| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Lackan | city | County Donegal | Ireland | 54.6402778 | -8.055 | 249 | 2297 |
| Lackcrom | city | County Donegal | Ireland | 54.7033333 | -8.1177778 | 643 | 2245 |
| Laconnell | city | County Donegal | Ireland | 54.7602778 | -8.4997222 | 629 | 1830 |
| Lagacurry | city | County Donegal | Ireland | 55.31 | -7.3397222 | 170 | 1426 |
| Laghy | city | County Donegal | Ireland | 54.6166667 | -8.1 | 150 | 2133 |
| Lagnadaraugh | city | County Donegal | Ireland | 55.0508333 | -7.3866667 | 6 | 4964 |
| Laheen | city | County Donegal | Ireland | 54.5377778 | -8.1388889 | 1053 | 2332 |
| Larganreagh | city | County Donegal | Ireland | 55.1991667 | -7.83 | 104 | 1501 |
| Largy | city | County Donegal | Ireland | 54.6294444 | -8.5127778 | 0 | 1709 |
| Leaght | city | County Donegal | Ireland | 54.8161111 | -7.6475 | 209 | 2316 |
| Leahgarrow | city | County Donegal | Ireland | 54.9902778 | -8.5025 | 160 | 464 |
| Legland | city | County Donegal | Ireland | 54.8727778 | -7.7680556 | 387 | 2314 |
| Legnahoory | city | County Donegal | Ireland | 55.036111 | -7.8047222 | 360 | 2304 |
| Lehardan | city | County Donegal | Ireland | 55.1430556 | -7.5644444 | 246 | 1401 |
| Leifear | city | County Donegal | Ireland | 54.8319444 | -7.4836111 | 42 | 3175 |
| Leitir Ceanainn | city | County Donegal | Ireland | 54.95 | -7.7333333 | 173 | 2310 |
| Leitir Mhic an Bhaird | city | County Donegal | Ireland | 54.8480556 | -8.3163889 | 134 | 2194 |
| Lemacraig | city | County Donegal | Ireland | 54.5691667 | -7.8552778 | 393 | 2057 |
| Lenamore | city | County Donegal | Ireland | 55.0544444 | -7.3133333 | 13 | 10103 |
| Lenan | city | County Donegal | Ireland | 55.2505556 | -7.5158333 | 347 | 845 |
| Lenankeel | city | County Donegal | Ireland | 55.2405556 | -7.5161111 | 564 | 1256 |
| Lergynasearhagh | city | County Donegal | Ireland | 54.7241667 | -8.5641667 | 508 | 2064 |
| Leslie Hill | city | County Donegal | Ireland | 54.9358333 | -7.6263889 | 203 | 2103 |
| Letterbarra | city | County Donegal | Ireland | 54.6905556 | -8.1816667 | 246 | 2150 |
| Lettergull | city | County Donegal | Ireland | 54.8958333 | -7.5275 | 45 | 2319 |
| Letterkenny | city | County Donegal | Ireland | 54.95 | -7.7333333 | 173 | 2310 |
| Letterkilley | city | County Donegal | Ireland | 54.7944444 | -7.9963889 | 695 | 2315 |
| Letterleague | city | County Donegal | Ireland | 54.9202778 | -7.7822222 | 465 | 2310 |
| Lettermacaward | city | County Donegal | Ireland | 54.8480556 | -8.3163889 | 134 | 2194 |
| Lettermakenny | city | County Donegal | Ireland | 54.8283333 | -7.7872222 | 1440 | 2315 |
| Lettermore | city | County Donegal | Ireland | 54.7116667 | -8.2422222 | 209 | 2321 |
| Lifford | city | County Donegal | Ireland | 54.8319444 | -7.4836111 | 42 | 3175 |
| Limestone Brook Bridge | city | County Donegal | Ireland | 54.6852778 | -8.0708333 | 167 | 2315 |
| Linsfort | city | County Donegal | Ireland | 55.1719444 | -7.4972222 | 95 | 1831 |
| Lisavaddy | city | County Donegal | Ireland | 54.6563889 | -8.3522222 | 213 | 1617 |
| Lisclamer | city | County Donegal | Ireland | 54.925 | -7.6097222 | 344 | 2110 |
| Liscooly | city | County Donegal | Ireland | 54.7994444 | -7.6427778 | 150 | 2316 |
| Liscooly Bridge | city | County Donegal | Ireland | 54.7966667 | -7.6422222 | 150 | 2316 |
| Lismoghry | city | County Donegal | Ireland | 54.9377778 | -7.5511111 | 472 | 2246 |
| Listack | city | County Donegal | Ireland | 54.9105556 | -7.7705556 | 498 | 2311 |
| Listicall | city | County Donegal | Ireland | 54.9680556 | -7.4752778 | 193 | 2300 |
| Loch an Iuir | city | County Donegal | Ireland | 54.9972222 | -8.2908333 | 6 | 2307 |
| Loch an Iúir | city | County Donegal | Ireland | 54.9972222 | -8.2908333 | 6 | 2307 |
| Losset | city | County Donegal | Ireland | 55.0316667 | -7.8827778 | 531 | 2304 |
| Lough Nakey | city | County Donegal | Ireland | 55.0708333 | -7.6861111 | 209 | 2208 |
| Loughanure | city | County Donegal | Ireland | 54.9972222 | -8.2908333 | 6 | 2307 |
| Lougheraherk | city | County Donegal | Ireland | 54.7438889 | -8.6377778 | 1440 | 1955 |
| Loughfad Hill | city | County Donegal | Ireland | 54.8158333 | -8.4066667 | 6 | 1977 |
| Loughros | city | County Donegal | Ireland | 55.0730556 | -7.6716667 | 249 | 2208 |
| Lubber | city | County Donegal | Ireland | 54.9705556 | -7.7063889 | 236 | 2161 |
| Luddan | city | County Donegal | Ireland | 55.1161111 | -7.4511111 | 488 | 1934 |
| Lurganboy | city | County Donegal | Ireland | 55.1233333 | -7.5883333 | 360 | 1940 |
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