| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| One Hundred Palms | city | California | United States | 33.56 | -116.17 | -1689 | |
| Ono | city | California | United States | 40.48 | -122.62 | 918 | |
| Ontario | city | California | United States | 34.06 | -117.65 | 990 | |
| Onyx | city | California | United States | 35.69 | -118.22 | 2821 |