| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Old Mountain | city | County Donegal | Ireland | 55.1980556 | -7.4936111 | 675 | 1831 |
| Old Town | city | County Donegal | Ireland | 54.9419444 | -7.7411111 | 246 | 2310 |
| Old Town | city | County Donegal | Ireland | 55.0761111 | -7.6138889 | 29 | 1656 |
| Oldtown | city | County Donegal | Ireland | 55.1155556 | -8.1069444 | 252 | 2122 |
| Owenea Bridge | city | County Donegal | Ireland | 54.7763889 | -8.41 | 75 | 2201 |
|
|