- La Grange - Zip Codes in La Grange
- La Grange Park - Zip Codes in La Grange Park
- Lake Bluff - Zip Codes in Lake Bluff
- Lake Forest - Zip Codes in Lake Forest
- Lake In The Hills - Zip Codes in Lake In The Hills
- Lake Villa - Zip Codes in Lake Villa
- Lakewood - Zip Codes in Lakewood
- Lake Zurich - Zip Codes in Lake Zurich
- Lansing - Zip Codes in Lansing
- La Salle - Zip Codes in La Salle
- Lawrenceville - Zip Codes in Lawrenceville
- Lebanon - Zip Codes in Lebanon
- Lemont - Zip Codes in Lemont
- Lena - Zip Codes in Lena
- Le Roy - Zip Codes in Le Roy
- Lewistown - Zip Codes in Lewistown
- Libertyville - Zip Codes in Libertyville
- Lincoln - Zip Codes in Lincoln
- Lincolnshire - Zip Codes in Lincolnshire
- Lincolnwood - Zip Codes in Lincolnwood
- Lisle - Zip Codes in Lisle
- Litchfield - Zip Codes in Litchfield
- Lockport - Zip Codes in Lockport
- Lombard - Zip Codes in Lombard
- Loves Park - Zip Codes in Loves Park
- Lyons - Zip Codes in Lyons