| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Claggan | city | Mayo | Ireland | 53.97 | -9.84 | 3 | 294 |
| Claggan | city | Mayo | Ireland | 53.84 | -9.61 | 3 | 806 |
| Claggarnagh | city | Mayo | Ireland | 53.82 | -9.38 | 275 | 1896 |
| Claggarnagh East | city | Mayo | Ireland | 53.93 | -9.48 | 183 | 888 |
| Claggarnagh West | city | Mayo | Ireland | 53.93 | -9.48 | 183 | 888 |
| Claremorris | city | Mayo | Ireland | 53.72 | -9.00 | 239 | 4251 |
| Clerhaun | city | Mayo | Ireland | 53.79 | -9.54 | 246 | 7398 |
| Cloghan | city | Mayo | Ireland | 53.79 | -9.55 | 187 | 7398 |
| Cloghanlucas North | city | Mayo | Ireland | 53.77 | -9.19 | 157 | 1494 |
| Cloghannageeragh | city | Mayo | Ireland | 53.78 | -9.20 | 154 | 1495 |
| Cloghans | city | Mayo | Ireland | 54.06 | -9.21 | 68 | 2058 |
| Cloghboley | city | Mayo | Ireland | 53.86 | -9.17 | 180 | 2161 |
| Cloghbrack | city | Mayo | Ireland | 54.24 | -9.81 | 288 | 960 |
| Cloghbrack | city | Mayo | Ireland | 54.00 | -9.33 | 242 | 769 |
| Clogher | city | Mayo | Ireland | 53.75 | -9.23 | 160 | 1452 |
| Clogher | city | Mayo | Ireland | 54.13 | -10.09 | 0 | 667 |
| Clogher | city | Mayo | Ireland | 53.84 | -9.47 | 206 | 3718 |
| Clogherowan | city | Mayo | Ireland | 53.82 | -9.23 | 144 | 3751 |
| Cloghmore | city | Mayo | Ireland | 53.87 | -9.95 | 0 | 399 |
| Clonnagh | city | Mayo | Ireland | 53.84 | -9.31 | 167 | 12708 |
| Cloonachoor | city | Mayo | Ireland | 54.16 | -9.29 | 137 | 1298 |
| Cloonagh | city | Mayo | Ireland | 53.77 | -9.58 | 282 | 3530 |
| Cloonaghboy | city | Mayo | Ireland | 53.95 | -8.89 | 278 | 2439 |
| Cloonaghduff | city | Mayo | Ireland | 53.80 | -9.25 | 160 | 3247 |
| Cloonaghmore | city | Mayo | Ireland | 53.83 | -9.25 | 144 | 9539 |
| Cloonaghmore | city | Mayo | Ireland | 54.18 | -9.33 | 173 | 963 |
| Cloonaghmore | city | Mayo | Ireland | 53.79 | -9.32 | 196 | 5493 |
| Cloonagleragh | city | Mayo | Ireland | 53.90 | -9.22 | 121 | 2013 |
| Cloonan | city | Mayo | Ireland | 53.82 | -9.41 | 229 | 1690 |
| Cloonarannana Bridge | city | Mayo | Ireland | 53.97 | -8.93 | 190 | 2963 |
| Clooncanavan | city | Mayo | Ireland | 53.84 | -9.46 | 193 | 2965 |
| Cloonconlan | city | Mayo | Ireland | 53.92 | -9.15 | 137 | 1723 |
| Cloonconra | city | Mayo | Ireland | 53.93 | -9.11 | 118 | 1949 |
| Cloonconragh | city | Mayo | Ireland | 53.79 | -9.25 | 160 | 2505 |
| Clooncrooeel | city | Mayo | Ireland | 53.78 | -9.31 | 196 | 2235 |
| Clooncullenbaun | city | Mayo | Ireland | 53.93 | -9.15 | 118 | 1746 |
| Cloondacon | city | Mayo | Ireland | 53.77 | -9.44 | 308 | 1687 |
| Cloondaff | city | Mayo | Ireland | 53.94 | -9.44 | 157 | 608 |
| Cloondeash | city | Mayo | Ireland | 53.82 | -9.32 | 183 | 10972 |
| Cloonduff | city | Mayo | Ireland | 53.94 | -9.44 | 157 | 608 |
| Clooneen | city | Mayo | Ireland | 54.26 | -10.01 | 177 | 1585 |
| Clooneen | city | Mayo | Ireland | 53.79 | -9.56 | 134 | 6916 |
| Clooneen | city | Mayo | Ireland | 53.84 | -9.54 | 114 | 4998 |
| Clooneshil | city | Mayo | Ireland | 53.88 | -9.51 | 170 | 1576 |
| Cloonfadda | city | Mayo | Ireland | 54.18 | -9.25 | 98 | 1676 |
| Cloonfert | city | Mayo | Ireland | 53.81 | -9.33 | 200 | 8385 |
| Cloonfinish | city | Mayo | Ireland | 53.99 | -8.88 | 190 | 1680 |
| Cloonfinnaun | city | Mayo | Ireland | 53.95 | -8.98 | 157 | 2871 |
| Cloonflyn | city | Mayo | Ireland | 53.77 | -9.18 | 160 | 1571 |
| Cloonfohler | city | Mayo | Ireland | 53.91 | -9.55 | 160 | 1209 |
| Cloongowla | city | Mayo | Ireland | 53.63 | -9.20 | 157 | 2972 |
| Cloongullaun | city | Mayo | Ireland | 53.96 | -8.99 | 141 | 2586 |
| Cloonkeen | city | Mayo | Ireland | 53.82 | -9.56 | 22 | 6017 |
| Cloonkeen | city | Mayo | Ireland | 53.82 | -9.36 | 229 | 2787 |
| Cloonkesh | city | Mayo | Ireland | 53.89 | -9.24 | 131 | 3244 |
| Cloonlara | city | Mayo | Ireland | 53.95 | -8.92 | 249 | 3087 |
| Cloonlarhan | city | Mayo | Ireland | 54.01 | -8.66 | 298 | 1145 |
| Cloonlaur | city | Mayo | Ireland | 53.72 | -9.89 | 229 | 517 |
| Cloonlavis | city | Mayo | Ireland | 53.80 | -8.97 | 259 | 2301 |
| Cloonmeen West | city | Mayo | Ireland | 53.96 | -8.75 | 830 | 1596 |
| Cloonmonad | city | Mayo | Ireland | 53.80 | -9.54 | 298 | 7776 |
| Cloonmore | city | Mayo | Ireland | 53.98 | -8.72 | 314 | 1511 |
| Cloonmore Cross Roads | city | Mayo | Ireland | 53.98 | -8.72 | 314 | 1511 |
| Cloonmung | city | Mayo | Ireland | 53.95 | -9.06 | 114 | 1739 |
| Cloonshinnagh | city | Mayo | Ireland | 53.81 | -9.32 | 187 | 9945 |
| Cloonslaun | city | Mayo | Ireland | 54.09 | -9.11 | 127 | 8742 |
| Cloonsunna | city | Mayo | Ireland | 53.82 | -9.31 | 177 | 10861 |
| Cloonta | city | Mayo | Ireland | 54.13 | -9.05 | 160 | 2013 |
| Cloontakilla | city | Mayo | Ireland | 54.16 | -9.75 | 291 | 471 |
| Cloontia | city | Mayo | Ireland | 53.98 | -8.62 | 357 | 1195 |
| Cloontubbrid | city | Mayo | Ireland | 53.91 | -9.22 | 124 | 1722 |
| Cloontybaunan | city | Mayo | Ireland | 53.86 | -9.25 | 137 | 8836 |
| Cloonvoragh | city | Mayo | Ireland | 54.12 | -9.41 | 219 | 870 |
| Clossaghroe | city | Mayo | Ireland | 53.99 | -9.14 | 62 | 2140 |
| Cluain Cearbán | city | Mayo | Ireland | 53.77 | -9.82 | 36 | 734 |
| Cluain Damh | city | Mayo | Ireland | 53.94 | -9.44 | 157 | 608 |
| Cluain Easlán | city | Mayo | Ireland | 54.09 | -9.11 | 127 | 8742 |
| Cluain Fada | city | Mayo | Ireland | 54.18 | -9.25 | 98 | 1676 |
| Cluain Finnis | city | Mayo | Ireland | 53.99 | -8.88 | 190 | 1680 |
| Cluain Fionnáin | city | Mayo | Ireland | 53.95 | -8.98 | 157 | 2871 |
| Cluain Mín Thiar | city | Mayo | Ireland | 53.96 | -8.75 | 830 | 1596 |
| Cluain Mór | city | Mayo | Ireland | 53.98 | -8.72 | 314 | 1511 |
| Cluddaun | city | Mayo | Ireland | 54.21 | -9.51 | 830 | 168 |
| Clár Chlainne Mhuiris | city | Mayo | Ireland | 53.72 | -9.00 | 239 | 4251 |
| Clár Clainne Mhuiris | city | Mayo | Ireland | 53.72 | -9.00 | 239 | 4251 |