| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Lacka | city | Ireland | 52.64 | -8.26 | 830 | 1691 | |
| Lackendarragh | city | Ireland | 52.33 | -8.29 | 830 | 1746 | |
| Laghtane | city | Ireland | 52.67 | -8.48 | 180 | 6859 | |
| Landsdowne Bridge | city | Ireland | 52.68 | -8.69 | 3 | 36493 | |
| Lisheemine Bridge | city | Ireland | 52.43 | -9.03 | 193 | 6284 | |
| Lismullane | city | Ireland | 52.63 | -8.48 | 183 | 5095 | |
| Loghill | city | Ireland | 52.48 | -8.99 | 170 | 2571 | |
| Longford Bridge | city | Ireland | 52.54 | -8.52 | 246 | 2346 | |
| Longford Bridge | city | Ireland | 52.56 | -8.23 | 242 | 2506 | |
| Longstone | city | Ireland | 52.56 | -8.41 | 295 | 2240 | |
| Loughgur Cross | city | Ireland | 52.51 | -8.51 | 282 | 2374 | |
| Luddenbeg | city | Ireland | 52.59 | -8.53 | 298 | 7374 | |
| Lyre | city | Ireland | 52.37 | -8.29 | 830 | 1686 |