L
- (County Monaghan) Lislea
- (County Donegal) Lergynasearhagh
- (An Cabhán) Lisreagh
- (An Cabhán) Lisduff
- (An Cabhán) Lisnamandra
- (An Cabhán) Lagan
- (County Donegal) Listicall
- (County Donegal) Leslie Hill
- (County Donegal) Lisclamer
- (County Donegal) Lismoghry
- (County Donegal) Lettergull
- (County Donegal) Leaght
- (County Donegal) Liscooly
- (County Donegal) Liscooly Bridge
- (County Donegal) Lettermacaward
- (County Donegal) Lubber
- (County Donegal) Letterleague
- (County Donegal) Listack
- (County Donegal) Legland
- (County Donegal) Lettermakenny
- (County Donegal) Lougheraherk
- (An Cabhán) Lisnageer
- (County Monaghan) Lurganearly
- (An Cabhán) Legnagrow
- (An Cabhán) Leck
- (County Monaghan) Lennaght
- (County Monaghan) Leitrim
- (County Monaghan) Latnamard
- (County Monaghan) Lisnalee
- (County Monaghan) Lurganboy