Indiana cities which start with the letter O.
| Place | Place Type | 2010 Population |
|---|---|---|
| Oak Grove | township | 1581 |
| Oakford | ||
| Oakland City | city | 2429 |
| Oaklandon | ||
| Oaktown | town | 608 |
| Oakville | ||
| Oakwood | ||
| Oakwood Shores | ||
| Oatsville | ||
| Ober | ||
| Odon | town | 1354 |
| Ogden | ||
| Ogden Dunes | town | 1110 |
| Oil | township | 2546 |
| Oldenburg | town | 674 |
| Onward | town | 100 |
| Oolitic | town | 1184 |
| Ora | ||
| Orange | township | 796 |
| Orangeville | township | 658 |
| Orestes | town | 414 |
| Oriole | ||
| Orland | town | 434 |
| Orleans | town | 2142 |
| Ormas | ||
| Osceola | town | 2463 |
| Osgood | town | 1624 |
| Ossian | town | 3289 |
| Otis | ||
| Otisco | ||
| Otsego | township | 2575 |
| Otter Lake | ||
| Otterbein | town | 367 |
| Otwell | ||
| Owensburg | ||
| Owensville | town | 1284 |
| Oxford | town | 1162 |
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