L
- (Meath) Lurganboy
- (Meath) Loughanbran
- (Meath) Loughanderg
- (Meath) Lordstown
- (Meath) Light Town
- (Meath) Lackmelch
- (Westmeath) Lisclogher Little
- (Meath) Lady Island
- (Meath) Ladyrath
- (Meath) Loganstown
- (Meath) Littlerath
- (Meath) Large Island
- (Meath) Liscartan
- (Meath) Lamberstown
- (Meath) Leggagh
- (Westmeath) Ladestown
- (An Longfort) Legan
- (Wicklow) Laragh
- (Kilkenny) Lawcus
- (Kildare) Ladytown
- (Louth) Lordship
- (Fingal County) Loughshinny
- (Louth) Louth
- (County Carlow) Leighlinbridge
- (An Longfort) Lanesborough
- (Meath) Longwood
- (Dún Laoghaire-Rathdown) Loughlinstown
- (Fingal County) Lusk
- (Meath) Laytown
- (South Dublin) Lucan