| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Cannonsquarter | city | Carlow | Ireland | 52.81 | -6.78 | 282 | 3981 |
| Cappagh Cross Roads | city | Carlow | Ireland | 52.72 | -6.77 | 344 | 1980 |
| Cappagh House | city | Carlow | Ireland | 52.72 | -6.77 | 354 | 1980 |
| Carlow | city | Carlow | Ireland | 52.84 | -6.93 | 170 | 20008 |
| Carrickslaney | city | Carlow | Ireland | 52.75 | -6.73 | 282 | 2863 |
| Cashel | city | Carlow | Ireland | 52.62 | -6.87 | 324 | 1703 |
| Ceatharlach | city | Carlow | Ireland | 52.84 | -6.93 | 170 | 20008 |
| Chapelstown | city | Carlow | Ireland | 52.83 | -6.90 | 216 | 19622 |
| Clashganna | city | Carlow | Ireland | 52.55 | -6.90 | 249 | 2086 |
| Clashganna Bridge | city | Carlow | Ireland | 52.55 | -6.90 | 249 | 2086 |
| Cloghna | city | Carlow | Ireland | 52.80 | -6.95 | 150 | 10896 |
| Cloghrustick | city | Carlow | Ireland | 52.77 | -6.96 | 137 | 4783 |
| Cloneen Bridge | city | Carlow | Ireland | 52.74 | -6.88 | 830 | 2006 |
| Clonegah | city | Carlow | Ireland | 52.73 | -6.86 | 830 | 1831 |
| Clonegal | city | Carlow | Ireland | 52.69 | -6.65 | 249 | 3082 |
| Clonegall | city | Carlow | Ireland | 52.69 | -6.65 | 249 | 3082 |
| Clongarran | city | Carlow | Ireland | 52.71 | -6.66 | 259 | 1937 |
| Clonmore | city | Carlow | Ireland | 52.82 | -6.57 | 830 | 1733 |
| Clonmullen | city | Carlow | Ireland | 52.65 | -6.68 | 262 | 3069 |
| Closh Cross Roads | city | Carlow | Ireland | 52.73 | -6.74 | 334 | 2134 |
| Closutton | city | Carlow | Ireland | 52.72 | -7.00 | 157 | 4753 |
| Cluain na nGall | city | Carlow | Ireland | 52.69 | -6.65 | 249 | 3082 |
| Coole | city | Carlow | Ireland | 52.87 | -6.66 | 406 | 2196 |
| Coolnamara Cross Roads | city | Carlow | Ireland | 52.55 | -6.91 | 249 | 2322 |
| Coolroe | city | Carlow | Ireland | 52.73 | -6.67 | 393 | 1467 |
| Coonogue | city | Carlow | Ireland | 52.58 | -6.82 | 830 | 1088 |
| Corries Cross Roads | city | Carlow | Ireland | 52.66 | -6.90 | 249 | 1906 |
| Cramlusky | city | Carlow | Ireland | 52.79 | -7.01 | 830 | 2645 |
| Cranaronane | city | Carlow | Ireland | 52.77 | -7.02 | 830 | 1850 |
| Cranemore | city | Carlow | Ireland | 52.67 | -6.73 | 830 | 1447 |
| Crannagh | city | Carlow | Ireland | 52.61 | -6.82 | 830 | 1112 |
| Croneskugh | city | Carlow | Ireland | 52.84 | -6.58 | 830 | 1849 |
| Cuckoo Corner | city | Carlow | Ireland | 52.89 | -6.71 | 377 | 2998 |
| Cunaberry | city | Carlow | Ireland | 52.75 | -6.76 | 291 | 2736 |