L
- (Sligo) Lugdoon
- (Sligo) Letterunshin
- (Sligo) Lahardan
- (Sligo) Lissaneeny
- (Sligo) Lisconny Bridge
- (Sligo) Lahanagh
- (Sligo) Lisgorey
- (Sligo) Lugnagall
- (County Leitrim) Lismoyle
- (County Leitrim) Lisconor
- (County Leitrim) Lavaur
- (County Leitrim) Liscarban
- (County Leitrim) Loughtown
- (County Leitrim) Lisomadaun
- (County Leitrim) Lisroughly
- (County Leitrim) Letter
- (County Leitrim) Lugmeeltan
- (County Leitrim) Liscoghil
- (County Leitrim) Leckaun
- (County Leitrim) Lisgorman
- (County Leitrim) Lissinagroagh
- (County Leitrim) Lisnabrack
- (County Leitrim) Leckanarainey
- (County Leitrim) Liscally
- (County Leitrim) Lissiniska
- (County Galway) Laghtyslaughnessy
- (County Galway) Loughcurra
- (County Galway) Loughcarrick Island
- (County Galway) Loughamore
- (County Galway) Loughaconeera