- La Grange (Population: 15,608)
- La Grange Park (Population: 13,295)
- La Harpe (Population: 1,385)
- La Salle (Population: 9,796)
- Lacon (Population: 1,979)
- Ladd (Population: 1,313)
- Lake Barrington (Population: 4,757)
- Lake Bluff (Population: 6,056)
- Lake Catherine (Population: 1,490)
- Lake Forest (Population: 20,059)
- Lake in the Hills (Population: 23,152)
- Lake of the Woods (Population: 3,026)
- Lake Summerset (Population: 2,061)
- Lake Villa (Population: 5,864)
- Lake Zurich (Population: 18,104)
- Lakemoor (Population: 2,788)
- Lakewood (Population: 2,337)
- Lakewood Shores (Population: 1,487)
- Lanark (Population: 1,584)
- Lansing (Population: 28,332)
- Lawrenceville (Population: 4,745)
- Le Roy (Population: 3,332)
- Lebanon (Population: 3,523)
- Leland Grove (Population: 1,592)
- Lemont (Population: 13,098)
- Lena (Population: 2,887)
- Lewistown (Population: 2,522)
- Lexington (Population: 1,912)
- Libertyville (Population: 20,742)
- Lincoln (Population: 15,369)
- Lincolnshire (Population: 6,108)
- Lincolnwood (Population: 12,359)
- Lindenhurst (Population: 12,539)
- Lisle (Population: 21,182)
- Litchfield (Population: 6,815)
- Lockport (Population: 15,191)
- Lombard (Population: 42,322)
- Long Creek (Population: 1,364)
- Long Grove (Population: 6,735)
- Long Lake (Population: 3,356)
- Louisville (Population: 1,242)
- Loves Park (Population: 20,044)
- Lovington (Population: 1,222)
- Lynwood (Population: 7,377)
- Lyons (Population: 10,255)
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