I
- (County Galway) Illauneeragh West
- (County Galway) Illaunard
- (County Galway) Illaunroe
- (County Galway) Inchaghaun
- (County Galway) Inishlay
- (County Galway) Inchamakinna
- (County Galway) Inisheltia
- (County Galway) Inishcorra
- (County Galway) Inchacommaun Islands
- (County Galway) Illaunaneel
- (County Galway) Inishdala Islands
- (County Galway) Invernisk
- (Roscommon) Inchinalee
- (County Galway) Inishbigger
- (County Galway) Inishtreh
- (County Galway) Inishdawros
- (County Galway) Illaunurra
- (Mayo County) Inishoo
- (Mayo County) Inishgowla
- (Mayo County) Inishlaughil
- (Mayo County) Inishturk
- (Mayo County) Inishnakillew
- (Mayo County) Illancroagh
- (Mayo County) Inishgowla
- (Mayo County) Inishdasky
- (Mayo County) Inishnacross
- (Mayo County) Illannaglashy
- (Mayo County) Inishaghod
- (Mayo County) Illanleamnahelty
- (Mayo County) Inagh