 |
| Oak Park Heights | 4,623 |
| Oak Valley | 370 |
| Oakdale | 28,212 |
| Oakland | 353 |
| Oakport | 501 |
| Oakwood | 394 |
| Odessa | 104 |
| Odin | 122 |
| Ogema | 201 |
| Ogilvie | 402 |
| Okabena | 207 |
| Oklee | 409 |
| Olivia | 2,269 |
| Olney | 154 |
| Omro | 127 |
| Onamia | 848 |
| Onstad | 63 |
| Orange | 350 |
| Orion | 535 |
| Ormsby | 122 |
| Orono | 8,055 |
| Oronoco | 1,771 |
| Orr | 210 |
| Orrock | 3,732 |
| Orton | 213 |
| Ortonville | 1,974 |
| Orwell | 151 |
| Osage | 221 |
| Osakis | 1,747 |
| Osborne | 298 |
| Oscar | 206 |
| Osceola | 124 |
| Oshawa | 575 |
| Oshkosh | 195 |
| Oslo | 236 |
| Osseo | 2,470 |
| Ostrander | 223 |
| Oteneagen | 313 |
| Otisco | 532 |
| Otrey | 66 |
| Otsego | 24,263 |
| Ottawa | 296 |
| Otter Tail | 604 |
| Otter Tail Peninsula | 69 |
| Ottertail | 732 |
| Otto | 605 |
| Owatonna | 26,572 |
| Owens | 252 |
| Oxford | 1,010 |