H
- (County Galway) Hen Island
- (Mayo County) Hag Island
- (Roscommon) Hodson Bay
- (County Galway) Hog Island
- (County Galway) Hedgetown
- (County Galway) Hemming’s Ville
- (County Galway) Hollymount
- (County Leitrim) Halls
- (Sligo) Highwood
- (Roscommon) Hogs Island
- (County Galway) Hare Island
- (County Galway) Hare Island
- (Mayo County) Heathlawn
- (County Galway) High Island
- (Roscommon) Hill Street
- (Mayo County) Hollymount
- (County Galway) Horse Island
- (Mayo County) Horse Island
- (County Galway) Horseleap Cross Roads
- (Sligo) Hughs Island
- (Sligo) Hawk Island
- (Sligo) Halfquarter
- (Sligo) Halfquarter
- (Roscommon) Hawksford
- (Mayo County) Hollowpark
- (County Galway) Headford