| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Cairlinn | city | Lu | Ireland | 54.04 | -6.19 | 108 | 3269 |
| Canonstown | city | Lu | Ireland | 53.75 | -6.31 | 59 | 20501 |
| Carlingford | city | Lu | Ireland | 54.04 | -6.19 | 108 | 3269 |
| Carnbeg | city | Lu | Ireland | 54.03 | -6.40 | 19 | 29775 |
| Castle Roche Cross Roads | city | Lu | Ireland | 54.05 | -6.49 | 183 | 5379 |
| Castlebellingham | city | Lu | Ireland | 53.90 | -6.39 | 3 | 4415 |
| Ceann Chlochair | city | Lu | Ireland | 53.79 | -6.24 | 0 | 1332 |
| Chanonrock | city | Lu | Ireland | 53.97 | -6.55 | 134 | 3110 |
| Cill Choirle | city | Lu | Ireland | 54.00 | -6.47 | 98 | 10433 |
| Cill Sáráin | city | Lu | Ireland | 53.89 | -6.39 | 3 | 4179 |
| Civil Hollow | city | Lu | Ireland | 53.87 | -6.31 | 32 | 1746 |
| Clogher | city | Lu | Ireland | 53.79 | -6.24 | 0 | 1332 |
| Clogherhead | city | Lu | Ireland | 53.79 | -6.24 | 0 | 1332 |
| Clonmore | city | Lu | Ireland | 53.84 | -6.34 | 157 | 3432 |
| Cloughmore | city | Lu | Ireland | 54.05 | -6.25 | 830 | 2772 |
| Cluain Mhór | city | Lu | Ireland | 53.84 | -6.34 | 157 | 3432 |
| Cobbler's Cross | city | Lu | Ireland | 53.82 | -6.30 | 49 | 2878 |
| Cobbler’s Cross | city | Lu | Ireland | 53.82 | -6.30 | 49 | 2878 |
| Collann | city | Lu | Ireland | 53.78 | -6.49 | 830 | 2258 |
| Collon | city | Lu | Ireland | 53.78 | -6.49 | 830 | 2258 |
| Coratown Cross | city | Lu | Ireland | 53.86 | -6.28 | 3 | 1373 |
| Corcreaghy | city | Lu | Ireland | 53.96 | -6.62 | 193 | 2513 |
| Corcreeghagh | city | Lu | Ireland | 53.96 | -6.62 | 193 | 2513 |
| Cornamucklagh | city | Lu | Ireland | 54.10 | -6.29 | 65 | 7116 |
| Cruisetown | city | Lu | Ireland | 53.82 | -6.27 | 3 | 2403 |
| Currathir Bridge | city | Lu | Ireland | 54.07 | -6.35 | 318 | 5095 |