- Larchmont
- Lattingtown
- Lena
- Lentsville
- Lidell Corners
- Lloydsville
- Laurel Hollow
- Livingston Island
- Ludingtonville
- Le Roy
- Laurelton
- Lefrak City
- Linden Hill
- Linden Hill
- Little Neck
- Locust Manor
- Lido Beach
- Lansingburgh
- Lincolnville
- Little Shodack Island
- Luther
- Lincolndale
- Lindenhurst
- Lisle
- Little Valley
- Livingston Manor
- Lloyd Harbor
- Lockport
- Locust Valley
- Lorenz Park