- Lake Grove
- Lake Katrine
- Lake Mohegan
- Lake Placid
- Lake Ronkonkoma
- Lake Success
- Larchmont
- Lattingtown
- Laurel Hollow
- Le Roy
- Lido Beach
- Lincolndale
- Lindenhurst
- Lisle
- Little Valley
- Livingston Manor
- Lloyd Harbor
- Lockport
- Locust Valley
- Lorenz Park
- Lowville
- Lynbrook
- Lyncourt
- Lyon Mountain
- Lyons Falls
- La Salle
- Lackawack
- Lacy Corners
- Ladentown
- Ladleton