| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Labbanacallee | city | Ireland | 52.18 | -8.10 | 859 | 1062 | |
| Lackandarra | city | Ireland | 52.17 | -7.70 | 830 | 1103 | |
| Lackandarra Upper | city | Ireland | 52.18 | -7.69 | 830 | 1075 | |
| Lagnagoushee | city | Ireland | 52.03 | -7.62 | 830 | 4476 | |
| Lemybrien | city | Ireland | 52.17 | -7.52 | 236 | 1376 | |
| Leperstown | city | Ireland | 52.16 | -7.04 | 134 | 3027 | |
| Lickoran | city | Ireland | 52.18 | -7.76 | 410 | 1087 | |
| Licky Bridge | city | Ireland | 52.00 | -7.82 | 150 | 3919 | |
| Lickybeg | city | Ireland | 52.03 | -7.75 | 830 | 985 | |
| Lios Mór | city | Ireland | 52.14 | -7.93 | 285 | 2090 | |
| Liskeety | city | Ireland | 52.00 | -7.72 | 344 | 1293 | |
| Lismore | city | Ireland | 52.14 | -7.93 | 285 | 2090 | |
| Lisnageragh | city | Ireland | 52.15 | -7.40 | 98 | 1314 | |
| Lisnakill | city | Ireland | 52.21 | -7.21 | 249 | 5105 | |
| Lisnakill Cross | city | Ireland | 52.21 | -7.20 | 249 | 8272 | |
| Lisscrow | city | Ireland | 51.99 | -7.72 | 190 | 1238 | |
| Lisselan | city | Ireland | 52.17 | -7.10 | 13 | 7198 | |
| Log na Giumhaisi | city | Ireland | 52.03 | -7.62 | 830 | 4476 | |
| Logleagh | city | Ireland | 52.18 | -8.01 | 830 | 938 | |
| Loiscreán | city | Ireland | 52.02 | -7.62 | 830 | 1353 | |
| Lombard's Cross Roads | city | Ireland | 51.98 | -7.90 | 196 | 7444 | |
| Lombard’s Cross Roads | city | Ireland | 51.98 | -7.90 | 196 | 7444 | |
| Loskeran | city | Ireland | 52.02 | -7.62 | 830 | 1353 | |
| Lowry's Bridge | city | Ireland | 52.29 | -7.38 | 183 | 2688 | |
| Lowry’s Bridge | city | Ireland | 52.29 | -7.38 | 183 | 2688 | |
| Lyon's Cross Roads | city | Ireland | 52.14 | -8.04 | 246 | 1272 | |
| Lyon’s Cross Roads | city | Ireland | 52.14 | -8.04 | 246 | 1272 | |
| Lyrattin | city | Ireland | 52.18 | -7.75 | 367 | 1063 | |
| Lyre | city | Ireland | 52.20 | -7.49 | 249 | 1505 | |
| Lyre | city | Ireland | 52.26 | -7.62 | 1072 | 560 | |
| Lyrenacatlee | city | Ireland | 52.17 | -7.90 | 830 | 1998 | |
| Lyrenaglogle | city | Ireland | 52.16 | -8.12 | 830 | 1099 |