| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Callaghs | city | Cavan | Ireland | 54.07 | -7.60 | 249 | 1426 |
| Canningstown | city | Cavan | Ireland | 53.98 | -7.05 | 830 | 1433 |
| Cargagh | city | Cavan | Ireland | 53.95 | -7.26 | 830 | 2172 |
| Cargagh | city | Cavan | Ireland | 53.90 | -7.09 | 830 | 1881 |
| Cargaghoge | city | Cavan | Ireland | 54.00 | -6.89 | 830 | 1867 |
| Carn Cross Roads | city | Cavan | Ireland | 54.08 | -7.55 | 278 | 1727 |
| Carrickallen | city | Cavan | Ireland | 53.99 | -7.14 | 830 | 1494 |
| Carricknashoke | city | Cavan | Ireland | 53.98 | -7.16 | 830 | 1600 |
| Carriga | city | Cavan | Ireland | 53.95 | -7.26 | 830 | 2172 |
| Carrigan | city | Cavan | Ireland | 53.88 | -7.40 | 328 | 2314 |
| Cartronnagilta | city | Cavan | Ireland | 54.11 | -7.77 | 252 | 1049 |
| Cavan | city | Cavan | Ireland | 53.99 | -7.36 | 370 | 9113 |
| Cill na Leice | city | Cavan | Ireland | 53.87 | -7.32 | 830 | 1884 |
| Cill na Sean Ratha | city | Cavan | Ireland | 54.02 | -7.53 | 387 | 1773 |
| Cill na Seanrátha | city | Cavan | Ireland | 54.02 | -7.53 | 387 | 1773 |
| Claragh | city | Cavan | Ireland | 54.09 | -7.28 | 249 | 1819 |
| Clements Town | city | Cavan | Ireland | 54.08 | -7.10 | 255 | 2984 |
| Clifferna | city | Cavan | Ireland | 53.96 | -7.17 | 830 | 1738 |
| Cloghoge | city | Cavan | Ireland | 54.20 | -7.71 | 291 | 1686 |
| Cloverhill | city | Cavan | Ireland | 54.08 | -7.37 | 347 | 1987 |
| Coill Uí Chonáin | city | Cavan | Ireland | 53.96 | -7.27 | 830 | 2656 |
| Coill an Chollaigh | city | Cavan | Ireland | 53.92 | -6.97 | 830 | 3293 |
| Coillidh Chaoin | city | Cavan | Ireland | 54.00 | -7.46 | 393 | 1585 |
| Commons Gate | city | Cavan | Ireland | 54.09 | -7.42 | 374 | 2517 |
| Coollegreane | city | Cavan | Ireland | 54.20 | -8.03 | 209 | 500 |
| Cootehill | city | Cavan | Ireland | 54.07 | -7.08 | 269 | 3100 |
| Coppanagh Mills | city | Cavan | Ireland | 54.09 | -7.20 | 252 | 1277 |
| Coppanaghmore | city | Cavan | Ireland | 54.19 | -7.93 | 830 | 433 |
| Cordingin | city | Cavan | Ireland | 53.98 | -7.19 | 830 | 1703 |
| Corgreagh | city | Cavan | Ireland | 54.03 | -7.15 | 354 | 1263 |
| Corick Bridge | city | Cavan | Ireland | 54.06 | -7.12 | 259 | 2815 |
| Corlea | city | Cavan | Ireland | 54.23 | -7.98 | 377 | 502 |
| Corleckagh | city | Cavan | Ireland | 54.20 | -7.95 | 830 | 452 |
| Corlough | city | Cavan | Ireland | 54.12 | -7.78 | 252 | 903 |
| Cornafean | city | Cavan | Ireland | 53.95 | -7.49 | 252 | 1761 |
| Cornagee | city | Cavan | Ireland | 54.27 | -7.90 | 830 | 1320 |
| Cornagunleog | city | Cavan | Ireland | 54.09 | -7.71 | 246 | 1290 |
| Cornahaw | city | Cavan | Ireland | 54.25 | -7.93 | 830 | 735 |
| Corr na Féinne | city | Cavan | Ireland | 53.95 | -7.49 | 252 | 1761 |
| Corr na Gaoithe | city | Cavan | Ireland | 54.27 | -7.90 | 830 | 1320 |
| Corr na h??ithe | city | Cavan | Ireland | 54.25 | -7.93 | 830 | 735 |
| Corracleigh | city | Cavan | Ireland | 54.18 | -7.86 | 843 | 492 |
| Corraneary | city | Cavan | Ireland | 53.99 | -7.02 | 830 | 1465 |
| Corratirrim | city | Cavan | Ireland | 54.28 | -7.88 | 830 | 1742 |
| Corravilla | city | Cavan | Ireland | 53.97 | -6.95 | 830 | 2678 |
| Corraweelis | city | Cavan | Ireland | 53.96 | -7.30 | 830 | 4255 |
| Corville | city | Cavan | Ireland | 54.10 | -7.65 | 239 | 1510 |
| Croaghan | city | Cavan | Ireland | 54.02 | -7.55 | 416 | 1682 |
| Cronaire | city | Cavan | Ireland | 54.11 | -7.76 | 252 | 1082 |
| Cronery | city | Cavan | Ireland | 54.11 | -7.76 | 252 | 1082 |
| Cros Domhnaigh | city | Cavan | Ireland | 53.95 | -7.43 | 249 | 2688 |
| Cross Forts | city | Cavan | Ireland | 54.03 | -7.33 | 396 | 7547 |
| Cross Keys | city | Cavan | Ireland | 53.92 | -7.27 | 830 | 2138 |
| Crossdoney | city | Cavan | Ireland | 53.95 | -7.43 | 249 | 2688 |
| Crosserlough | city | Cavan | Ireland | 53.88 | -7.28 | 830 | 2242 |
| Crossmakeelan | city | Cavan | Ireland | 53.94 | -6.91 | 830 | 2476 |
| Cullentragh | city | Cavan | Ireland | 54.02 | -7.31 | 830 | 4295 |
| Culliagh | city | Cavan | Ireland | 54.10 | -7.73 | 246 | 1259 |
| Cullies Cross Roads | city | Cavan | Ireland | 54.00 | -6.97 | 830 | 2029 |
| Cúl le Gréin | city | Cavan | Ireland | 54.20 | -8.03 | 209 | 500 |