| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Old Bride Bridge | city | Cork | Ireland | 52.06 | -8.42 | 830 | 1155 |
| Old Chapel Cross Roads | city | Cork | Ireland | 51.81 | -8.69 | 314 | 3176 |
| Old Courth | city | Cork | Ireland | 51.86 | -8.39 | 282 | 40781 |
| Old Port House | city | Cork | Ireland | 51.79 | -8.79 | 331 | 2453 |
| Old Twopothouse Cross Roads | city | Cork | Ireland | 52.18 | -8.63 | 308 | 8859 |
| Oldcastletown | city | Cork | Ireland | 52.26 | -8.43 | 291 | 1609 |
| Oldchapel | city | Cork | Ireland | 51.74 | -8.79 | 249 | 5283 |
| Oldcourt | city | Cork | Ireland | 51.67 | -8.57 | 232 | 2506 |
| Ovens | city | Cork | Ireland | 51.87 | -8.67 | 282 | 6106 |
| Oysterhaven | city | Cork | Ireland | 51.69 | -8.44 | 0 | 1490 |