I
- (Mayo County) Island More
- (Mayo County) Islandeady
- (County Galway) Inveran
- (Mayo County) Inver
- (County Galway) Inishturk
- (County Galway) Inishturk
- (County Galway) Inishtravin
- (County Galway) Inishskinny
- (County Galway) Inishshark
- (Sligo) Inishmurray
- (County Galway) Inishmore
- (County Galway) Inishmicatreer
- (County Galway) Inishman
- (County Galway) Inishlyon
- (County Galway) Inishlackan
- (Mayo County) Inishkeeragh
- (County Galway) Inishkeeragh
- (Mayo County) Inishkea South
- (Mayo County) Inishkea North
- (County Galway) Inishgort
- (Mayo County) Inishglora
- (County Galway) Inisheer
- (County Galway) Inishdugga
- (County Galway) Inishdoorus
- (Mayo County) Inishdegil More
- (County Galway) Inishdalla
- (County Galway) Inishbroon
- (County Galway) Inishbofin
- (Mayo County) Inishbiggle
- (Mayo County) Inishbee