- Laceyville
- Lafayette Hill
- Laflin
- Lake Arthur Estates
- Lake City
- Lake Heritage
- Lake Latonka
- Lake Meade
- Lake Winola
- Lake Wynonah
- Lakemont
- Lamar
- Lampeter
- Lancaster
- Landingville
- Landisburg
- Landisville
- Lanesboro
- Langeloth
- Langhorne
- Langhorne Manor
- Lansdale
- Lansdowne
- Lansford
- Laporte
- Larksville
- Latrobe
- Lattimer
- Laurel Mountain Park
- Laurel Run
- Laureldale
- Laurelton
- Laurys Station
- Lavelle
- Lawnton
- Lawrence
- Lawrence Park
- Lawrence Park
- Lawrenceville
- Lawrenceville
- Lawson Heights
- Le Raysville
- Lebanon
- Lebanon South
- Leechburg
- Leeper
- Leesport
- Leetsdale
- Lehighton
- Leith-Hatfield
- Lemont
- Lemont Furnace
- Lemoyne
- Lenape Heights
- Lenhartsville
- Lenkerville
- Leola
- Level Green
- Levittown
- Lewis Run
- Lewisberry
- Lewisburg
- Lewistown
- Liberty
- Liberty
- Liberty
- Light Street
- Ligonier
- Lilly
- Lima
- Lime Ridge
- Limerick
- Lincoln
- Lincoln Park
- Lincolnville
- Linesville
- Linglestown
- Linntown
- Linwood
- Lionville
- Lititz
- Little Britain
- Little Meadows
- Littlestown
- Liverpool
- Lock Haven
- Locustdale
- Loganton
- Loganville
- Long Branch
- Longfellow
- Lorain
- Lorane
- Loretto
- Lower Allen
- Lower Burrell
- Loyalhanna
- Lucerne Mines
- Lumber City
- Lumber City
- Luzerne
- Luzerne
- Lykens
- Lynnwood-Pricedale
- Lyons
