| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| O'Neill's Cross Roads | city | Cill Dara | Ireland | 53.1838889 | -6.9844444 | 400 | 7052 |
| Oakfield | city | Cill Dara | Ireland | 53.2097222 | -6.645 | 469 | 7161 |
| Obelisks | city | Cill Dara | Ireland | 52.9647222 | -6.8516667 | 324 | 7203 |
| Oghill Bridge | city | Cill Dara | Ireland | 53.1216667 | -7.088889 | 229 | 3603 |
| Old Kilcullen | city | Cill Dara | Ireland | 53.1063889 | -6.7652778 | 482 | 7108 |
| Oldcourt | city | Cill Dara | Ireland | 53.0291667 | -6.9852778 | 249 | 6905 |
| Oldgrange | city | Cill Dara | Ireland | 53.0377778 | -6.8661111 | 419 | 7194 |
| Oldtowndonore | city | Cill Dara | Ireland | 53.2486111 | -6.7808333 | 344 | 7161 |
| Oughterard | city | Cill Dara | Ireland | 53.2775 | -6.5638889 | 439 | 21757 |
| OʼNeillʼs Cross Roads | city | Cill Dara | Ireland | 53.1838889 | -6.9844444 | 400 | 7052 |
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