Place
- Illinois--Somonauk1
- Illinois--Sorento1
- Illinois--South Wilmington1
- Illinois--Sparta1
- Illinois--Standard1
- Illinois--Stockton1
- Illinois--Stonington1
- Illinois--Stronghurst1
- Illinois--Table Grove1
- Illinois--Tampico1
- Illinois--Taylor Springs1
- Illinois--Teutopolis1
- Illinois--Tiskilwa1
- Illinois--Tolono1
- Illinois--Toluca1
- Illinois--Tremont1
- Illinois--Trenton1
- Illinois--Troy1
- Illinois--Ullin1
- Illinois--Utica1