| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| O'Connor | city | Nebraska | United States | 41.51 | -98.47 | 1975 | |
| O'Fallons | city | Nebraska | United States | 41.16 | -101.08 | 2919 | |
| O'Neill | city | Nebraska | United States | 42.46 | -98.65 | 1998 | |
| Oak | city | Nebraska | United States | 40.24 | -97.90 | 1669 | |
| Oak Mill | city | Nebraska | United States | 40.23 | -97.88 | 1669 | |
| Oakdale | city | Nebraska | United States | 42.07 | -97.97 | 1751 | |
| Oakland | city | Nebraska | United States | 41.84 | -96.47 | 1669 | |
| Obert | city | Nebraska | United States | 42.69 | -97.03 | 1669 | |
| Oconee | city | Nebraska | United States | 41.47 | -97.52 | 1669 | |
| Oconto | city | Nebraska | United States | 41.14 | -99.76 | 2595 | |
| Octavia | city | Nebraska | United States | 41.35 | -97.06 | 1669 | |
| Odell | city | Nebraska | United States | 40.05 | -96.80 | 1669 | |
| Odessa | city | Nebraska | United States | 40.70 | -99.26 | 2509 | |
| Ogallala | city | Nebraska | United States | 41.13 | -101.72 | 3349 | |
| Ohiowa | city | Nebraska | United States | 40.41 | -97.45 | 1669 | |
| Olean | city | Nebraska | United States | 41.56 | -98.81 | 2076 | |
| Olean | city | Nebraska | United States | 41.74 | -96.95 | 1669 | |
| Oliver | city | Nebraska | United States | 41.23 | -103.79 | 5029 | |
| Omaha | city | Nebraska | United States | 41.26 | -95.94 | 1059 | |
| Omaha Regency | city | Nebraska | United States | 41.27 | -96.19 | 1105 | |
| Ong | city | Nebraska | United States | 40.40 | -97.84 | 1669 | |
| Opportunity | city | Nebraska | United States | 42.60 | -98.50 | 1938 | |
| Orafino | city | Nebraska | United States | 40.50 | -100.23 | 2509 | |
| Orchard | city | Nebraska | United States | 42.34 | -98.24 | 1968 | |
| Ord | city | Nebraska | United States | 41.60 | -98.93 | 2083 | |
| Oreapolis | city | Nebraska | United States | 41.05 | -95.92 | 967 | |
| Orella | city | Nebraska | United States | 42.89 | -103.50 | 3697 | |
| Orleans | city | Nebraska | United States | 40.13 | -99.46 | 2050 | |
| Orum | city | Nebraska | United States | 41.55 | -96.27 | 1669 | |
| Osceola | city | Nebraska | United States | 41.18 | -97.55 | 1669 | |
| Oshkosh | city | Nebraska | United States | 41.40 | -102.34 | 3392 | |
| Osmond | city | Nebraska | United States | 42.36 | -97.60 | 1669 | |
| Otis Motel and Trailer Court | city | Nebraska | United States | 42.80 | -102.20 | 3599 | |
| Otoe | city | Nebraska | United States | 40.72 | -96.12 | 1125 | |
| Ough | city | Nebraska | United States | 40.32 | -101.51 | 3349 | |
| Overland | city | Nebraska | United States | 41.08 | -97.99 | 1699 | |
| Overton | city | Nebraska | United States | 40.74 | -99.54 | 2509 | |
| Ovina | city | Nebraska | United States | 40.97 | -98.46 | 1889 | |
| Owasco | city | Nebraska | United States | 41.24 | -103.57 | 5029 | |
| Oxford | city | Nebraska | United States | 40.25 | -99.63 | 2509 | |
| Oxford Junction | city | Nebraska | United States | 40.24 | -99.60 | 2096 |