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- (County Galway) Loughaclerybeg
- (County Galway) Liscune
- (County Galway) Lisnascreena
- (Roscommon) Lowtown
- (Roscommon) Long Island
- (County Galway) Leagaun
- (County Galway) Letter More
- (Mayo County) Letterlough
- (Mayo County) Letter
- (Mayo County) Levally
- (Mayo County) Largan
- (Mayo County) Lack
- (Mayo County) Leckee
- (Sligo) Lackanatlieve
- (Mayo County) Letterbrick
- (Mayo County) Leamadartaun
- (Mayo County) Letterask
- (Mayo County) Largan
- (Mayo County) Leamareha Island
- (Mayo County) Lugnalettin
- (Mayo County) Lenahaun
- (County Galway) Lower Dangan
- (Mayo County) Leamalaggart
- (Mayo County) Lagduff Beg
- (Mayo County) Lagduff More
- (Mayo County) Letierbeg
- (Mayo County) Leam
- (Mayo County) Lurgacloy
- (Mayo County) Loughnahelly
- (Mayo County) Lahardaun