| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Iascaigh | city | Sligeach | Ireland | 54.2886111 | -8.9616667 | 3 | 1913 |
| Idle Corner | city | County Offaly | Ireland | 53.2108333 | -7.6508333 | 262 | 2658 |
| Ightermurragh | city | Corcaigh | Ireland | 51.8961111 | -8.0183333 | 62 | 4749 |
| Illanbaun | city | Sligeach | Ireland | 54.2055556 | -8.5663889 | 249 | 2372 |
| Illaunbaun | city | An Clar | Ireland | 52.8666667 | -9.3152778 | 508 | 2503 |
| Illies | city | County Donegal | Ireland | 55.1483333 | -7.3319444 | 492 | 2297 |
| Imleach | city | Tiobraid Arann | Ireland | 52.4638889 | -8.3491667 | 344 | 4196 |
| Imlick | city | County Donegal | Ireland | 54.9713889 | -7.4163889 | 9 | 11802 |
| Inagh | city | An Clar | Ireland | 52.875 | -9.1816667 | 226 | 2510 |
| Inbhear | city | County Donegal | Ireland | 54.6519444 | -8.2833333 | 3 | 1641 |
| Inch | city | Ciarrai | Ireland | 52.1497222 | -9.9680556 | 114 | 1417 |
| Inch | city | Corcaigh | Ireland | 51.8058333 | -8.1825 | 13 | 3228 |
| Inch | city | Tiobraid Arann | Ireland | 52.6880556 | -8.0963889 | 974 | 2850 |
| Inch | city | Corcaigh | Ireland | 51.9863889 | -7.9797222 | 249 | 5162 |
| Inch | city | County Donegal | Ireland | 55.0702778 | -7.4805556 | 3 | 1626 |
| Inch | city | Loch Garman | Ireland | 52.7388889 | -6.2344444 | 173 | 3872 |
| Inch Bridge | city | Ciarrai | Ireland | 52.4675 | -9.5352778 | 219 | 2405 |
| Inch Cross Roads | city | Laois | Ireland | 53.0388889 | -7.1208333 | 288 | 3487 |
| Inchacooly | city | Laois | Ireland | 53.1652778 | -7.0977778 | 239 | 4070 |
| Inchamay | city | | Ireland | 52.05 | -8.8833333 | 997 | 5192 |
| Inchamore | city | Gaillimh | Ireland | 53.0427778 | -8.6494444 | 446 | 2789 |
| Inchanisky | city | Laois | Ireland | 53.0572222 | -7.5511111 | 767 | 2766 |
| Inchantatane | city | Corcaigh | Ireland | 52.2341667 | -9.1008333 | 826 | 5174 |
| Inchaquire | city | Cill Dara | Ireland | 53.0275 | -6.7994444 | 492 | 6922 |
| Inchec Bridge | city | Ciarrai | Ireland | 51.9105556 | -9.3391667 | 869 | 2693 |
| Inches | city | Corcaigh | Ireland | 52.0794444 | -9.1755556 | 452 | 4227 |
| Inchibeg | city | | Ireland | 52.0833333 | -9.1833333 | 462 | 4227 |
| Inchibeg Bridge | city | | Ireland | 52.0833333 | -9.1833333 | 462 | 4227 |
| Inchicore | city | Baile Atha Cliath | Ireland | 53.3377778 | -6.3461111 | 101 | 102936 |
| Inchicorrigane | city | Ciarrai | Ireland | 52.1202778 | -9.3938889 | 580 | 2426 |
| Inchigeelagh | city | Corcaigh | Ireland | 51.8333333 | -9.1166667 | 505 | 5223 |
| Inchileigh Bridge | city | Corcaigh | Ireland | 52.0594444 | -9.0727778 | 501 | 5190 |
| Inchinalee | city | Ros Comain | Ireland | 53.3444444 | -7.9669444 | 190 | 2145 |
| Inchinalyra | city | County Limerick | Ireland | 52.3588889 | -9.3322222 | 272 | 3744 |
| Inchinglanna | city | Ciarrai | Ireland | 51.9391667 | -9.7636111 | 1381 | 2436 |
| Inchinossig Bridge | city | Corcaigh | Ireland | 51.8583333 | -9.24 | 492 | 5192 |
| Inchintaglin Bridge | city | Corcaigh | Ireland | 51.7133333 | -9.72 | 308 | 3584 |
| Inchisine | city | Corcaigh | Ireland | 51.8697222 | -9.0238889 | 396 | 5219 |
| Inckaroe Cross Roads | city | County Offaly | Ireland | 53.1130556 | -7.6788889 | 515 | 2669 |
| Indreabhan | city | Gaillimh | Ireland | 53.2422222 | -9.4291667 | 3 | 1344 |
| Indreabhán | city | Gaillimh | Ireland | 53.2422222 | -9.4291667 | 3 | 1344 |
| Inga | city | Gaillimh | Ireland | 53.1755556 | -8.2644444 | 354 | 2884 |
| Inis | city | An Clar | Ireland | 52.8436111 | -8.9863889 | 49 | 2510 |
| Inis Caoin | city | County Monaghan | Ireland | 54 | -6.5833333 | 190 | 8264 |
| Inis Cein | city | Corcaigh | Ireland | 51.7416667 | -8.9380556 | 236 | 5233 |
| Inis Corthaidh | city | Loch Garman | Ireland | 52.5008333 | -6.5577778 | 196 | 4033 |
| Inis Crabhann | city | Sligeach | Ireland | 54.2166667 | -9.1 | 13 | 1168 |
| Inis Céin | city | Corcaigh | Ireland | 51.7416667 | -8.9380556 | 236 | 5233 |
| Inis Córthaidh | city | Loch Garman | Ireland | 52.5008333 | -6.5577778 | 196 | 4033 |
| Inis Diomain | city | An Clar | Ireland | 52.9447222 | -9.2922222 | 141 | 2373 |
| Inis Díomáin | city | An Clar | Ireland | 52.9447222 | -9.2922222 | 141 | 2373 |
| Inis Eonain | city | Corcaigh | Ireland | 51.7680556 | -8.6591667 | 232 | 5229 |
| Inis Eonáin | city | Corcaigh | Ireland | 51.7680556 | -8.6591667 | 232 | 5229 |
| Inis Tiog | city | Cill Chainnigh | Ireland | 52.4888889 | -7.0627778 | 108 | 3319 |
| Inis Tíog | city | Cill Chainnigh | Ireland | 52.4888889 | -7.0627778 | 108 | 3319 |
| Inish | city | Loch Garman | Ireland | 52.1905556 | -6.6036111 | 3 | 1975 |
| Inishannon | city | Corcaigh | Ireland | 51.7680556 | -8.6591667 | 232 | 5229 |
| Inishcarra | city | Corcaigh | Ireland | 51.8833333 | -8.6333333 | 223 | 5215 |
| Inishcarra Bridge | city | Corcaigh | Ireland | 51.8902778 | -8.6227778 | 219 | 5215 |
| Inishcrone | city | Sligeach | Ireland | 54.2166667 | -9.1 | 13 | 1168 |
| Inishkeen | city | County Monaghan | Ireland | 54 | -6.5833333 | 190 | 8264 |
| Inishnaneill | city | County Donegal | Ireland | 55.2330556 | -7.2763889 | 236 | 2180 |
| Iniskeen | city | County Monaghan | Ireland | 54 | -6.5833333 | 190 | 8264 |
| Inistioge | city | Cill Chainnigh | Ireland | 52.4888889 | -7.0627778 | 108 | 3319 |
| Innfield | city | An Mhi | Ireland | 53.4183333 | -6.8352778 | 282 | 4974 |
| Innishannon | city | Corcaigh | Ireland | 51.7680556 | -8.6591667 | 232 | 5229 |
| Inniskeen | city | County Monaghan | Ireland | 54 | -6.5833333 | 190 | 8264 |
| Inse | city | Ciarrai | Ireland | 52.1497222 | -9.9680556 | 114 | 1417 |
| Inse Geimhleach | city | Corcaigh | Ireland | 51.8333333 | -9.1166667 | 505 | 5223 |
| Insnasallagh | city | Corcaigh | Ireland | 52.1575 | -8.2761111 | 111 | 5184 |
| Intack | city | Cill Mhantain | Ireland | 53.0269444 | -6.6063889 | 915 | 4571 |
| Inver | city | Maigh Eo | Ireland | 54.245 | -9.8652778 | 95 | 1362 |
| Inver | city | County Donegal | Ireland | 54.6519444 | -8.2833333 | 3 | 1641 |
| Inveran | city | Gaillimh | Ireland | 53.2422222 | -9.4291667 | 3 | 1344 |
| Inverin | city | Gaillimh | Ireland | 53.2422222 | -9.4291667 | 3 | 1344 |
| Irichaboy South | city | Gaillimh | Ireland | 53.0152778 | -8.7727778 | 246 | 2791 |
| Irineragh | city | County Donegal | Ireland | 54.9511111 | -7.6636111 | 91 | 2103 |
| Irishford | city | An Mhi | Ireland | 53.7566667 | -6.6788889 | 285 | 4152 |
| Irishtown | city | Cill Dara | Ireland | 52.9852778 | -6.8869444 | 291 | 7140 |
| Irishtown | city | Baile Atha Cliath | Ireland | 53.3380556 | -6.215 | 0 | 89847 |
| Ironmills Bridge | city | Laois | Ireland | 52.8663889 | -7.2958333 | 492 | 3016 |
| Iry | city | Laois | Ireland | 53.0422222 | -7.4047222 | 436 | 2773 |
| Island | city | Port Lairge | Ireland | 52.1133333 | -7.4869444 | 0 | 1917 |
| Island Bridge | city | Loch Garman | Ireland | 52.6594444 | -6.3813889 | 278 | 4022 |
| Islandbridge | city | Baile Atha Cliath | Ireland | 53.3483333 | -6.3091667 | 29 | 102936 |
| Islandeady | city | | Ireland | 53.8166667 | -9.4 | 285 | 1810 |
| Islandmore | city | County Limerick | Ireland | 52.5102778 | -8.7127778 | 114 | 5475 |
| Islandmore | city | Ros Comain | Ireland | 53.9552778 | -8.5944444 | 498 | 1934 |
| Islands | city | Cill Chainnigh | Ireland | 52.7344444 | -7.5930556 | 472 | 3100 |
| Islands Bridge | city | Tiobraid Arann | Ireland | 52.5483333 | -7.5116667 | 367 | 2874 |
| Islandtarsney | city | Port Lairge | Ireland | 52.155 | -7.2066667 | 177 | 2508 |
|
|