| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Oil Springs | city | Wyoming | United States | 41.99111 | -106.26694 | 6597 | 27 |
| Old Brooks Place | city | Wyoming | United States | 41.68611 | -106.34083 | 7398 | 47 |
| Old Haymaker Place | city | Wyoming | United States | 41.53222 | -106.88306 | 6797 | 159 |
| Old McKeal Place | city | Wyoming | United States | 41.58861 | -106.95889 | 6797 | 96 |
| Opal | city | Wyoming | United States | 41.76917 | -110.32528 | 6666 | 33 |
| Orchard Valley | city | Wyoming | United States | 41.09667 | -104.81889 | 6089 | 35795 |
| Orin | city | Wyoming | United States | 42.65333 | -105.19194 | 4678 | 56 |
| Orin Junction | city | Wyoming | United States | 42.65583 | -105.18333 | 4691 | 56 |
| Orpha | city | Wyoming | United States | 42.85472 | -105.50306 | 4868 | 28 |
| Osage | city | Wyoming | United States | 43.98083 | -104.42139 | 4304 | 43 |
| Osborne Place | city | Wyoming | United States | 43.09917 | -107.42028 | 6040 | 5 |
| Oshoto | city | Wyoming | United States | 44.5875 | -104.93722 | 4199 | 102 |
| Osmond Community | city | Wyoming | United States | 42.68306 | -110.93139 | 6368 | 1410 |
| Otto | city | Wyoming | United States | 44.40333 | -108.27361 | 4150 | 128 |
| Otto | city | Wyoming | United States | 41.09083 | -105.07444 | 6886 | 98 |
| Owl Creek | city | Wyoming | United States | 43.78111 | -108.56639 | 5600 | 33 |
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