- La Plata
- La Vale
- Lake Arbor
- Lake Shore
- Landover
- Landover Hills
- Langley Park
- Lanham
- Lanham-Seabrook
- Lansdowne
- Largo
- Laurel
- Layhill
- Laytonsville
- Leisure World
- Leitersburg
- Leonardtown
- Lexington Park
- Libertytown
- Linganore
- Linthicum
- Little Orleans
- Loch Lynn Heights
- Lochearn
- Lonaconing
- Londontowne
- Long Beach
- Luke
- Lusby
- Lutherville
- Lutherville-Timonium
