- Laceyville
- Lack
- Lackawannock
- Lackawaxen
- Lafayette
- Lafayette Hill
- Laflin
- Lake
- Lake
- Lake
- Lake Ariel
- Lake Como
- Lake Harmony
- Lake Heritage
- Lake Latonka
- Lake Meade
- Lake Winola
- Lake Wynonah
- Lakeville
- Lakewood
- Lampeter
- Lancaster
- Lancaster
- Lancaster Township
- Landenberg
- Landisburg
- Landisville
- Lanesboro
- Langhorne
- Langhorne Manor
- Lansdale
- Lansdowne
- Lansford
- Laporte
- Larksville
- Lathrop
- Latimore
- Latrobe
- Lattimer
- Laureldale
- Laurys Station
- Lavelle
- Lawnton
- Lawrence
- Lawrence
- Lawrence
- Lawrence Park
- Lawrenceville
- Lawson Heights
- Leacock
- Lebanon
- Lebanon
- Lebanon South
- LeBoeuf
- Leechburg
- Leeper
- Leesport
- Leet
- Leetsdale
- Lehigh
- Lehigh
- Lehigh
- Lehighton
- Lehman
- Lehman
- Leith-Hatfield
- Lemont
- Lemont Furnace
- Lemoyne
- Lenape Heights
- Lenhartsville
- Lenkerville
- Lenox
- Leola
- Letterkenny
- Level Green
- Levittown
- Lewis
- Lewis Run
- Lewisberry
- Lewisburg
- Lewistown
- Liberty
- Liberty
- Liberty
- Liberty
- Liberty
- Liberty
- Liberty
- Liberty
- Liberty Township
- Licking
- Licking Creek
- Lickingville
- Ligonier
- Ligonier Township
- Lima
- Limekiln
- Limerick
- Limestone
- Limestone
- Lincoln
- Lincoln
- Lincoln
- Lincoln University
- Linesville
- Linglestown
- Linntown
- Linwood
- Lionville
- Litchfield
- Lititz
- Little Meadows
- Littlestown
- Liverpool
- Liverpool Township
- Lock Haven
- Logan
- Loganville
- London Britain
- London Grove
- Londonderry
- Londonderry
- Londonderry
- Long Branch
- Long Pond
- Longswamp
- Loop
- Lopez
- Lorane
- Lords Valley
- Lower Allen
- Lower Alsace
- Lower Burrell
- Lower Chanceford
- Lower Chichester
- Lower Frankford
- Lower Frederick
- Lower Gwynedd
- Lower Heidelberg
- Lower Macungie
- Lower Macungie Township
- Lower Makefield
- Lower Merion
- Lower Mifflin
- Lower Milford
- Lower Milford Township
- Lower Moreland
- Lower Mount Bethel
- Lower Nazareth
- Lower Nazareth Township
- Lower Oxford
- Lower Paxton
- Lower Pottsgrove
- Lower Providence
- Lower Salford
- Lower Saucon
- Lower Saucon Township
- Lower Southampton
- Lower Swatara
- Lower Towamensing
- Lower Turkeyfoot
- Lower Tyrone
- Lower Windsor
- Lower Yoder
- Lowhill
- Loyalhanna
- Loyalsock
- Loysville
- Lucinda
- Ludlow
- Lumberville
- Lurgan
- Luzerne
- Luzerne
- Luzerne Township
- Lykens
- Lykens Township
- Lynn
- Lynnwood-Pricedale