Place
- Itasca, Illinois3
- Justice, Illinois3
- Kenilworth, Illinois3
- Kildeer, Illinois3
- Knollwood, Illinois3
- La Grange Park, Illinois3
- La Grange, Illinois3
- Lake Barrington, Illinois3
- Lake Bluff, Illinois3
- Lake County, Illinois3
- Lake Forest, Illinois3
- Lake Zurich, Illinois3
- Lemont, Illinois3
- Libertyville, Illinois3
- Lincolnshire, Illinois3
- Lincolnwood, Illinois3
- Lisle, Illinois3
- Lockport Heights, Illinois3
- Lockport, Illinois3
- Lombard, Illinois3