- Lackawaxen
- Lafayette Hill
- Lahaska
- Lake
- Lake Ariel
- Lake Harmony
- Lake Winola
- Lakeville
- Lakewood
- Lamar
- Lancaster
- Lancaster Township
- Landenberg
- Landingville
- Landisburg
- Lanesboro
- Langhorne
- Langhorne Manor
- Lansdale
- Lansdowne
- Lanse
- Lansford
- Lattimer
- Laurys Station
- Le Raysville
- Lebanon
- Lederach
- Leechburg
- Leesport
- Lehigh
- Lehighton
- Lehman
- Lemont
- Lemoyne
- Lenhartsville
- Lenni
- Levittown
- Lewis Run
- Lewisberry
- Lewistown
- Liberty Township
- Lightstreet
- Lilly
- Limekiln
- Limeport
- Limestone
- Lincoln
- Lincoln University
- Line Lexington
- Lionville
- Lititz
- Littlestown
- Liverpool
- Lock Haven
- Loganville
- Long Pond
- Longswamp Township
- Lords Valley
- Loretto
- Lower Allen
- Lower Frederick
- Lower Gwynedd Township
- Lower Macungie Township
- Lower Merion Township
- Lower Milford Township
- Lower Nazareth Township
- Lower Saucon Township
- Loysville
- Lumberville
- Luzerne
- Lykens
- Lyons