Locations in Illinois
- Karbers Ridge
- Karnak
- Kaskaskia
- Keenes
- Keensburg
- Keithsburg
- Kell
- Kempton
- Kenilworth
- Kenney
- Kewanee
- Keyesport
- Kilbourne
- Kildeer
- Kincaid
- Kinderhook
- Kingston
- Kingston Mines
- Kinmundy
- Kinsman
- Kirkland
- Kirkwood
- Knoxville
- La Fayette
- La Grange
- La Grange Park
- La Harpe
- La Moille
- La Prairie
- La Rose
- Lacon
- Ladd
- Lake Barrington
- Lake Bluff
- Lake Forest
- Lake in the Hills
- Lake Ka-ho
- Lake Villa
- Lake Zurich
- Lakemoor
- Lanark
- Lansing
- LaSalle
- Latham
- Lawrenceville
- Le Roy
- Leaf River
- Lebanon
- Lee
- Leland
- Leland Grove
- Lemont
- Lena
- Lenzburg
- Leonore
- Lerna
- Lewistown
- Lexington
- Liberty
- Libertyville
- Lily Lake
- Lima
- Limestone
- Lincoln
- Lincolnshire
- Lincolnwood
- Lindenhurst
- Lisbon
- Lisle
- Litchfield
- Little York
- Littleton
- Liverpool
- Livingston
- Loami
- Lockport
- Loda
- Lomax
- Lombard
- London Mills
- Long Creek
- Long Grove
- Long Point
- Longview
- Loraine
- Lostant
- Louisville
- Loves Park
- Lovington
- Ludlow
- Lyndon
- Lynnville
- Lynwood
- Lyons
- Macedonia
- Machesney Park
- Mackinaw
- Macomb
- Macon
- Madison
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