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| Townland | Parish | County |
| Hackincon | Kilskeery | Tyrone |
| Half Umry | Antrim | Antrim |
| Halfgayne | Killelagh | Londonderry |
| Halftown | Donegore | Antrim |
| Halftown | Errigalkeerogue | Tyrone |
| Hare Island | Drumkeeran | Fermanagh |
| Hare Island | Greyabbey | Down |
| Harpurs Hill | Coleraine | Londonderry |
| Harvey's Rock | Duneane | Antrim |
| Hass | Dungiven | Londonderry |
| Headwood | Kilwaughter | Antrim |
| Heagles | Ballymoney | Antrim |
| Heagles | Ballymoney | Londonderry |
| Hen Island | Killinchy | Down |
| Henrystughan | Aghalurcher | Fermanagh |
| Herdstown | Donaghadee | Down |
| Hermitage | Currin | Fermanagh |
| Heron Island | Inishmacsaint | Fermanagh |
| High Cross | Donaghenry | Tyrone |
| Highlandtown | Ardclinis | Antrim |
| Highmoor | Cumber Lower | Londonderry |
| Hightown | Kilwaughter | Antrim |
| Hillhall | Drumbeg | Down |
| HillHead | Longfield West | Tyrone |
| Hill's Island | Inishmacsaint | Fermanagh |
| Hillsborough | Hillsborough | Down |
| Hogstown | Donaghadee | Down |
| Holestone | Kilbride | Antrim |
| Hollybank or Ederdaglass | Cleenish | Fermanagh |
| Hollybrook | Aghalurcher | Fermanagh |
| Hollyhill | Leckpatrick | Tyrone |
| Hollymount | Aghavea | Fermanagh |
| Hollymount | Down | Down |
| Holy Well | Antrim | Antrim |
| Holywood | Holywood | Down |
| Horse Carrick | Billy | Antrim |
| Horse Island | Derryvullan | Fermanagh |
| Horse Island | Inishargy | Down |
| Horse Island | Magheraculmoney | Fermanagh |
| Hungry Hall | Antrim | Antrim |
| Hunter's Glebe | Dunboe | Londonderry |
| Hurtletoot | Antrim | Antrim |