| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Oakley | city | Idaho | United States | 42.24333 | -113.88111 | 4589 | 112 |
| Obsidian | city | Idaho | United States | 44.07889 | -114.84639 | 6797 | 14 |
| Oden | city | Idaho | United States | 48.32222 | -116.41167 | 2391 | 1037 |
| Ola | city | Idaho | United States | 44.17833 | -116.29167 | 3152 | 290 |
| Old Beaver | city | Idaho | United States | 44.41056 | -112.19639 | 5980 | 19 |
| Old Fort | city | Idaho | United States | 44.81167 | -116.15667 | 4898 | 257 |
| Old Golden | city | Idaho | United States | 45.78917 | -115.65278 | 4776 | 14 |
| Old Williamsburg historical | city | Idaho | United States | 42.94278 | -111.33972 | 6771 | 112 |
| Oldtown | city | Idaho | United States | 48.17889 | -117.03694 | 2230 | 2212 |
| Olsen | city | Idaho | United States | 43.28528 | -112.62111 | 4599 | 215 |
| Olsons | city | Idaho | United States | 47.00278 | -115.12917 | 5518 | 41 |
| Omega | city | Idaho | United States | 47.33389 | -116.4775 | 2775 | 503 |
| Omill | city | Idaho | United States | 46.49389 | -115.92583 | 2992 | 61 |
| Onaway | city | Idaho | United States | 46.92833 | -116.89 | 2598 | 369 |
| Ora | city | Idaho | United States | 44.08611 | -111.5325 | 5196 | 117 |
| Orchard | city | Idaho | United States | 43.31472 | -116.02528 | 3166 | 457 |
| Orchard Homes historical | city | Idaho | United States | 46.59667 | -116.72889 | 1581 | 480 |
| Oreana | city | Idaho | United States | 43.05361 | -116.39417 | 2798 | 19 |
| Oro Fino historical | city | Idaho | United States | 46.48222 | -115.79667 | 3198 | 61 |
| Orofino | city | Idaho | United States | 46.47944 | -116.25417 | 1197 | 2046 |
| Orogrande | city | Idaho | United States | 45.70556 | -115.5425 | 4816 | 14 |
| Orvin | city | Idaho | United States | 43.53333 | -112.00861 | 4773 | 46962 |
| Osburn | city | Idaho | United States | 47.50611 | -115.99833 | 2598 | 977 |
| Osgood | city | Idaho | United States | 43.57028 | -112.10222 | 4799 | 6212 |
| Outlet Bay | city | Idaho | United States | 48.49444 | -116.89222 | 3083 | 112 |
| Ovid | city | Idaho | United States | 42.28889 | -111.3975 | 5925 | 239 |
| Owinza | city | Idaho | United States | 42.89944 | -114.05583 | 4196 | 131 |
| Owyhee | city | Idaho | United States | 43.41833 | -116.19972 | 2998 | 448 |
| Owyhee Heights | city | Idaho | United States | 43.62472 | -116.98972 | 2398 | 2394 |
| Oxford | city | Idaho | United States | 42.25889 | -112.02056 | 4783 | 399 |
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