A
- (County Donegal) Aghaveagh
- (County Donegal) Aughagault Little
- (County Donegal) Aughagault
- (County Donegal) Ardy
- (County Donegal) Ards Beg
- (County Donegal) Ardnaree
- (An Cabhán) Ardlougher
- (County Donegal) Aran Island
- (An Cabhán) Anns Fort
- (County Donegal) Alt Upper
- (County Donegal) Altnapaste
- (County Donegal) Alt Lower
- (County Donegal) Altadush
- (County Donegal) Aghlem Bridge
- (County Donegal) Allagh Island
- (County Donegal) Altadoo
- (County Donegal) Aghalough
- (County Donegal) Ardeevin
- (County Donegal) Ashbrook
- (County Donegal) Altahalla
- (County Donegal) Aught Upper
- (County Donegal) Ardmore
- (County Donegal) Aughnish Isle
- (County Donegal) Aghangaddy
- (County Donegal) Arryheernabin
- (County Donegal) Ards
- (County Donegal) Aghalenty
- (County Monaghan) Aghabog
- (County Monaghan) Annyalla
- (County Donegal) Annagary