| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Oaklands | city | Tiobraid Arann | Ireland | 52.36 | -7.77 | 177 | 8247 |
| Oldgrange | city | Tiobraid Arann | Ireland | 52.32 | -7.84 | 262 | 2238 |
| Orkneys Cross Roads | city | Tiobraid Arann | Ireland | 52.86 | -7.85 | 485 | 1009 |
| Outeragh | city | Tiobraid Arann | Ireland | 52.42 | -7.88 | 259 | 2513 |