- Loxa
- Lynn Center
- Leanderville
- Lone Tree
- Lake Siding
- Lementon
- Level Acres
- Liberty
- Long Branch
- Lanesville
- La Grange Park
- La Moille
- La Rose
- Lacon
- Ladd
- Lake Barrington
- Lake Bluff
- Lake Catherine
- Lake in the Hills
- Lake Ka-Ho
- Lake Summerset
- Lake Villa
- Lake Zurich
- Lakemoor
- Lakewood Shores
- L'Erable
- La Hogue
- Leonard
- Lithia
- Lacours Island