| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Laragh | city | County Monaghan | Ireland | 54.0452778 | -6.7736111 | 495 | 3494 |
| Latnamard | city | County Monaghan | Ireland | 54.1741667 | -7.0580556 | 498 | 3483 |
| Lattacrom | city | County Monaghan | Ireland | 54.0669444 | -6.8427778 | 498 | 3478 |
| Latton | city | County Monaghan | Ireland | 54.0697222 | -6.9480556 | 501 | 3262 |
| Leitrim | city | County Monaghan | Ireland | 54.2702778 | -6.8897222 | 209 | 3862 |
| Lemgare | city | County Monaghan | Ireland | 54.2025 | -6.7911111 | 498 | 4682 |
| Lemgare Rocks | city | County Monaghan | Ireland | 54.1919444 | -6.7697222 | 498 | 4682 |
| Lennaght | city | County Monaghan | Ireland | 54.285 | -7.1627778 | 387 | 3275 |
| Lisdoonan | city | County Monaghan | Ireland | 54.0263889 | -6.7511111 | 485 | 3505 |
| Lisgall | city | County Monaghan | Ireland | 54.063889 | -6.7263889 | 501 | 3496 |
| Lisgillan | city | County Monaghan | Ireland | 54.1211111 | -6.9752778 | 390 | 3358 |
| Lislea | city | County Monaghan | Ireland | 54.1127778 | -7.2530556 | 282 | 2872 |
| Lisnadarragh | city | County Monaghan | Ireland | 54.0158333 | -6.8866667 | 498 | 3121 |
| Lisnagreeve | city | County Monaghan | Ireland | 54.1697222 | -6.7502778 | 495 | 4682 |
| Lisnalee | city | County Monaghan | Ireland | 54.1208333 | -7.2333333 | 426 | 3008 |
| Lisnalong | city | County Monaghan | Ireland | 54.0886111 | -7 | 429 | 3358 |
| Lurganboy | city | County Monaghan | Ireland | 54.1216667 | -7.1941667 | 357 | 3086 |
| Lurganearly | city | County Monaghan | Ireland | 54.1583333 | -6.6388889 | 482 | 6008 |
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