| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Alder Trees | city | Wexford | Ireland | 52.59 | -6.50 | 209 | 2803 |
| Aldworth's Bridge | city | Cork | Ireland | 52.22 | -9.02 | 830 | 2269 |
| Aldworth’s Bridge | city | Cork | Ireland | 52.22 | -9.02 | 830 | 2269 |
| Alexander Reid | city | Meath | Ireland | 53.65 | -6.63 | 265 | 14939 |
| Alexandra Bridge | city | Kildare | Ireland | 53.29 | -6.68 | 275 | 10320 |
| Alkill | city | Monaghan | Ireland | 54.25 | -6.86 | 236 | 2436 |
| Allagesh | city | Monaghan | Ireland | 54.26 | -7.11 | 255 | 2175 |
| Allaphreaghaun | city | Galway | Ireland | 53.26 | -9.24 | 82 | 1802 |
| Alleeny Bridge | city | Galway | Ireland | 53.03 | -8.39 | 249 | 906 |
| Allen | city | Kildare | Ireland | 53.24 | -6.87 | 830 | 4766 |
| Allen's Bridge | city | Cork | Ireland | 52.19 | -8.97 | 830 | 3244 |
| Allenwood | city | Kildare | Ireland | 53.29 | -6.89 | 262 | 3154 |
| Allenwood Cross Roads | city | Kildare | Ireland | 53.29 | -6.83 | 285 | 4340 |
| Allen’s Bridge | city | Cork | Ireland | 52.19 | -8.97 | 830 | 3244 |
| Allerstown | city | Meath | Ireland | 53.63 | -6.74 | 213 | 7295 |
| Alliconaun | city | Mayo | Ireland | 54.21 | -9.96 | 3 | 1425 |
| Allihies | city | Cork | Ireland | 51.63 | -10.03 | 830 | 716 |
| Alloon Lower | city | Galway | Ireland | 53.39 | -8.48 | 249 | 1437 |
| Allt an Chaorthainn | city | Leitrim | Ireland | 54.12 | -7.91 | 915 | 444 |
| Allt an Ghabhlán | city | Roscommon | Ireland | 54.11 | -8.15 | 830 | 922 |
| Allt na Péiste | city | Donegal | Ireland | 54.81 | -7.90 | 269 | 1117 |
| Almaseed Bridge | city | Ireland | 52.29 | -8.17 | 830 | 2036 | |
| Alt | city | Donegal | Ireland | 54.77 | -7.59 | 387 | 2683 |
| Alt Lower | city | Donegal | Ireland | 54.77 | -7.58 | 377 | 2796 |
| Alt Upper | city | Donegal | Ireland | 54.77 | -7.59 | 387 | 2683 |
| Altadoo | city | Donegal | Ireland | 54.68 | -8.17 | 282 | 2335 |
| Altadush | city | Donegal | Ireland | 54.93 | -7.95 | 830 | 392 |
| Altagowlan | city | Roscommon | Ireland | 54.11 | -8.15 | 830 | 922 |
| Altahalla | city | Donegal | Ireland | 55.25 | -7.41 | 259 | 2156 |
| Altakeeran | city | Leitrim | Ireland | 54.12 | -7.91 | 915 | 444 |
| Altans | city | Sligo | Ireland | 54.24 | -8.85 | 246 | 769 |
| Altateskin | city | Cavan | Ireland | 54.15 | -7.78 | 830 | 661 |
| Altbaun | city | Mayo | Ireland | 53.87 | -9.05 | 830 | 2170 |
| Altderg | city | Mayo | Ireland | 54.03 | -9.97 | 3 | 619 |
| Altnabrocky | city | Mayo | Ireland | 54.08 | -9.57 | 255 | 140 |
| Altnagapple | city | Donegal | Ireland | 54.73 | -8.38 | 830 | 1182 |
| Altnapaste | city | Donegal | Ireland | 54.81 | -7.90 | 269 | 1117 |
| Altshallan | city | Cavan | Ireland | 54.18 | -7.93 | 931 | 377 |