F
- (Sligo) Faughts
- (Sligo) Fairy Island
- (Sligo) Finisklin
- (Sligo) Feenaghmore
- (Sligo) Feenaghroe
- (Sligo) Fallougher
- (Sligo) Fidwog
- (County Leitrim) Fawnlion
- (County Leitrim) Fawnarry
- (Sligo) Foyoges
- (Sligo) Falnashammer
- (County Leitrim) Flughanagh
- (Roscommon) Fuerty
- (County Leitrim) Friarstown
- (County Galway) Friar Island
- (County Galway) Frenchfort
- (Mayo County) Frehill Island
- (County Galway) Freaghillaun South
- (County Galway) Freaghillaun North
- (County Galway) Fox Island
- (County Galway) Foxhall
- (Roscommon) Four Mile House
- (Mayo County) Foghill
- (County Leitrim) Fivemilebourne
- (Mayo County) Finny
- (County Galway) Finish Island
- (County Leitrim) Fenagh
- (Roscommon) Feevagh
- (County Galway) Fearagha
- (County Leitrim) Farnaght