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- (Wicklow) Lowtown
- (Kildare) Lackareagh
- (Kildare) Loughabor
- (Kildare) Lughil
- (Kildare) Lipstown
- (Wicklow) Logatrina
- (County Carlow) Lemonstown Cross Roads
- (Kildare) Lackagh
- (Kildare) Limerick Bridge
- (Kildare) Lullybeg
- (Kildare) Littletown
- (Kildare) Laragh
- (Wicklow) Leabeg
- (Wicklow) Lugnaskeagh
- (Dún Laoghaire-Rathdown) Leopardstown
- (Fingal County) Luttrellstown
- (Wicklow) Lockstown Lower
- (Wicklow) Lockstown Upper
- (Wicklow) Lugnagun Great
- (Laois) Lough
- (Fingal County) Luttrell’s Cross Roads
- (Fingal County) Lispapple Cross Roads
- (Louth) Linns
- (Louth) Lurgan
- (Dublin City) Lower Clanbrassil
- (Kildare) Lackaghmore
- (Westmeath) Lunestown
- (Westmeath) Loughanstown
- (Westmeath) Lisclogher Great
- (Westmeath) Loughstown