F
- (Mayo County) Forillan
- (Mayo County) Freaghillanluggagh
- (Mayo County) Forillan
- (Mayo County) Fauleens
- (Mayo County) Fahy
- (Mayo County) Fahy Beg
- (Mayo County) Farnaght
- (Mayo County) Fairhill
- (Mayo County) Freaghillan Island
- (Mayo County) Forkfield
- (County Galway) Fearann an Choirce
- (Mayo County) Falleighter
- (Mayo County) Faheens
- (Mayo County) Faughil
- (Mayo County) Forthill
- (Roscommon) Friarshill
- (Roscommon) Frasnadeffa
- (Roscommon) Fallsollus
- (Roscommon) Fairymount
- (Roscommon) Figh
- (Roscommon) French Park Demesne
- (Sligo) Farranyharpy
- (Sligo) Falduff
- (Sligo) Fallathurteen
- (Sligo) Finnure
- (Sligo) Finlough
- (Sligo) Fetherneen
- (Sligo) Flowerhill
- (Sligo) Freeheen
- (Sligo) Farranacardy