Barrios de Illinois S
- Sauganash (2)
- Scots Plains (1)
- Scottsdale (3)
- Signal Hill (3)
- Signal Point (1)
- Skokie (68)
- Smith Park (26)
- South Deering (3)
- South East Villages (3)
- South End (1)
- South Farnsworth (7)
- South Loop (417)
- South Shore (121)
- South Side (5)
- Southeast Aurora (4)
- Southeast Elgin-Cook (4)
- Southeast Elgin-Kane (2)
- Southwest Elgin (7)
- Southwest Rock Island (1)
- Southwest Rockford (10)
- Spring Brook Crossing (2)
- Spring Brook Golf Course (2)
- Stephens Park (1)
- Still Water (6)
- Streeterville (284)
- Sunset Park (1)