# List of islands of Ireland

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This is a list of islands of Ireland. Ireland is itself an island, lying west of the island of Great Britain and northwest of mainland Europe.
The Hebrides off Scotland and Anglesey off Wales were grouped with Ireland ("Hibernia") by the Greco-Roman geographer Ptolemy, but this was not geographically correct and is purely of historical interest.

## Largest offshore islands by area and population

| English name | County | Area Hectares (Acres) | Population 2022 | Area Rank | Population Rank | Causeway/Bridge |
| Great Island | Cork | 2,475 (6,115) | >13000 | 4 | 1 | Yes |
| Achill Island | Mayo | 14,279 (35,283) | 2345 | 1 | 2 | yes |
| Gorumna | Galway | 2,376 (5,871) | 1044 | 5 | 3 | Yes |
| Inishmore | Galway | 3,090 (7,635) | 820 | 2 | 4 | No |
| Valentia Island or Valencia Island | Kerry | 2,578 (6,371) | 658 | 3 | 5 | yes |
| Lettermore | Galway | 912 (2,254) | 542 | 12 | 6 | Yes |
| Arranmore or Aran Island | Donegal | 1,754 (4,335) | 478 | 7 | 7 | No |
| Inch Island | Donegal | 1,386 (3,425) | 396 | 10 | 8 | Yes |
| Inisheer or Inishere | Galway | 570 (1,400) | 343 | 17 | 9 | No |
| Bere Island or Bear Island | Cork | 1,769 (4,372) | 218 | 6 | 10 | No |
| Lettermullen or Lettermullan | Galway | 318 (787) | 214 | 25 | 11 | Yes |
| Inishmaan | Galway | 948 (2,342) | 184 | 13 | 12 | No |
| Inishbofin | Galway | 1,275 (3,151) | 184 | 11 | 12 | No |
| Rathlin Island | Antrim | 1,437 (3,552) | 141 | 9 | c.22 | No |
| Clare Island | Mayo | 1,640 (4,053) | 138 | 8 | | No |
| Myross Island | Cork | 96 (238) | 31 | | | No |

## Total population of Irish offshore islands

The number of people living on Irish offshore islands decreased dramatically during the Irish famine and the period following it. Since then the trend on most islands has been a decreasing population until the 1950s and 1960s, during which many islands were forcibly evacuated by the Irish Government as continuous bad weather meant that islanders were unable to travel to the mainland for several consecutive months. Of the remaining islands that were not evacuated, many of their populations have continued to dwindle ever since, with some seeing stabilisation or even a slight uptick in population during and after the Celtic Tiger.
The chart below shows the total number of people living on Irish islands throughout the years.
| Year | Pop. | ±% |
| 1841 | 34,219 | — |
| 1851 | 29,314 | −14.3% |
| 1861 | 27,948 | −4.7% |
| 1871 | 26,571 | −4.9% |
| 1881 | 29,226 | +10.0% |
| 1891 | 26,149 | −10.5% |
| 1901 | 25,446 | −2.7% |
| 1911 | 24,700 | −2.9% |
| 1926 | 21,662 | −12.3% |
| Year | Pop. | ±% |
| 1936 | 19,926 | −8.0% |
| 1946 | 18,665 | −6.3% |
| 1951 | 17,488 | −6.3% |
| 1956 | 16,118 | −7.8% |
| 1961 | 14,473 | −10.2% |
| 1966 | 12,899 | −10.9% |
| 1971 | 11,737 | −9.0% |
| 1979 | 10,866 | −7.4% |
| 1981 | 10,869 | +0.0% |
| Year | Pop. | ±% |
| 1986 | 10,409 | −4.2% |
| 1991 | 9,569 | −8.1% |
| 1996 | 9,280 | −3.0% |
| 2002 | 8,884 | −4.3% |
| 2006 | 8,983 | +1.1% |
| 2011 | 9,087 | +1.2% |
| 2016 | 8,756 | −3.6% |
| 2022 | 8,931 | +2.0% |
Source: Central Statistics Office. "CNA17: Population by Off Shore Island, Sex and Year". CSO.ie. Retrieved 12 October 2016. :

## Full table

| English name | Irish name | County | Group/Location | Area Acres | Height Metres | Population 1841 | Population 2022 | Connection to mainland | Coordinates | OS grid | PDI ref |
| Rathlin Island | Reachlainn | Antrim | North Channel | 3552 | 134 | 1010 | 141 | Passenger ferry from Ballycastle | 55°17′32″N 6°11′30″W﻿ / ﻿55.29222°N 6.19167°W﻿ / 55.29222; -6.19167﻿ (Rathlin Island) | D1452 | 61298 |
| The Maidens or Hulin Rocks | Na Maighdeanacha | Antrim | North Channel | | | | 0 | None | 54°55.7′N 5°43.6′W﻿ / ﻿54.9283°N 5.7267°W﻿ / 54.9283; -5.7267 | D4612 | 1166440 |
| Angus Rock | | Down | Strangford Lough | 0.4 | 2 | 0 | 0 | | 54°19′51″N 5°31′34″W﻿ / ﻿54.33083°N 5.52611°W﻿ / 54.33083; -5.52611﻿ (Angus Rock) | J6145 | — |
| Copeland Island | Oileán Chóplainn | Down | North Channel | 295 | 33 | 31 | | | 54°40′29″N 5°31′44″W﻿ / ﻿54.67472°N 5.52889°W﻿ / 54.67472; -5.52889﻿ (Copeland Island) | J6083 | 1166534 |
| Cannon Rock | | Down | North Channel | | | | | | 54°24′28.7″N 5°21′59.6″W﻿ / ﻿54.407972°N 5.366556°W﻿ / 54.407972; -5.366556﻿ ("South Rock lightbuoy, near Cannon Rock") | J676531 | — |
| Mid Island | | Down | Strangford Lough | 15 | | 7 | | | | J566672 | 65848 |
| Rough Island | | Down | Strangford Lough | 7 | 13 | 4 | | Causeway accessible at low tide | | J494689 | 66037 |
| Reagh Island | | Down | Strangford Lough | 128 | 19 | 14 | | Road | | J525650 | 66111 |
| Mahee Island | Inis Mochaoi | Down | Strangford Lough | 177 | 27 | 28 | | Road via Reagh Island | | J532640 | 66110 |
| Wood Island | | Down | Strangford Lough | 23 | 8 | 4 | | | | J510642 | 66116 |
| Rainey Island | | Down | Strangford Lough | 40 | | 10 | | | | J528631 | 65894 |
| Sketrick Island | | Down | Strangford Lough | 41 | | 11 | | Road | | J526625 | 65898 |
| Trasnagh Island | | Down | Strangford Lough | 25 | | 13 | | | | J536620 | 65899 |
| Roe Island | | Down | Strangford Lough | 21 | | 7 | | | | J542610 | 65896 |
| Conley Island or Conly Island | | Down | Strangford Lough | 65 | | 23 | | | | J529609 | 66233 |
| Dunsy Island | | Down | Strangford Lough | 33 | 24 | 6 | | | | J543590 | 66236 |
| Islandmore | | Down | Strangford Lough | 122 | 18 | 18 | | | | J541581 | 66241 |
| Pawle Island | | Down | Strangford Lough | 50 | | 12 | | | | J543573 | 66271 |
| Simmy Island | | Down | Strangford Lough | 8 | | 3 | | | | J531557 | 66274 |
| Island Taggart | | Down | Strangford Lough | 77 | | 15 | | | | J533547 | 66266 |
| Castle Island | | Down | Strangford Lough | 113 | 37 | 68 | | Road | | J511488 | 66882 |
| Gores Island or Gore's Island | | Down | Strangford Lough | 99 | 30 | 18 | | | | J521494 | 66883 |
| Salt Island | | Down | Strangford Lough | 51 | 16 | 2 | | | | J530502 | 66895 |
| Rockabill | Cloch Dábhiolla | Dublin | Irish Sea | | | 0 | 0 | | 53°36′N 6°0′W﻿ / ﻿53.600°N 6.000°W﻿ / 53.600; -6.000﻿ (Rockabill) | O321627 | 1165790 |
| Colt Island | Inis Coilt | Dublin | Skerries | 7 | 13 | 0 | 0 | | 53°35′N 6°5′W﻿ / ﻿53.583°N 6.083°W﻿ / 53.583; -6.083﻿ (Colt Island) | O265612 | 17032 |
| St Patrick's Island | Inis Pádraig | Dublin | Skerries | 15 | 12 | 0 | 0 | | 53°35′7″N 6°4′26″W﻿ / ﻿53.58528°N 6.07389°W﻿ / 53.58528; -6.07389﻿ (St Patrick's Island) | O275612 | 17034 |
| Shenick Island or Shenick's Island | Oileán Sionnaigh | Dublin | Skerries | 15 | 8 | 4 | 0 | | 53°34′20″N 6°5′1″W﻿ / ﻿53.57222°N 6.08361°W﻿ / 53.57222; -6.08361﻿ (Shenick Island) | O268598 | 17033 |
| Lambay Island | Reachrainn | Dublin | Irish Sea | 595 | 126 (Knockbane, and Tinian Hill) | 89 | 16 | | 53°29′30″N 6°1′0″W﻿ / ﻿53.49167°N 6.01667°W﻿ / 53.49167; -6.01667﻿ (Lambay Island) | O3151 | 1166603 Archived 14 June 2012 at the Wayback Machine |
| Ireland's Eye | Inis Mac Neasáin | Dublin | Irish Sea | 53 | 69 | 0 | 0 | | 53°24′19″N 6°3′49″W﻿ / ﻿53.40528°N 6.06361°W﻿ / 53.40528; -6.06361﻿ (Ireland's Eye) | O2941 | 1166256 |
| Bull Island or North Bull | Oileán an Bhulla | Dublin | Dublin Bay | c.740 | 4 | 12 | 14 | Road causeways | 53°22′1″N 6°8′55″W﻿ / ﻿53.36694°N 6.14861°W﻿ / 53.36694; -6.14861﻿ (Bull Island) | O2337 | 57172 |
| Dalkey Island | Oileán Dheilginse | Dublin | Irish Sea | 21 | 90 | 8 | 0 | | 53°16′N 6°5′W﻿ / ﻿53.267°N 6.083°W﻿ / 53.267; -6.083﻿ (Dalkey Island) | O278263 | 16606 |
| Kerragh Island | | Wexford | Saint George's Channel | | | | | | 52°11′42″N 6°43′54″W﻿ / ﻿52.19500°N 6.73167°W﻿ / 52.19500; -6.73167﻿ (Kerragh Islands) | | |
| Begerin Island or Beggerin Island | Beigéirinn | Wexford | North Slob | 22 | 5 | 20 | 0 | Road (no longer an island) | | T082251 | 53675 |
| Tuskar Rock | an Tuscar | Wexford | Saint George's Channel | | | 4 | 0 | | 52°12′10″N 6°12′26″W﻿ / ﻿52.20278°N 6.20722°W﻿ / 52.20278; -6.20722﻿ (Tuskar Rock) | T2207 | 1166860 |
| Saltee Island Great | An Sailte Mór | Wexford | Saltee Islands | 216 | 58 | 0 | 0 | | 52°7′N 6°36′W﻿ / ﻿52.117°N 6.600°W﻿ / 52.117; -6.600﻿ (Saltee Island Great) | X9597 | 1166651 |
| Bannow Island | Oileán Bhanú | Wexford | Bannow Bay | 144 | 81 | 24 | 0 | Road (no longer an island) | | S819078 | 53760 |
| Fota Island or Foaty | Fóite | Cork | Cork Harbour | 767 | 30 | 209 | | Rail and road bridges (no longer an island) | 51°53′57″N 8°17′53″W﻿ / ﻿51.89917°N 8.29806°W﻿ / 51.89917; -8.29806﻿ (Fota Island) | W7072 | 1166136 |
| Great Island | an tOileán Mór | Cork | Cork Harbour | 6115 | 91 | 9424 | >12000 | Rail and road bridges via Fota I; car ferry to Passage West | 51°52′N 8°17′W﻿ / ﻿51.867°N 8.283°W﻿ / 51.867; -8.283﻿ (Great Island) | W8069 | 1166543 |
| Rocky Island | an tOileán Carraigeach | Cork | Cork Harbour | 3 | | 3 | | Road bridge | 51°50′N 8°18′W﻿ / ﻿51.833°N 8.300°W﻿ / 51.833; -8.300﻿ (Rocky Island) | W792649 | 9407 |
| Haulbowline Island | Inis Sionnach | Cork | Cork Harbour | 86 | 20 | 222 | 148 | Road bridge via Rocky Island | 51°50′30″N 8°18′0″W﻿ / ﻿51.84167°N 8.30000°W﻿ / 51.84167; -8.30000﻿ (Haulbowline Island) | W792654 | 1410428 |
| Spike Island | Inis Píc | Cork | Cork Harbour | 98 | 24 | 202 | 0 | | 51°50′N 8°17′W﻿ / ﻿51.833°N 8.283°W﻿ / 51.833; -8.283﻿ (Spike Island) | W8065 | 1166269 |
| Inchydoney | Oileán Inse Duine | Cork | Clonakilty Harbour | 475 | 63 | 235 | 247 | Road causeways (no longer an island) | 51°36′7″N 8°52′34″W﻿ / ﻿51.60194°N 8.87611°W﻿ / 51.60194; -8.87611﻿ (Inchydoney) | W4039 | 1166540 |
| Rabbit Island | Oileán Bhríde | Cork | Squince Harbour | 18 | 19 | 17 | 0 | None | | W221315 | 13263 |
| Fastnet Rock | Carraig Aonair | Cork | Atlantic Ocean | | 24 | 0 | 0 | | 51°23′3″N 9°36′1″W﻿ / ﻿51.38417°N 9.60028°W﻿ / 51.38417; -9.60028﻿ (Fastnet Rock) | V8816 | 1165639 |
| Cape Clear Island | Cléire | Cork | Carbery Islands | 1502 | 160 (Killickaforavane) | 1052 | 110 | Passenger ferries (Baltimore; Schull, seasonal) | 51°26′N 9°30′W﻿ / ﻿51.433°N 9.500°W﻿ / 51.433; -9.500﻿ (Clear Island) | V9521 | 543 |
| Sherkin Island | Inis Arcáin | Cork | Carbery Islands | 1248 | 101 (Slievemore) | 1131 | 110 | Passenger ferry from Baltimore | 51°28′N 9°25′W﻿ / ﻿51.467°N 9.417°W﻿ / 51.467; -9.417﻿ (Sherkin Island) | W0225 | 13016 |
| Spanish Island | | Cork | Carbery Islands | 134 | 34 | 26 | 0 | None | | W033275 | 13005 |
| Ringarogy Island | Rinn Ghearróige | Cork | Carbery Islands | 951 | 44 | 597 | 88 | Road bridge | | W0528 | 1166618 |
| Inishbeg | Inis Beag | Cork | Carbery Islands | 370 | 37 | 335 | 23 | Road bridge | | W0631 | 13298 |
| Mannin Island | Manainn | Cork | Roaringwater Bay | 14 | 18 | 4 | 0 | None | | W016325 | 13298 |
| Heir Island, Hare Island, or Inishodriscol | Inis Uí Drisceoil | Cork | Carbery Islands | 380 | 26 | 358 | 29 | Passenger ferry (Baltimore–Schull; seasonal) | 51°29′29″N 9°26′47″W﻿ / ﻿51.49139°N 9.44639°W﻿ / 51.49139; -9.44639﻿ (Heir Island) | V9928 | 129542 |
| Calf Islands | Na Laonna | Cork | Carbery Islands | 77 (East) 62 (Middle) 63 (West) | 22 (East) 14 (Middle) 28 (West) | 19 (East) 39 (Middle) 21 (West) | 0 | | | V9626 | 1166289 |
| Skeam East | Inis Céime Thoir | Cork | Carbery Islands | 50 | 19 | 29 | 0 | None | | W0029 | 12938 |
| Skeam West | Inis Céime Thiar | Cork | Carbery Islands | 31 | 17 | 22 | 0 | None | | V987288 | 12939 |
| Horse Island | Oileán an Chapaill | Cork | Carbery Islands | 154 | 39 | 137 | 1 | | | V980301 | 13378 |
| Castle Island | Oileán an Chaisleáin | Cork | Carbery Islands | 122 | 36 | 92 | 0 | | | V957294 | 13369 |
| Long Island | Inis Fada | Cork | Carbery Islands | 341 | 31 | 336 | 17 | | | V9228 | 13528 |
| Whiddy Island | Faoide | Cork | Bantry Bay | 1001 | 50 | 729 | 31 | Seasonal passenger ferry to Bantry | 51°42′N 9°30′W﻿ / ﻿51.700°N 9.500°W﻿ / 51.700; -9.500﻿ (Whiddy Island) | V9650 | 8648 |
| Chapel Island | | Cork | Bantry Bay | 16 | 22 | 4 | | | 51°42′N 9°30′W﻿ / ﻿51.700°N 9.500°W﻿ / 51.700; -9.500﻿ (Chapel Island) | V982498 | 8636 |
| Ilnacullin, Garinish, or Garnish | Garinis | Cork | Bantry Bay | 36 | 34 | 13 | 0 | | 51°44′11″N 9°32′28″W﻿ / ﻿51.73639°N 9.54111°W﻿ / 51.73639; -9.54111﻿ (Ilnacullin) | V934548 | 8530 |
| Roancarrigmore | Róncharraig Mhór | Cork | Bantry Bay | 3 | 6 | 0 | 0 | | 51°39′10″N 9°44′50″W﻿ / ﻿51.65278°N 9.74722°W﻿ / 51.65278; -9.74722﻿ (Roancarrigmore) | V791460 | 8731 |
| Dinish Island | Duínis | Cork | Bantry Bay | 45 | 40 | 13 | 0 | Road bridge | | V684455 | 8805 |
| Bere Island or Bear Island | an tOileán Mór | Cork | Bantry Bay | 4372 | 273 (Knockanallig) | 2108 | 187 | Car ferries from Castletownbere and Beal Lough | 51°38′N 9°53′W﻿ / ﻿51.633°N 9.883°W﻿ / 51.633; -9.883﻿ (Bere Island) | V7044 | 1166542 |
| Dursey Island | Oileán Baoi | Cork | Atlantic Ocean | 1403 | 252 | 198 | 3 | aerial tramway | 51°36′N 10°12′W﻿ / ﻿51.600°N 10.200°W﻿ / 51.600; -10.200﻿ (Dursey Island) | V4841 | 8835 |
| Inishfarnard | Inis Fearn Ard | Cork | Coulagh Bay | 64 | 44 | 30 | 0 | | 51°42′38.4″N 10°1′32.2″W﻿ / ﻿51.710667°N 10.025611°W﻿ / 51.710667; -10.025611﻿ (Inishfarnard) | V604528 | 8787 |
| Ormond's Island | Oileán Urumhan | Kerry | Kenmare River | 20 | 10 | 0 | | Causeway at low tide | 51°49′35″N 09°44′52″W﻿ / ﻿51.82639°N 9.74778°W﻿ / 51.82639; -9.74778﻿ (Ormonds Island) | V792653 | 22944 |
| Dinish Island | Duínis | Kerry | Kenmare River | 25 | 11 | 11 | 0 | | 51°50′50″N 09°39′12″W﻿ / ﻿51.84722°N 9.65333°W﻿ / 51.84722; -9.65333﻿ (Dinish Island) | V859673 | 22930 |
| Dunkerron Island East | Oileán Dhún Ciaráin Thoir | Kerry | Kenmare River | 22 | 5 | 15 | 0 | None | | V876692 | 23121 |
| Dunkerron Island West | Oileán Dhún Ciaráin Thiar | Kerry | Kenmare River | 30 | 5 | 15 | 0 | None | | V869691 | 23122 |
| Cappanacush Island | Oileán an Tí | Kerry | Kenmare River | 19 | 11 | 8 | 0 | None | | V854690 | 22947 |
| Garinish Island | Garinis | Kerry | Kenmare River | 57 | | | | None | 51°48′17″N 09°53′57″W﻿ / ﻿51.80472°N 9.89917°W﻿ / 51.80472; -9.89917﻿ (Garinish Island) | V6892763122 | 22889 |
| Greenane Islands | Oileáin an Ghrianáin | Kerry | Kenmare River | 22 | 5 | 6 | 0 | None | | V853692 | 23022 |
| Rossmore Island | an Ros Mór | Kerry | Kenmare River | 319 | 32 | 0 | 15 | Road bridge | 51°49′35″N 09°48′12″W﻿ / ﻿51.82639°N 9.80333°W﻿ / 51.82639; -9.80333﻿ (Rossmore Island) | V758651 | 23166 |
| Rossdohan Island | Oileán Ros Dochan | Kerry | Kenmare River | 134 | 35 | | 0 | Road bridge | 51°48′10″N 09°51′55″W﻿ / ﻿51.80278°N 9.86528°W﻿ / 51.80278; -9.86528﻿ (Rossdohan Island) | V712627 | 23165 |
| Sherky Island | Oileán Seirce | Kerry | Kenmare River | 82 | 36 | 9 | 0 | None | 51°47′24″N 09°53′58″W﻿ / ﻿51.79000°N 9.89944°W﻿ / 51.79000; -9.89944﻿ (Sherky Island) | V686612 | 22909 |
| Deenish Island | Duínis | Kerry | Atlantic Ocean | 122 | 144 | 0 | 0 | | 51°44′13″N 10°13′09″W﻿ / ﻿51.73694°N 10.21917°W﻿ / 51.73694; -10.21917﻿ (Deenish Island) | V466560 | 22214 |
| Scariff Island | an Scairbh | Kerry | Atlantic Ocean | 366 | 252 | 0 | 0 | | 51°43′47″N 10°14′53″W﻿ / ﻿51.72972°N 10.24806°W﻿ / 51.72972; -10.24806﻿ (Scariff Island) | V445555 | 22224 |
| Puffin Island | Oileán na gCánóg | Kerry | Atlantic Ocean | 125 | 159 | 0 | 0 | | 51°50′N 10°25′W﻿ / ﻿51.833°N 10.417°W﻿ / 51.833; -10.417﻿ (Puffin Island) | V3468 | 1166547 |
| Little Skellig or Skellig Rock Little | Sceilg Beag | Kerry | Skellig Islands | 17 | 134 | 0 | 0 | | 51°46′N 10°32′W﻿ / ﻿51.767°N 10.533°W﻿ / 51.767; -10.533﻿ (Little Skellig) | V270618 | 22406 |
| Skellig Michael or Skellig Rock Great | Sceilg Mhichíl | Kerry | Skellig Islands | 44 | 186 | 0 | 0 | | 51°46′N 10°32′W﻿ / ﻿51.767°N 10.533°W﻿ / 51.767; -10.533﻿ (Skellig Michael) | V2561 | 22405 |
| Valentia Island or Valencia Island | Dairbhre | Kerry | Atlantic Ocean | 6371 | 266 (Geokaun) | 2886 | 658 | Road bridge, and ferry | 51°54′N 10°21′W﻿ / ﻿51.900°N 10.350°W﻿ / 51.900; -10.350﻿ (Valentia Island) | V3876 | 22439 |
| Beginish Island | Beag Inis | Kerry | Valentia Harbour | 159 | 63 | | 0 | Ferry | 51°56′N 10°18′W﻿ / ﻿51.93°N 10.30°W﻿ / 51.93; -10.30﻿ (Beginish Island) | | 22439 |
| Church Island | Oileán an Teampaill | Kerry | Valentia Harbour | 1 | 4 | 0 | 0 | | 51°56′13″N 10°16′59″W﻿ / ﻿51.937°N 10.283°W﻿ / 51.937; -10.283﻿ (Church Island) | | 101097 |
| Lamb Island | Oileán na nUan | Kerry | Valentia Harbour | 5 | 23 | 0 | 0 | | 51°56′N 10°17′W﻿ / ﻿51.94°N 10.29°W﻿ / 51.94; -10.29﻿ (Lamb Island) | | 22156 |
| Beginish | Beiginis | Kerry | Blasket Islands | 32 | 14 | 84 | 0 | | 52°6′56″N 10°30′26″W﻿ / ﻿52.11556°N 10.50722°W﻿ / 52.11556; -10.50722﻿ (Beginish) | V263988 | 22146 |
| Great Blasket Island | an Blascaod Mór | Kerry | Blasket Islands | 1060 | 292 (Croaghmore) | 153 | 0 | | 52°6′N 10°32′W﻿ / ﻿52.100°N 10.533°W﻿ / 52.100; -10.533﻿ (Great Blasket Island) | V259963 | 22578 |
| Inishnabro | Inis na Bró | Kerry | Blasket Islands | 102 | 175 | 0 | 0 | | 52°3′28″N 10°36′32″W﻿ / ﻿52.05778°N 10.60889°W﻿ / 52.05778; -10.60889﻿ (Inishnabro) | V2193 | 22580 |
| Inishvickillane | Inis Mhic Aoibhleáin | Kerry | Blasket Islands | 171 | 135 | 3 | 0 | | 52°2′37″N 10°36′30″W﻿ / ﻿52.04361°N 10.60833°W﻿ / 52.04361; -10.60833﻿ (Inishvickillane) | V2191 | 22582 |
| Tearaght Island | an Tiaracht | Kerry | Blasket Islands | 47 | 183 | 0 | 0 | | 52°4′36″N 10°39′30″W﻿ / ﻿52.07667°N 10.65833°W﻿ / 52.07667; -10.65833﻿ (Tearaght Island) | V179948 | 22583 |
| Inishtooskert | Inis Tuaisceart | Kerry | Blasket Islands | 186 | 172 | 0 | 0 | | 52°7′50″N 10°34′42″W﻿ / ﻿52.13056°N 10.57833°W﻿ / 52.13056; -10.57833﻿ (Inishtooskert) | Q2301 | 22581 |
| Magharee Islands or the Seven Hogs | Oileáin an Mhachaire | Kerry | Atlantic Ocean | 32 (Illauntannig), 29 (Illaunimmil), 13 (Inishtooshkert), 9 (Gurrig), 6 (Reennafardarrig), 5 (Illaunboe) | 23 (Gurrig), 16 (Inishtooshkert), 12 (Illaunboe), 15 (Reennafardarrig), 15 (Illauntannig), 22 (Illaunimmil) | 0 | 0 | | 52°19′N 10°2′W﻿ / ﻿52.317°N 10.033°W﻿ / 52.317; -10.033﻿ (Magharee Islands) | Q6022 | 1166527 |
| Fenit Island | an Fhianait | Kerry | Tralee Bay | 439 | 12 | 315 | | Track (tombolo) | 52°17′N 9°52′W﻿ / ﻿52.283°N 9.867°W﻿ / 52.283; -9.867﻿ (Fenit Island) | Q720174 | 24367 |
| Carrig Island | Oileán na Carraige | Kerry | Shannon Estuary | 231 | 6 | 105 | 4 | Road bridge | 52°37′17.59″N 9°4′15.74″W﻿ / ﻿52.6215528°N 9.0710389°W﻿ / 52.6215528; -9.0710389 | Q985481 | 23885 |
| Tarbert Island | Oileán Thairbirt | Kerry | Shannon Estuary | 63 | 20 | 134 | 2 | Roads (no longer an island) | 52°34′21″N 9°22′30″W﻿ / ﻿52.57250°N 9.37500°W﻿ / 52.57250; -9.37500﻿ (Tarbert Island) | R075494 | 24189 |
| Foynes Island | Oileán Fainge | Limerick | Shannon Estuary | 294 | 60 | 83 | 3 | | 52°37′21.8″N 9°6′45.1″W﻿ / ﻿52.622722°N 9.112528°W﻿ / 52.622722; -9.112528 | R2553 | 1166539 Archived 7 August 2012 at the Wayback Machine |
| Aughinish | Eachinis | Limerick | Shannon Estuary | 1066 | 21 | 140 | | Road bridges | 52°37′17.59″N 9°4′15.74″W﻿ / ﻿52.6215528°N 9.0710389°W﻿ / 52.6215528; -9.0710389 | R2853 | 1166075 |
| Green Island | Oileán Uí Uainín | Clare | Shannon Estuary | 15 | 7 | 9 | 0 | | 52°40′56.85″N 8°55′13.63″W﻿ / ﻿52.6824583°N 8.9204528°W﻿ / 52.6824583; -8.9204528 | R457591 | 7410 |
| Dernish Island | | Clare | Shannon Estuary | 8 | 14 | 11 | | Road (no longer an island) | 52°40′56.85″N 8°55′13.63″W﻿ / ﻿52.6824583°N 8.9204528°W﻿ / 52.6824583; -8.9204528 | R378595 | 104097 |
| Inishmacnaghtan | Inis Mhic Neachtain | Clare | Fergus Estuary | 285 | 24 | 12 | | Road | 52°42′28″N 8°57′2.65″W﻿ / ﻿52.70778°N 8.9507361°W﻿ / 52.70778; -8.9507361 | R359623 | 6141 |
| Feenish | Fínis | Clare | Fergus Estuary | 177 | 31 | 19 | | | 52°42′21.64″N 8°58′21.75″W﻿ / ﻿52.7060111°N 8.9727083°W﻿ / 52.7060111; -8.9727083 | R343620 | 6139 |
| Deenish Island | | Clare | Fergus Estuary | 44 | 28 | 13 | | | 52°42′59.83″N 8°57′53.94″W﻿ / ﻿52.7166194°N 8.9649833°W﻿ / 52.7166194; -8.9649833 | R351631 | 6153 |
| Horse Island | | Clare | Fergus Estuary | 34 | 8 | 13 | | | 52°44′47.04″N 9°1′47.54″W﻿ / ﻿52.7464000°N 9.0298722°W﻿ / 52.7464000; -9.0298722 | R301667 | 7021 |
| Inishmore or Deer Island | Inis Mór | Clare | Fergus Estuary | 444 | 36 | 133 | 0 | None | 52°42′51.13″N 9°2′4.73″W﻿ / ﻿52.7142028°N 9.0346472°W﻿ / 52.7142028; -9.0346472 | R300630 | 6879 |
| Coney Island | Oileán na gCoiníní | Clare | Fergus Estuary | 245 | 44 | 145 | 0 | None | 52°42′38.03″N 9°0′28.32″W﻿ / ﻿52.7105639°N 9.0078667°W﻿ / 52.7105639; -9.0078667 | R321626 | 6923 |
| Inishmacowney | Inis Mhic Uaithne | Clare | Fergus Estuary | 225 | ≥20 | 142 | 0 | None | 52°41′2.66″N 9°2′53.57″W﻿ / ﻿52.6840722°N 9.0482139°W﻿ / 52.6840722; -9.0482139 | R290596 | 6929 |
| Canon Island | Oileán na gCanánach | Clare | Shannon Estuary | 271 | 28 | 54 | 0 | | 52°40′N 9°23′W﻿ / ﻿52.667°N 9.383°W﻿ / 52.667; -9.383﻿ (Canon Island) | R2959 | 1166545 |
| Inishloe | Inis Lua | Clare | Shannon Estuary | 131 | 13 | 114 | 0 | | 52°40′38.17″N 9°1′14.67″W﻿ / ﻿52.6772694°N 9.0207417°W﻿ / 52.6772694; -9.0207417 | R310588 | 6969 |
| Inishtubbrid | Inis Tiobrad | Clare | Shannon Estuary | 85 | 33 | 0 | 0 | None | 52°40′8.05″N 9°3′57.53″W﻿ / ﻿52.6689028°N 9.0659806°W﻿ / 52.6689028; -9.0659806 | R279579 | 6971 |
| Inishcorker | Inis Corcair | Clare | Shannon Estuary | 207 | 31 | 7 | 0 | Road bridge | 52°40′38.17″N 9°1′14.67″W﻿ / ﻿52.6772694°N 9.0207417°W﻿ / 52.6772694; -9.0207417 | R264579 | 6968 |
| Inishbig, or Hog Island | | Clare | Shannon Estuary | 43 | 14 | 8 | | | 52°37′13.59″N 9°30′0.4″W﻿ / ﻿52.6204417°N 9.500111°W﻿ / 52.6204417; -9.500111 | Q9752 | 7205 |
| Scattery Island | Inis Cathaigh | Clare | Shannon Estuary | 179 | 14 | 65 | 0 | | 52°37′21.8″N 9°6′45.1″W﻿ / ﻿52.622722°N 9.112528°W﻿ / 52.622722; -9.112528 | Q9752 | 7214 |
| Mutton Island | Oileán Caorach | Clare | Atlantic Ocean | 159 | 28 | 0 | 0 | None | 52°48′45.11″N 9°31′26.76″W﻿ / ﻿52.8125306°N 9.5241000°W﻿ / 52.8125306; -9.5241000 | Q9775 | 1166533 |
| Aughinish | Eachinis | Clare | Galway Bay | 369 | 23 | 342 | 52 | Road (tombolo) | 53°5′24″N 9°2′24″W﻿ / ﻿53.09000°N 9.04000°W﻿ / 53.09000; -9.04000﻿ (Aughinish) | M2813 | 1166074 |
| Inisheer or Inishere | Inis Oírr | Galway | Aran Islands | 1400 | 57 | 456 | 343 | Air from Inverin; passenger ferries from Rossaveal, and seasonally from Galway and Roadford near Doolin | 53°3′29″N 9°31′39″W﻿ / ﻿53.05806°N 9.52750°W﻿ / 53.05806; -9.52750﻿ (Inisheer) | L9802 | 18684 |
| Inishmaan | Inis Meáin | Galway | Aran Islands | 2252 | 79 | 473 | 184 | Air from Inverin; passenger ferries from Rossaveal, and seasonally from Galway and Roadford near Doolin | 53°5′N 9°35′W﻿ / ﻿53.083°N 9.583°W﻿ / 53.083; -9.583﻿ (Inishmaan) | L9405 | 937 |
| Inishmore | Árainn | Galway | Aran Islands | 7635 | 123 | 2592 | 820 | Air from Inverin; passenger ferries from Rossaveal, and seasonally from Galway and Roadford near Doolin | 53°7′25″N 9°43′39″W﻿ / ﻿53.12361°N 9.72750°W﻿ / 53.12361; -9.72750﻿ (Inishmore) | L8509 | 938 |
| Brannock Island East | Árainn | Galway | Aran Islands | | | | | | 53°8′14.66″N 9°49′49.49″W﻿ / ﻿53.1374056°N 9.8304139°W﻿ / 53.1374056; -9.8304139 | | |
| Brannock Island Middle | Árainn | Galway | Aran Islands | | | | | | 53°8′26.3″N 9°50′29.97″W﻿ / ﻿53.140639°N 9.8416583°W﻿ / 53.140639; -9.8416583 | | |
| Brannock Island South | Árainn | Galway | Aran Islands | | | | | | 53°8′29.45″N 9°50′53.76″W﻿ / ﻿53.1415139°N 9.8482667°W﻿ / 53.1415139; -9.8482667 | | |
| Brannock Island | Árainn | Galway | Aran Islands | | | | | | 53°8′40.57″N 9°50′23.48″W﻿ / ﻿53.1446028°N 9.8398556°W﻿ / 53.1446028; -9.8398556 | | |
| Rock Island | Árainn | Galway | Aran Islands | | | | | | 53°8′50.39″N 9°51′26.83″W﻿ / ﻿53.1473306°N 9.8574528°W﻿ / 53.1473306; -9.8574528 | | |
| Island Eddy | Oileán Eide | Galway | Galway Bay | 138 | 8 | 125 | 2 | None | 53°12′N 8°59′W﻿ / ﻿53.200°N 8.983°W﻿ / 53.200; -8.983﻿ (Island Eddy) | M339164 | 18613 |
| Tawin East | Tamhain Thoir | Galway | Galway Bay | <179 | | ≤193 | | Road | 53°13′10.43″N 9°0′52.29″W﻿ / ﻿53.2195639°N 9.0145250°W﻿ / 53.2195639; -9.0145250 | M3219 | 1166796 |
| Tawin Island | Tamhain | Galway | Galway Bay | >218 | 6 | ≥108 | | Road via Tawin East | 53°13′7.89″N 9°2′12.57″W﻿ / ﻿53.2188583°N 9.0368250°W﻿ / 53.2188583; -9.0368250 | M3119 | 18504 |
| Rossroe Island | An Ros | Galway | Greatman's Bay | 58 | 14 | 7 | 12 | Road bridge | 53°17′11.83″N 9°36′18.28″W﻿ / ﻿53.2866194°N 9.6050778°W﻿ / 53.2866194; -9.6050778 | L928275 | 20704 |
| Inchamakinna | Inis Mhic Cionaith | Galway | Greatman's Bay | 109 | 18 | 41 | 0 | None | | L920267 | 20702 |
| Annaghvaan | Eanach Mheáin | Galway | Gorumna group | 311 | 15 | 125 | 140 | Road bridge | 53°18′51.17″N 9°38′26.2″W﻿ / ﻿53.3142139°N 9.640611°W﻿ / 53.3142139; -9.640611 | L9131 | 20803 |
| Inishlusk | Inis Loiscthe | Galway | Gorumna group | 13 | 8 | 24 | | | | L898303 | 20814 |
| Lettermore | Leitir Móir | Galway | Gorumna group | 2254 | 117 | 844 | 542 | Road bridge via Annaghvaan | 53°17′51.72″N 9°40′4.46″W﻿ / ﻿53.2977000°N 9.6679056°W﻿ / 53.2977000; -9.6679056 | L8829 | 20818 |
| Gorumna | Garmna | Galway | Gorumna group | 5871 | 53 | 1910 | 1044 | Road bridge via Lettermore | 53°15′0″N 9°40′48″W﻿ / ﻿53.25000°N 9.68000°W﻿ / 53.25000; -9.68000﻿ (Gorumna) | L8824 | 1166158 |
| Lettermullen or Lettermullan | Leitir Mealláin | Galway | Gorumna group | 787 | 45 | 587 | 214 | Road bridge via Gorumna | 53°14′38″N 9°43′34″W﻿ / ﻿53.24389°N 9.72611°W﻿ / 53.24389; -9.72611﻿ (Lettermullen) | L8423 | 20728 |
| Crappagh Island | an Cnapach | Galway | Gorumna group | 118 | 16 | 53 | 0 | Road bridge via Lettermullen | 53°14′31.31″N 9°45′4.91″W﻿ / ﻿53.2420306°N 9.7513639°W﻿ / 53.2420306; -9.7513639 | L8323 | 20720 |
| Furnace Island | Fornais | Galway | Gorumna group | 219 | 27 | 155 | 66 | Road bridge via Lettermullen | 53°15′18.27″N 9°44′32.47″W﻿ / ﻿53.2550750°N 9.7423528°W﻿ / 53.2550750; -9.7423528 | L8424 | 20724 |
| Inisherk | Inis Eirc | Galway | Gorumna group | 64 | 27 | 49 | 0 | | 53°14′58.12″N 9°45′10.17″W﻿ / ﻿53.2494778°N 9.7528250°W﻿ / 53.2494778; -9.7528250 | L829235 | 20727 |
| Dinish Island | Daighinis | Galway | Gorumna group | 95 | 19 | 59 | 0 | | 53°15′44.52″N 9°45′14.18″W﻿ / ﻿53.2623667°N 9.7539389°W﻿ / 53.2623667; -9.7539389 | L828250 | 20721 |
| Inishbarra | Inis Bearachain | Galway | Gorumna group | 262 | 37 | 205 | 0 | | | L8627 | 20813 |
| Illauneeragh | an tOileán Iatharach | Galway | Gorumna group | 90 | 21 | 15 | 0 | | | L842270 | 20809 |
| Inishtravin | Inis Treabhair | Galway | Kilkieran Bay | 190 | 14 | 93 | 0 | None | | L885311 | 18158 |
| Clynagh Island | Cladhnach | Galway | Camus Bay | 103 | 15 | 0 | 0 | None | | L953272 | 20706 |
| Inisheltia | Inis Aillte | Galway | Camus Bay | 67 | 12 | 0 | 0 | None | | L938347 | 20931 |
| Roeillaun | Rua-oileáin | Galway | Kilkieran Bay | 3 | | 17 | 0 | None | | L681591 | 18341 |
| Illaunmore | an tOileán Mór | Galway | Kilkieran Bay | 96 | 14 | 89 | 1 | None | | L897349 | 1398093 |
| Illauneeragh West | an tOileán Iarthach Thiar | Galway | Kilkieran Bay | 78 | 15 | 65 | 0 | | | L886347 | 20928 |
| Finish Island | Fínis | Galway | Maínis Bay | 154 | 8 | 66 | 0 | Tombolo | | L7929 | 1166125 |
| Rusheennacholla | Roisín an Chalaidh | Galway | Maínis Bay | 79 | 10 | 53 | 12 | Road | | L776305 | 18278 |
| Mweenish Island | Maínis | Galway | Maínis Bay | 572 | 23 | 649 | 127 | Road via Rusheennacholla | 53°18′01″N 9°52′35″W﻿ / ﻿53.30028°N 9.87639°W﻿ / 53.30028; -9.87639﻿ (Mweenish Island) | L7629 | 1166448 |
| Masson Island or Mason Island | Oileán Máisean | Galway | Atlantic Ocean | 92 | 14 | 98 | 0 | | | L7429 | 1166541 |
| St Macdara's Island | Cruach na Cara | Galway | Atlantic Ocean | 61 | 27 | 9 | 0 | | | L719302 | 18280 |
| Croaghnakeela Island | Cruach na Caoile | Galway | Atlantic Ocean | 141 | 63 | 0 | 0 | | | L6933 | 1165930 |
| Freaghillaun | Fraochoileán | Galway | Atlantic Ocean | 39 | 30 | | | | | L732351 | 18262 |
| Illaungorm North | An tOileán Gorm Thuaidh | Galway | Bertraghboy Bay | 33 | 5 | 3 | 0 | None | | L7856639789 | 18313 |
| Inishnee | Inis Ní | Galway | Bertraghboy Bay | 856 | 48 | 455 | 49 | Road | 53°23′56″N 9°53′49″W﻿ / ﻿53.39889°N 9.89694°W﻿ / 53.39889; -9.89694﻿ (Inishnee) | L7441 | 18353 |
| Inishlackan | Inis Leacan | Galway | Gorteen Bay | 129 | 13 | 126 | 0 | | | L717375 | 18352 |
| Inishdawros | Inis Damhraí | Galway | Ballyconneely Bay | 22 | 3 | 8 | 0 | None | | L642409 | 18090 |
| Illaunamid | Oileán Imill | Galway | Atlantic Ocean | 29 | 27 | 30 | 0 | | | L517410 | 18192 |
| Turbot Island, Talbot Island, or Inish Toirbirt | Tairbeart | Galway | Atlantic Ocean | 148 | 13 | 146 | 2 | None | 53°30′2.63″N 10°8′59.42″W﻿ / ﻿53.5007306°N 10.1498389°W﻿ / 53.5007306; -10.1498389﻿ (Turbot Island) | L574522 | 18142 |
| Inishturk or Inishturk South | Inis Toirc Theas | Galway | Atlantic Ocean | 133 | 37 | 84 | 0 | None | 53°30′32″N 10°8′59″W﻿ / ﻿53.50889°N 10.14972°W﻿ / 53.50889; -10.14972﻿ (Inishturk South) | L5753 | 1166271 |
| Omey Island | Iomaí | Galway | Atlantic Ocean | 522 | 28 | 397 | 5 | | 53°32′7″N 10°9′27″W﻿ / ﻿53.53528°N 10.15750°W﻿ / 53.53528; -10.15750﻿ (Omey Island) | L5755 | 1166277 |
| Cruagh Island | an Chruach | Galway | Atlantic Ocean | 83 | 62 | 0 | 0 | | | L5355 | 18367 |
| High Island | Ardoileán | Galway | Atlantic Ocean | 82 | 63 | 0 | 0 | | 53°32′47″N 10°15′25″W﻿ / ﻿53.54639°N 10.25694°W﻿ / 53.54639; -10.25694﻿ (Ardoileán) | L5057 | 18376 |
| Inishbofin | Inis Bó Finne | Galway | Atlantic Ocean | 3151 | 89 | 1404 | 184 | Passenger ferry from Cleggan | 53°37′N 10°12′W﻿ / ﻿53.617°N 10.200°W﻿ / 53.617; -10.200﻿ (Inishbofin) | L5565 | 18238 |
| Inishlyon | Inis Laighean | Galway | Atlantic Ocean | 75 | 43 | 0 | 0 | | | L566646 | 18241 |
| Inishark or Inishshark | Inis Airc | Galway | Atlantic Ocean | 581 | 100 | 208 | 0 | | 53°36′42″N 10°16′58″W﻿ / ﻿53.61167°N 10.28278°W﻿ / 53.61167; -10.28278﻿ (Inishark) | L5067 | 1166239 |
| Davillaun | Damhoileán | Galway | Inishbofin group | 60 | 28 | 0 | 0 | | | L587663 | 18234 |
| Crump Island | Oileán Dá Chruinne | Galway | Atlantic Ocean | 63 | 25 | 16 | 0 | | | L6865 | 18144 |
| Inishturk | Inis Toirc | Mayo | Atlantic Ocean | 1446 | 191 | 577 | 56 | Passenger ferry from Roonah Quay, beyond Louisburgh | 53°42′5″N 10°6′30″W﻿ / ﻿53.70139°N 10.10833°W﻿ / 53.70139; -10.10833﻿ (Inishturk) | L6174 | 1375327 |
| Caher Island | Oileán na Cathrach | Mayo | Atlantic Ocean | 128 | 61 | 0 | 0 | | 53°43′3″N 10°1′38″W﻿ / ﻿53.71750°N 10.02722°W﻿ / 53.71750; -10.02722﻿ (Caher Island) | L6676 | 1166544 Archived 14 August 2012 at the Wayback Machine |
| Clare Island | Cliara | Mayo | Clew Bay | 3949 | 462 (Knockmore) | 1615 | 138 | Passenger ferry from Roonah Quay, beyond Louisburgh | 53°48′18″N 9°59′37″W﻿ / ﻿53.80500°N 9.99361°W﻿ / 53.80500; -9.99361﻿ (Clare Island) | L6885 | 36982 |
| Dorinish (Dorinish More and Dorinish Beg) | Deoirinis | Mayo | Clew Bay | 15 | 25 | 13 | 0 | | 53°48′45″N 9°40′18″W﻿ / ﻿53.81250°N 9.67167°W﻿ / 53.81250; -9.67167﻿ (Dorinish) | L900858 | 37268 |
| Inisheeny | Inis Aonaigh | Mayo | Westport Bay | 26 | 22 | 36 | | | | L920845 | 37323 |
| Inishraher | Inis Raithir | Mayo | Westport Bay | 27 | 33 | 25 | 0 | | | L925852 | 37291 |
| Annagh Islands | | Mayo | Westport Bay | 48 (East) 12 (Middle) 17 (West) | 9 (East) 6 (West) | 33 (total) | | | | L948833 | 114009 |
| Illanataggart | Oileán an tSagairt | Mayo | Clew Bay | 30 | 28 | 33 | 0 | | | L928868 | 37275 |
| Crovinish | Croibhinis | Mayo | Dorinish Harbour | 29 | 23 | 32 | | | | L918866 | 37260 |
| Inishlyre | Inis Ladhair | Mayo | Dorinish Harbour | 52 | 26 | 113 | 3 | | | L912873 | 37288 |
| Inishgort | Inis Goirt | Mayo | Clew Bay | 28 | 29 | 32 | 0 | | | L902879 | 37281 |
| Collanmore Island or Collan More Island | Collainn Mhór | Mayo | Clew Bay | 197 | 53 | 213 | 5 | | | L920882 | 37253 |
| Clynish | Claidhnis | Mayo | Clew Bay | 80 | 42 | 87 | 3 | | | L923894 | 37251 |
| Island More | an tOileán Mór | Mayo | Clew Bay | 77 | 42 | 88 | 3 | | | L903893 | 37293 |
| Knockycahillaun | Cnoc Uí Chathaláin | Mayo | Clew Bay | 34 | 36 | 41 | 0 | None | | L910896 | 37298 |
| Derrinish | Dairinis | Mayo | Newport Bay | 30 | 21 | 40 | | | | L913902 | 37262 |
| Inishbee | | Mayo | Newport Bay | 38 | 29 | 20 | | | | L901902 | 37279 |
| Inishgowla | Inis Gabhla | Mayo | Newport Bay | 32 | 28 | 52 | | | | L911911 | 37282 |
| Inishoo | Inis Uamha | Mayo | Newport Bay | 17 | 29 | 29 | | | | L901911 | 37290 |
| Inishnakillew | Inis na Coilleadh | Mayo | Newport Bay | 59 | 27 | 126 | 5 | Causeway | | L937902 | 37289 |
| Inishcottle | Inis Cotail | Mayo | Newport Bay | 24 | 26 | 40 | 3 | Causeway via Inishnakillew | | L928905 | 37280 |
| Inishturk | Inis Toirc | Mayo | Newport Bay | 59 | 51 | 577 | 56 | | | L940909 | 37292 |
| Inishdaff | Inis Damh | Mayo | Newport Bay | 33 | 31 | 44 | | | | L948914 | 37099 |
| Rosbarnagh Island | Oileán Ros Bairneach | Mayo | Newport Bay | 53 | 37 | 42 | | Road bridge | | L953926 | 37089 |
| Inishturlin | | Mayo | Newport Bay | 21 | 27 | 25 | | | | L947931 | 37079 |
| Rosmore Island | An Ros Mór | Mayo | Newport Bay | 104 | 28 | 133 | | Road bridge | | L961942 | 37436 |
| Rosturk Island | Ros Toirc | Mayo | Newport Bay | 34 | 24 | 64 | | Connected at low tide | | L913946 | 37494 |
| Inishquirk | Inis Coirce | Mayo | Newport Bay | 28 | 44 | 37 | | | | L904943 | 37472 |
| Inishtubbrid | | Mayo | Newport Bay | 37 | 28 | 42 | | | | L897947 | 37473 |
| Inishnacross | Inis na Croise | Mayo | Newport Bay | 26 | 36 | 27 | | | | L888941 | 37471 |
| Inishbobunnan | | Mayo | Newport Bay | 24 | 31 | 13 | | | | L889954 | 37459 |
| Inishgowla | | Mayo | Newport Bay | 32 | 32 | 28 | | | | L887950 | 37467 |
| Inishilra | | Mayo | Newport Bay | 8 | 18 | 12 | | | | L895939 | 37468 |
| Inishkeel | Inis Caol | Mayo | Newport Bay | 30 | 27 | 23 | | | | L878953 | 37469 |
| Inisherkin | Inis Earcáin | Mayo | Newport Bay | 31 | 30 | 28 | | | | L878945 | 37466 |
| Inishcooa | | Mayo | Newport Bay | 21 | 27 | 6 | | | | L876938 | 37461 |
| Moynish More | Maínis Mór | Mayo | Clew Bay | 62 | 37 | 99 | | | | L864945 | 37481 |
| Achill Island | Acaill | Mayo | Atlantic Ocean | 35283 | 688 (Croaghaun) | 4901 | 2345 | Road bridge (Michael Davitt Bridge) | 54°N 10°W﻿ / ﻿54°N 10°W﻿ / 54; -10﻿ (Achill Island) | F6803 | 1165355 |
| Achillbeg | Acaill Bheag | Mayo | Atlantic Ocean | 331 | 110 | 178 | 1 | | 53°51′N 9°57′W﻿ / ﻿53.850°N 9.950°W﻿ / 53.850; -9.950﻿ (Achillbeg) | L7292 | 1165356 |
| Annagh Island | Oileán an Eanaigh | Mayo | Blacksod Bay | 627 | 23 | 0 | 0 | | | F778052 | 36937 |
| Inishbiggle | Inis Bigil | Mayo | Blacksod Bay | 637 | 34 | 67 | 12 | | 53°59′45″N 9°54′15″W﻿ / ﻿53.99583°N 9.90417°W﻿ / 53.99583; -9.90417﻿ (Inishbiggle) | F7507 | 36863 |
| Barranagh Island | Oileán Bearanach | Mayo | Elly Bay | 63 | 7 | 0 | 0 | Tombolo | | F667258 | 35255 |
| Duvillaun Beg | Dubhoileán Beag | Mayo | Atlantic Ocean | 25 | 14 | 0 | 0 | | | F5916 | 35271 |
| Duvillaun More | Dubhoileán Mór | Mayo | Atlantic Ocean | 155 | 60 | 31 | 0 | | | F5816 | 35272 |
| Inishkea South | Inis Gé Theas | Mayo | Inishkea Islands | 344 | 72 (Knocknaskea) | 62 | 0 | | | F5420 | 35278 |
| Inishkea North | Inis Gé Thuaidh | Mayo | Inishkea Islands | 464 | 24 | 155 | 0 | | | F5623 | 35277 |
| Inishglora | Inis Gluaire | Mayo | Atlantic Ocean | 37 | 22 | 16 | 0 | | 54°12′31″N 10°7′38″W﻿ / ﻿54.20861°N 10.12722°W﻿ / 54.20861; -10.12722﻿ (Inishglora) | F6131 | 1166254 Archived 20 August 2012 at the Wayback Machine |
| Eagle Island | Oileán sa Tuaidh | Mayo | Atlantic Ocean | 14 | 60 | 15 | 0 | | | F6339 | 1166546 Archived 20 August 2012 at the Wayback Machine |
| Kid Island | Oileán Mionnán | Mayo | Broadhaven Bay | 25 | 86 | 0 | 0 | | | F787436 | 35405 |
| Illanmaster | Oileán Máistir | Mayo | Atlantic Ocean | 7 | 108 | 0 | 0 | None | 54°20′N 9°38′W﻿ / ﻿54.333°N 9.633°W﻿ / 54.333; -9.633﻿ (Illanmaster) | F934432 | 1399573 |
| Bartragh Island | an Bheartrach | Mayo | Killala Bay | 316 | 26 | 28 | 0 | None | 54°12′50″N 9°9′47″W﻿ / ﻿54.21389°N 9.16306°W﻿ / 54.21389; -9.16306﻿ (Bartragh) | G245300 | 34513 |
| Inishmulclohy or Coney Island | Inis Uí Mhaolchluiche | Sligo | Sligo Harbour | 388 | 13 | 124 | 1 | Connected by strand at low tide | | G617388 | 45348 |
| Oyster Island | Inis Rórais | Sligo | Sligo Harbour | 33 | 14 | 28 | 0 | | | G631393 | 45365 |
| Inishmurray | Inis Muirígh | Sligo | Donegal Bay | 209 | 23 | 0 | 0 | | 54°26′N 8°40′W﻿ / ﻿54.433°N 8.667°W﻿ / 54.433; -8.667﻿ (Inishmurray) | G572539 | 45211 |
| Conor's Island | Oileán Chonchúir | Sligo | Donegal Bay | 111 | 16 | 15 | 0 | Road (no longer an island) | | F654515 | 45206 |
| Dernish | Dairinis | Sligo | Donegal Bay | 103 | 32 | 42 | 0 | | | G677528 | 45207 |
| Inishpat | | Donegal | Donegal Harbour | 17 | 25 | 7 | | | | F591874 | 14142 |
| Rooney's Island | Oileán Uí Ruanaí | Donegal | Donegal Harbour | 34 | 32 | 6 | | | | F591875 | 14297 |
| Rotten Island | an tOileán Bréan | Donegal | Killybegs Harbour | 1 | | 11 | 0 | | 54°36′52.13″N 8°26′25.55″W﻿ / ﻿54.6144806°N 8.4404306°W﻿ / 54.6144806; -8.4404306 | F715742 | 14875 |
| Rathlin O'Birne Island | Reachlainn Uí Bhirn | Donegal | Atlantic Ocean | 50 | 26 | 0 | 0 | | | G4680 | 1166602 |
| Inishkeel | Inis Caoil | Donegal | Gweebarra Bay | 81 | 19 | 16 | 0 | Connected by strand at low tide | 54°50′51″N 8°27′22″W﻿ / ﻿54.84750°N 8.45611°W﻿ / 54.84750; -8.45611﻿ (Inishkeel) | B7000 | 1166244 |
| Inishkeeragh | Inis Caorach | Donegal | Atlantic Ocean | 47 | 6 | 52 | 0 | | | B683123 | 14535 |
| Inishfree Upper | Inis Fraoigh | Donegal | Dunglow Bay | 541 | 14 | 137 | 9 | | 54°57′20″N 8°26′40″W﻿ / ﻿54.95556°N 8.44444°W﻿ / 54.95556; -8.44444﻿ (Rutland Island) | B715120 | 14945 |
| Inishal | Inis Saille | Donegal | Dunglow Bay | 71 | 6 | 43 | | | | B727113 | 14943 |
| Rutland Island or Inishmacadurn | Inis Mhic an Doirn | Donegal | Atlantic Ocean | 313 | ≥20 | 125 | 12 | | 54°58′41″N 8°27′27″W﻿ / ﻿54.97806°N 8.45750°W﻿ / 54.97806; -8.45750﻿ (Rutland Island) | B707142 | 15002 |
| Inishcoo | Inis Cú | Donegal | Atlantic Ocean | 109 | 15 | | 0 | None. | 54°59′13″N 8°27′50″W﻿ / ﻿54.98694°N 8.46389°W﻿ / 54.98694; -8.46389﻿ (Inishcoo) | B706156 | 15000 |
| Eighter Island | an tÍochtar | Donegal | Atlantic Ocean | 60 | 24 | 59 | 0 | None | 54°59′30″N 8°28′27″W﻿ / ﻿54.99167°N 8.47417°W﻿ / 54.99167; -8.47417﻿ (Eighter Island) | B698161 | 14997 |
| Arranmore or Aran Island | Árainn Mhór | Donegal | Atlantic Ocean | 4335 | 227 | 1431 | 478 | Car ferry to Burtonport | 54°59′22″N 8°31′51″W﻿ / ﻿54.98944°N 8.53083°W﻿ / 54.98944; -8.53083﻿ (Arranmore) | B6616 | 14527 |
| Cruit Island | an Chruit | Donegal | Rosses Bay | 941 | 32 | 258 | 92 | Road bridge | 55°3′3″N 8°14′8″W﻿ / ﻿55.05083°N 8.23556°W﻿ / 55.05083; -8.23556﻿ (Cruit Island) | B7321 | 111107 |
| Owey Island | Uaigh | Donegal | Rosses Bay | 301 | 102 | 94 | 27 | | 55°3′17″N 8°27′3″W﻿ / ﻿55.05472°N 8.45083°W﻿ / 55.05472; -8.45083﻿ (Owey Island) | B712231 | 15013 |
| Inishfree Lower | Inis Fraoigh | Donegal | Inishfree Bay | 45 | 25 | 0 | 0 | | | B756241 | 14514 |
| Inishinny | Inis Sionnaigh | Donegal | Gweedore Bay | 62 | 27 | 4 | 0 | | | B785252 | 1390473 |
| Gola Island | Gabhla | Donegal | Gweedore Bay | 424 | 68 | 68 | 15 | | 55°3′3″N 8°14′8″W﻿ / ﻿55.05083°N 8.23556°W﻿ / 55.05083; -8.23556﻿ (Gola Island) | B7727 | 14467 |
| Inishmeane | Inis Meáin | Donegal | Gweedore Bay | 117 | 33 | 12 | 0 | | 55°06′15.65″N 8°20′46.04″W﻿ / ﻿55.1043472°N 8.3461222°W﻿ / 55.1043472; -8.3461222﻿ (Inishmeane) | B785286 | 14495 |
| Inishsirrer | Inis Oirthir | Donegal | Gweedore Bay | 109 | 23 | 0 | 0 | | 55°07′04″N 8°20′36″W﻿ / ﻿55.11778°N 8.34333°W﻿ / 55.11778; -8.34333﻿ (Inishsirrer) | B7830 | 1166267 |
| Inishbofin | Inis Bó Finne | Donegal | Tory Sound | 298 | 33 | 121 | 16 | | 55°10′24″N 8°10′8″W﻿ / ﻿55.17333°N 8.16889°W﻿ / 55.17333; -8.16889﻿ (Inishbofin) | B889365 | 14448 |
| Inishdooey | Oileán Dúiche | Donegal | Tory Sound | 87 | 38 | 9 | | | 55°11′24″N 8°9′50″W﻿ / ﻿55.19000°N 8.16389°W﻿ / 55.19000; -8.16389﻿ (Inishdooey) | B896383 | 14449 |
| Tory Island | Toraigh | Donegal | Atlantic Ocean | 785 | 83 | 399 | 141 | Passenger ferries to Bunbeg and Meenlaragh near Falcarragh | 55°15′45″N 8°13′0″W﻿ / ﻿55.26250°N 8.21667°W﻿ / 55.26250; -8.21667﻿ (Tory Island) | B851465 | 14500 |
| Island Roy | Oileán an Bhráighe | Donegal | Mulroy Bay | 91 | 12 | 74 | 13 | Road causeway | | C133381 | 16063 |
| Aughnish | | Donegal | Lough Swilly | 66 | 25 | 26 | 3 | Road causeway | | C252215 | 15974 |
| Inch Island | an Inis | Donegal | Lough Swilly | 3425 | 222 | 978 | 438 | Road causeways | 55°04′08″N 7°29′18″W﻿ / ﻿55.06889°N 7.48833°W﻿ / 55.06889; -7.48833﻿ (Inch Island) | C3324 | 1166237 |
| Inishtrahull | Inis Trá Tholl | Donegal | Atlantic Ocean | 113 | 49 | 54 | 0 | | 55°25′48″N 7°14′2″W﻿ / ﻿55.43000°N 7.23389°W﻿ / 55.43000; -7.23389﻿ (Inishtrahull) | C4565 | 14546 |

### Notes

* ↑ Taken from the Placenames Database of Ireland entry linked in the PDI ref column
* ↑ Unless stated otherwise, area is from Ordnance Survey Ireland's 19th-century 6" maps (viewable via the Historic 6" layer of the link in the OS-map column)
* ↑ Unless stated otherwise, height is from Ordnance Survey Ireland's 1:50,000 series maps (viewable for Republic of Ireland islands via the Wind Report layer of the link in the OS-map column )
* 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 Converted from height in feet given on Ordnance Survey Ireland's 19th-century 6" maps (viewable via the Historic 6" layer of the link in the OS-map column)
* 1 2 3 4 5 6 19th-century area, before reclamation
* 1 2 Combined total of Dunkerron Island East and Dunkerron Island West.
* 1 2 Dunkerron Island East and West are connected at low tide.
* 1 2 3 Cappanacush is the largest of the Greenane Islands. It is listed separately and its area and population are excluded from the totals. It constitutes a separate townland.
* ↑ 170 in 1851
* ↑ Not enumerated separately from Rossdoohan townland on the mainland; combined population 163.
* ↑ 11 in 1911
* ↑ 13 in 1881
* ↑ Duínis on OSI 1:50,000 map
* ↑ The maximum spot height of 24 feet on the 6" map is incompatible with the 20-metre contour line present on the 1:50,000 map.
* ↑ Inis Bhig on OSI 1:50,000 map
* 1 2 Tawin Island comprise the townland of Tawin West (218 acres (88 hectares), 108 people) and part of the townland of Tawin East (179 acres (72 hectares), 193 people). Tawin East Island comprises the balance of the townland of Tawin East.
* ↑ Excluding the tombolo linking Dorinish More and Dorinish Beg
* 1 2 Island More and Knockycahillaun are now connected;
* 1 2 Comprising townlands of Rosmore (78 acres (32 hectares), 90 people) and Lisduff (27 acre, 43 people)
* ↑ 18 in 1851
* ↑ Excluding the 10 acres (4.0 hectares) of Kinkeel, connected at low tide.
* 1 2 There is a foot bridge between Eighter and Inishcoo.
* ↑ 30 in 1861