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| Townland | Parish | County |
| Iderown | Grange of Drumtullagh | Antrim |
| Imdel | Drumballyroney | Down |
| Imeroo | Enniskillen | Fermanagh |
| Inch | Inch | Down |
| Inishcorkish | Aghalurcher | Fermanagh |
| Inishcreagh Island | Derrybrusk | Fermanagh |
| Inishcreenry (Island) | Aghalurcher | Fermanagh |
| Inishcrevan (Island) | Kinawley | Fermanagh |
| Inishee Island | Killesher | Fermanagh |
| Inisherk (Island) | Kinawley | Fermanagh |
| Inishfausy | Aghalurcher | Fermanagh |
| Inishfendra (Island) | Galloon | Fermanagh |
| Inishkeen | Cleenish | Fermanagh |
| Inishkeen | Enniskillen | Fermanagh |
| Inishleague (Island) | Aghalurcher | Fermanagh |
| Inishlirroo | Kinawley | Fermanagh |
| Inishlught | Kinawley | Fermanagh |
| Inishmacsaint (Island) | Inishmacsaint | Fermanagh |
| Inishmagh | Carnteel | Tyrone |
| Inishmakill (Island) | Magheraculmoney | Fermanagh |
| Inishore | Aghalurcher | Fermanagh |
| Inishroosk | Aghalurcher | Fermanagh |
| Inishteige | Cleenish | Fermanagh |
| Inishturk | Aghalurcher | Fermanagh |
| Inisloughlin | Magheramesk | Antrim |
| Inispollan A5096Mountain & Grange of | Grange of Inispollan | Antrim |
| Inisway | Inishmacsaint | Fermanagh |
| Innevall | Donaghenry | Tyrone |
| Inshaleen | Errigal | Londonderry |
| Inshamph | Dunaghy | Antrim |
| Inshinagh | Ballymoney | Antrim |
| Intake | Artrea | Londonderry |
| Intake | Artrea | Londonderry |
| Intake | Ballyscullion | Londonderry |
| Intake | Ballyscullion | Londonderry |
| Intake | Ballyscullion | Londonderry |
| Inver | Clones | Fermanagh |
| Inver | Inver | Antrim |
| Irish Hill | Ballynure | Antrim |
| Irishomerbane | Dunaghy | Antrim |
| Irishtown | Antrim | Antrim |
| Irragh | Grange of Layd | Antrim |
| Iskymeadow | Keady | Armagh |
| Island Carragh North | Dunluce | Antrim |
| Island Doo | Ballywillin | Londonderry |
| Island Effrick North | Ballyrashane | Londonderry |
| Island Flackey | Ballywillin | Londonderry |
| Island Henry | Bright | Down |
| Island Kelly | Derryaghy | Antrim |
| Islandacorr | Ballyphilip | Down |
| Islandahoe | Derrykeighan | Antrim |
| Islandbane | Grange of Muckamore | Antrim |
| Islandbane | Killinchy | Down |
| Islandboy | Grange of Drumtullagh | Antrim |
| Islandderry | Dromore | Down |
| IslandHeaghey | Coleraine | Londonderry |
| Islandhill | Donaghadee | Down |
| Islandlean | Ballintoy | Antrim |
| IslandMacallan | Ballintoy | Antrim |
| Islandmore | Killinchy | Down |
| Islandmore | Kilraghts | Antrim |
| Islandmore Lower | Ballywillin | Londonderry |
| Islandmoyle | Clonduff | Down |
| Islandoo | Ballintoy | Antrim |
| Islandoo | Culfeightrin | Antrim |
| Islandreagh | Grange of Nilteen | Antrim |
| Islandrose | Billy | Antrim |
| Islands of Carnmoon | Billy | Antrim |
| IslandTaggart | Killyleagh | Down |
| Island-Tasserty | Ballyaghran | Londonderry |
| Island-Vardin | Ballyaghran | Londonderry |
| Isle McCricket | Kilclief | Down |
| Isle of Benoney | Ballyaghran | Londonderry |
| Isle of Muck | Island Magee | Antrim |
| Isle O'Valla | Ballyculter | Down |
| IsleNamanfin | Derryvullan | Fermanagh |
| Issbawn or Upper Gortnagross | Layd | Antrim |