Place
- Illinois--Kane1
- Illinois--Keysport1
- Illinois--Kincaid1
- Illinois--Kingston1
- Illinois--Knox County1
- Illinois--La Harpe1
- Illinois--La Moille1
- Illinois--La Salle County1
- Illinois--Lake Bluff1
- Illinois--Livingston1
- Illinois--Loami1
- Illinois--Loda1
- Illinois--Logan County1
- Illinois--London Mills1
- Illinois--Lostant1
- Illinois--Madison County1
- Illinois--Manito1
- Illinois--Manteno1
- Illinois--Middletown1
- Illinois--Mundelein1