- L'Erable
- La Clede
- La Crosse
- La Fox
- La Grange
- LaGrange
- La Grange Island
- La Grange Island
- La Grange Park
- La Harpe
- La Hogue
- La Moille
- LaPlace
- La Prairie
- La Rose
- La Rue
- La Salceda Subdivision
- LaSalle
- La Vingnes Acres
- Lace
- Lacon
- Lacours Island
- Ladd
- Lafayette
- Lake
- Lake Barrington
- Lake Bluff
- Lake Camelot
- Lake Catherine
- Lake Charlotte