Iowa cities which start with the letter O.
| Place | Place Type | 2010 Population |
|---|---|---|
| Oakdale | ||
| Oakland | city | 1527 |
| Oakland Acres | city | 156 |
| Oakley | ||
| Oakville | city | 173 |
| Oakwood | ||
| Oasis | ||
| Ocheyedan | city | 490 |
| Odebolt | city | 1013 |
| Oelwein | city | 6415 |
| Ogden | city | 2044 |
| Okoboji | city | 807 |
| Old Town | ||
| Olds | city | 229 |
| Olin | city | 698 |
| Olivet | ||
| Ollie | city | 215 |
| Onawa | city | 2998 |
| Oneida | ||
| Onslow | city | 197 |
| Oralabor | ||
| Oran | ||
| Orange City | city | 6004 |
| Orchard | city | 71 |
| Orient | city | 408 |
| Orillia | ||
| Osage | city | 3619 |
| Osborne | ||
| Osceola | city | 4929 |
| Osgood | ||
| Oskaloosa | city | 11463 |
| Ossian | city | 845 |
| Osterdock | city | 59 |
| Otho | city | 542 |
| Otley | ||
| Oto | city | 108 |
| Otranto | ||
| Otter Creek | ||
| Otterville | ||
| Ottosen | city | 55 |
| Ottumwa | city | 25023 |
| Ottumwa Junction | ||
| Owasa | city | 43 |
| Owego | ||
| Oxford | city | 807 |
| Oxford Junction | city | 496 |
| Oxford Mills | ||
| Oyens | city | 103 |
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