| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Laffansbridge | city | Ireland | 52.58 | -7.72 | 830 | 2028 | |
| Lagganstown | city | Ireland | 52.46 | -7.97 | 242 | 1588 | |
| Lagghishanaquilla | city | Ireland | 52.38 | -8.09 | 1712 | 818 | |
| Laght Cross Roads | city | Ireland | 52.32 | -7.99 | 242 | 1127 | |
| Lassaha | city | Ireland | 52.59 | -7.75 | 830 | 1732 | |
| Lattin | city | Ireland | 52.47 | -8.28 | 830 | 1852 | |
| Leugh | city | Ireland | 52.62 | -8.18 | 980 | 1467 | |
| Levally | city | Ireland | 52.40 | -7.79 | 334 | 3022 | |
| Limerick Junction | city | Ireland | 52.50 | -8.20 | 830 | 6916 | |
| Lisfunshion | city | Ireland | 52.28 | -8.08 | 275 | 1177 | |
| Lisnamuck | city | Ireland | 52.36 | -7.86 | 262 | 2616 | |
| Lisnatubbrid | city | Ireland | 52.41 | -7.63 | 364 | 2780 | |
| Lisronagh | city | Ireland | 52.42 | -7.70 | 229 | 5666 | |
| Lissadober | city | Ireland | 52.40 | -7.47 | 206 | 1410 | |
| Lisvarrinane | city | Ireland | 52.41 | -8.25 | 390 | 1462 | |
| Loch Ceann | city | Ireland | 52.44 | -7.88 | 311 | 1820 | |
| Longford | city | Ireland | 52.39 | -8.22 | 902 | 1037 | |
| Losset | city | Ireland | 52.64 | -8.14 | 987 | 1135 | |
| Loughacutteen | city | Ireland | 52.34 | -7.96 | 249 | 3073 | |
| Loughcapple Bridge | city | Ireland | 52.43 | -7.65 | 167 | 2511 | |
| Loughkent House | city | Ireland | 52.43 | -7.87 | 354 | 1611 | |
| Loughtally | city | Ireland | 52.35 | -7.78 | 144 | 6143 |