A
- (County Leitrim) Annagh
- (Roscommon) Alderford
- (Sligo) Ardline
- (County Galway) An Baile Thiar
- (County Galway) An tOileán Iarthach
- (County Galway) An Fhairche
- (Sligo) Aughris
- (County Leitrim) Aughnasheelan
- (County Galway) Attymon
- (Mayo County) Attimachugh
- (County Leitrim) Askill
- (County Leitrim) Ashakiltubbrid
- (Roscommon) Arigna
- (County Galway) Ardranny
- (Mayo County) Ardnaree
- (County Galway) Ard
- (County Galway) Islas Aran
- (County Leitrim) Annaghmore
- (Mayo County) Annaghroe Island
- (Mayo County) Annagh Island
- (Mayo County) Aille
- (Mayo County) Aghleam
- (County Leitrim) Aughavas
- (County Leitrim) Aghamore
- (Mayo County) Aghamore
- (Mayo County) Aghagower
- (Sligo) Aclare
- (Mayo County) Achill Island
- (Mayo County) Achillbeg Island
- (Mayo County) Achill