UpAlphabetical listing of Places in Mayo
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| Coarsepark | city | Mayo | Ireland | 53.87 | -9.31 | 183 | 11773 |
| Cogaula | city | Mayo | Ireland | 53.77 | -9.26 | 170 | 1859 |
| Cogaula | city | Mayo | Ireland | 53.82 | -9.46 | 236 | 3972 |
| Coiladussaun | city | Mayo | Ireland | 54.02 | -9.19 | 78 | 1741 |
| Coillte Mach | city | Mayo | Ireland | 53.85 | -9.00 | 134 | 2702 |
| Coimin na Croise | city | Mayo | Ireland | 54.20 | -10.09 | 3 | 649 |
| Cois Leice | city | Mayo | Ireland | 53.90 | -9.79 | 0 | 368 |
| Conach Réidh | city | Mayo | Ireland | 54.28 | -9.31 | 416 | 848 |
| Conaghra | city | Mayo | Ireland | 54.28 | -9.31 | 416 | 848 |
| Cong | city | Mayo | Ireland | 53.53 | -9.28 | 68 | 870 |
| Conga | city | Mayo | Ireland | 53.53 | -9.28 | 68 | 870 |
| Conrea | city | Mayo | Ireland | 53.83 | -9.54 | 154 | 7078 |
| Contoon | city | Mayo | Ireland | 53.91 | -9.28 | 255 | 7363 |
| Coolaghbaun | city | Mayo | Ireland | 53.78 | -9.06 | 318 | 1524 |
| Coolbarreen | city | Mayo | Ireland | 53.82 | -9.55 | 177 | 7420 |
| Coolcronaun | city | Mayo | Ireland | 54.03 | -9.14 | 134 | 2389 |
| Cooleran | city | Mayo | Ireland | 54.12 | -9.20 | 59 | 8483 |
| Cooley | city | Mayo | Ireland | 53.79 | -9.31 | 193 | 2945 |
| Coollagagh | city | Mayo | Ireland | 53.99 | -9.06 | 242 | 1648 |
| Coolloughra | city | Mayo | Ireland | 53.78 | -9.48 | 216 | 5788 |
| Coolnabinnia | city | Mayo | Ireland | 54.00 | -9.43 | 830 | 405 |
| Coolshinnagh | city | Mayo | Ireland | 53.86 | -9.11 | 272 | 1869 |
| Corclogh | city | Mayo | Ireland | 54.21 | -9.96 | 0 | 1251 |
| Corclogh | city | Mayo | Ireland | 54.25 | -10.04 | 223 | 1102 |
| Corcoranstown | city | Mayo | Ireland | 54.29 | -9.33 | 285 | 528 |
| Corcullin | city | Mayo | Ireland | 54.07 | -9.51 | 249 | 271 |
| Corhoor | city | Mayo | Ireland | 54.29 | -9.38 | 200 | 507 |
| Corimla | city | Mayo | Ireland | 54.12 | -9.08 | 98 | 3111 |
| Corlee | city | Mayo | Ireland | 54.02 | -9.03 | 830 | 1087 |
| Corlummin | city | Mayo | Ireland | 53.97 | -9.15 | 72 | 2094 |
| Cornahavoley | city | Mayo | Ireland | 53.78 | -9.17 | 167 | 1690 |
| Cornamarrow | city | Mayo | Ireland | 53.82 | -9.26 | 154 | 9691 |
| Cornamonaster | city | Mayo | Ireland | 53.79 | -9.17 | 193 | 1747 |
| Cornanaff | city | Mayo | Ireland | 53.91 | -9.13 | 177 | 1758 |
| Cornanool | city | Mayo | Ireland | 53.85 | -9.35 | 203 | 6982 |
| Cornaveagh | city | Mayo | Ireland | 53.80 | -9.32 | 193 | 5493 |
| Corr Ráithe | city | Mayo | Ireland | 54.07 | -9.18 | 68 | 6572 |
| Corrabaun | city | Mayo | Ireland | 53.78 | -9.22 | 154 | 1481 |
| Corradrishy | city | Mayo | Ireland | 54.02 | -9.10 | 157 | 1626 |
| Corratanvally | city | Mayo | Ireland | 53.84 | -9.22 | 137 | 3099 |
| Corratowick | city | Mayo | Ireland | 53.82 | -9.51 | 249 | 7808 |
| Corraun | city | Mayo | Ireland | 53.87 | -9.93 | 3 | 400 |
| Corraun | city | Mayo | Ireland | 53.90 | -9.16 | 160 | 1747 |
| Corraun | city | Mayo | Ireland | 53.72 | -8.77 | 239 | 2809 |
| Corroy | city | Mayo | Ireland | 54.07 | -9.18 | 68 | 6572 |
| Corry | city | Mayo | Ireland | 54.07 | -9.18 | 68 | 6572 |
| Corskeagh | city | Mayo | Ireland | 53.76 | -9.09 | 830 | 1550 |
| Corvickremon | city | Mayo | Ireland | 53.77 | -9.18 | 164 | 1571 |
| Corvoley | city | Mayo | Ireland | 54.18 | -9.41 | 275 | 428 |
| Cottage | city | Mayo | Ireland | 53.84 | -9.25 | 144 | 8762 |
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