| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Onan | city | Virginia | United States | 37.99 | -78.82 | 830 | |
| Onancock | city | Virginia | United States | 37.71 | -75.75 | 19 | |
| Onemo | city | Virginia | United States | 37.40 | -76.27 | 3 | |
| Onley | city | Virginia | United States | 37.69 | -75.72 | 42 | |
| Ontario | city | Virginia | United States | 36.99 | -78.49 | 830 | |
| Onville (historical) | city | Virginia | United States | 38.49 | -77.44 | 147 |