Towns
| State | City/Town | Town Title |
|---|---|---|
| Nebraska | O Neill | O Neill, NE |
| Nebraska | Oak | Oak, NE |
| Nebraska | Oakdale | Oakdale, NE |
| Nebraska | Oakland | Oakland, NE |
| Nebraska | Oconto | Oconto, NE |
| Nebraska | Odell | Odell, NE |
| Nebraska | Odessa | Odessa, NE |
| Nebraska | Offutt A F B | Offutt A F B, NE |
| Nebraska | Ogallala | Ogallala, NE |
| Nebraska | Ohiowa | Ohiowa, NE |
| Nebraska | Omaha | Omaha, NE |
| Nebraska | Oneill | Oneill, NE |
| Nebraska | Ong | Ong, NE |
| Nebraska | Orchard | Orchard, NE |
| Nebraska | Ord | Ord, NE |
| Nebraska | Orleans | Orleans, NE |
| Nebraska | Osceola | Osceola, NE |
| Nebraska | Oshkosh | Oshkosh, NE |
| Nebraska | Osmond | Osmond, NE |
| Nebraska | Otoe | Otoe, NE |
| Nebraska | Overton | Overton, NE |
| Nebraska | Oxford | Oxford, NE |
| Nebraska | Page | Page, NE |
| Nebraska | Palisade | Palisade, NE |
| Nebraska | Palmer | Palmer, NE |