- Laflin (Population: 1,502)
- Lake City (Population: 2,811)
- Lake Heritage (Population: 1,136)
- Lake Meade (Population: 1,832)
- Lake Wynonah (Population: 1,961)
- Lancaster (Population: 56,348)
- Langhorne (Population: 1,981)
- Lansdale (Population: 16,071)
- Lansdowne (Population: 11,044)
- Lansford (Population: 4,230)
- Larksville (Population: 4,694)
- Latrobe (Population: 8,994)
- Laureldale (Population: 3,759)
- Lawnton (Population: 3,787)
- Lawrence Park (Population: 4,048)
- Lawson Heights (Population: 2,339)
- Leacock-Leola-Bareville (Population: 6,625)
- Lebanon (Population: 24,461)
- Lebanon South (Population: 2,145)
- Leechburg (Population: 2,386)
- Leesport (Population: 1,805)
- Leetsdale (Population: 1,232)
- Lehighton (Population: 5,537)
- Leith-Hatfield (Population: 2,820)
- Lemont (Population: 2,116)
- Lemoyne (Population: 3,995)
- Lenape Heights (Population: 1,212)
- Levittown (Population: 53,966)
- Lewisburg (Population: 5,620)
- Lewistown (Population: 8,998)
- Liberty (Population: 2,670)
- Ligonier (Population: 1,695)
- Lima (Population: 3,225)
- Lincoln (Population: 1,218)
- Linesville (Population: 1,155)
- Linglestown (Population: 6,414)
- Linntown (Population: 1,542)
- Linwood (Population: 3,374)
- Lionville-Marchwood (Population: 6,298)
- Lititz (Population: 9,029)
- Littlestown (Population: 3,947)
- Lock Haven (Population: 9,149)
- Lorane (Population: 2,994)
- Loretto (Population: 1,190)
- Lower Allen (Population: 6,619)
- Lower Burrell (Population: 12,608)
- Luzerne (Population: 2,952)
- Lykens (Population: 1,937)
- Lynnwood-Pricedale (Population: 2,168)
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