| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Carraig Álainn | city | Leitrim | Ireland | 53.98 | -7.65 | 249 | 1314 |
| Carrick on Shannon | city | Leitrim | Ireland | 53.95 | -8.09 | 246 | 3656 |
| Carrick-on-Shannon | city | Leitrim | Ireland | 53.95 | -8.09 | 246 | 3656 |
| Carrigallen | city | Leitrim | Ireland | 53.98 | -7.65 | 249 | 1314 |
| Castlecarra | city | Leitrim | Ireland | 53.95 | -8.06 | 239 | 3769 |
| Castlefore | city | Leitrim | Ireland | 54.03 | -7.91 | 160 | 1169 |
| Ceathrú Mhic Oireacht | city | Leitrim | Ireland | 54.26 | -8.16 | 830 | 1239 |
| Ceis Charraigín | city | Leitrim | Ireland | 54.02 | -7.94 | 183 | 1076 |
| Cill Fhearga | city | Leitrim | Ireland | 54.23 | -8.21 | 278 | 888 |
| Cill Tachúrc | city | Leitrim | Ireland | 53.98 | -8.04 | 328 | 3256 |
| Cill an Iomaire | city | Leitrim | Ireland | 54.21 | -8.29 | 246 | 1389 |
| Cionn Locha | city | Leitrim | Ireland | 54.45 | -8.28 | 144 | 3037 |
| Claonachadh | city | Leitrim | Ireland | 54.06 | -7.78 | 249 | 1730 |
| Cleenaghoo | city | Leitrim | Ireland | 54.06 | -7.78 | 249 | 1730 |
| Cloghermeen | city | Leitrim | Ireland | 54.37 | -8.19 | 990 | 756 |
| Cloghmeen | city | Leitrim | Ireland | 54.37 | -8.19 | 990 | 756 |
| Cloonaquin | city | Leitrim | Ireland | 54.28 | -8.21 | 206 | 1421 |
| Cloonboygher | city | Leitrim | Ireland | 54.03 | -7.70 | 252 | 1198 |
| Clooncose | city | Leitrim | Ireland | 54.03 | -7.67 | 252 | 1151 |
| Cloone | city | Leitrim | Ireland | 53.95 | -7.78 | 239 | 1155 |
| Cloontyprughlish | city | Leitrim | Ireland | 54.38 | -8.32 | 830 | 604 |
| Cluain Buíochair | city | Leitrim | Ireland | 54.03 | -7.70 | 252 | 1198 |
| Cluain Cuas | city | Leitrim | Ireland | 54.03 | -7.67 | 252 | 1151 |
| Cluain Mhic Cuinn | city | Leitrim | Ireland | 54.28 | -8.21 | 206 | 1421 |
| Cluainín | city | Leitrim | Ireland | 54.31 | -8.18 | 229 | 1793 |
| Cnoc an Chuilinn | city | Leitrim | Ireland | 54.21 | -8.16 | 282 | 755 |
| Coill an Bhogaigh | city | Leitrim | Ireland | 54.19 | -8.23 | 830 | 921 |
| Coill an Ghairr | city | Leitrim | Ireland | 54.02 | -7.62 | 249 | 1130 |
| Coill na Madadh Rua | city | Leitrim | Ireland | 54.09 | -7.83 | 354 | 1532 |
| Coillte Bardáin | city | Leitrim | Ireland | 54.06 | -7.87 | 285 | 1528 |
| Coillte Clochair | city | Leitrim | Ireland | 54.35 | -8.03 | 249 | 1356 |
| Cora Droma Rúisc | city | Leitrim | Ireland | 53.95 | -8.09 | 246 | 3656 |
| Coraidh Eolais | city | Leitrim | Ireland | 53.95 | -8.09 | 249 | 3544 |
| Corchuill | city | Leitrim | Ireland | 54.19 | -8.12 | 324 | 685 |
| Corderry Cross Roads | city | Leitrim | Ireland | 53.99 | -7.95 | 180 | 1168 |
| Corglass | city | Leitrim | Ireland | 54.12 | -8.08 | 190 | 732 |
| Corlea | city | Leitrim | Ireland | 53.96 | -7.94 | 830 | 1282 |
| Corlisheen | city | Leitrim | Ireland | 53.97 | -7.99 | 246 | 1461 |
| Cornageeha | city | Leitrim | Ireland | 53.88 | -7.77 | 236 | 1314 |
| Cornageeragh | city | Leitrim | Ireland | 54.08 | -7.81 | 252 | 1739 |
| Cornamucklagh South | city | Leitrim | Ireland | 54.12 | -8.02 | 830 | 461 |
| Corr an Liatháin | city | Leitrim | Ireland | 54.11 | -7.80 | 262 | 1168 |
| Corr an Liobair | city | Leitrim | Ireland | 54.17 | -7.97 | 1082 | 449 |
| Corr an Mhailín | city | Leitrim | Ireland | 54.01 | -7.71 | 265 | 1228 |
| Corr na Muclach Theas | city | Leitrim | Ireland | 54.12 | -8.02 | 830 | 461 |
| Corr na gCaorach | city | Leitrim | Ireland | 54.08 | -7.81 | 252 | 1739 |
| Corractoona | city | Leitrim | Ireland | 54.34 | -7.99 | 246 | 1460 |
| Corraleehan | city | Leitrim | Ireland | 54.11 | -7.80 | 262 | 1168 |
| Corraneary | city | Leitrim | Ireland | 53.96 | -7.72 | 830 | 1294 |
| Corratimore | city | Leitrim | Ireland | 54.20 | -8.20 | 830 | 823 |
| Corrawaleen | city | Leitrim | Ireland | 54.01 | -7.71 | 265 | 1228 |
| Corrawalleen | city | Leitrim | Ireland | 54.01 | -7.71 | 265 | 1228 |
| Corrawallen | city | Leitrim | Ireland | 54.01 | -7.71 | 265 | 1228 |
| Corriga | city | Leitrim | Ireland | 53.93 | -7.68 | 236 | 1436 |
| Corrigo | city | Leitrim | Ireland | 53.93 | -7.68 | 236 | 1436 |
| Corry | city | Leitrim | Ireland | 54.17 | -8.06 | 190 | 622 |
| Corryolus | city | Leitrim | Ireland | 53.95 | -8.09 | 249 | 3544 |
| Cortober | city | Leitrim | Ireland | 54.17 | -7.97 | 1082 | 449 |
| Cromlin | city | Leitrim | Ireland | 54.08 | -7.83 | 311 | 1464 |
| Cuilmore | city | Leitrim | Ireland | 54.04 | -7.75 | 249 | 1375 |
| Currach na Báine | city | Leitrim | Ireland | 54.10 | -7.86 | 830 | 873 |
| Curraghnabania | city | Leitrim | Ireland | 54.10 | -7.86 | 830 | 873 |
| Curraghs North | city | Leitrim | Ireland | 54.14 | -8.12 | 190 | 753 |
| Curraun | city | Leitrim | Ireland | 53.95 | -7.84 | 830 | 2062 |