Barrios de Illinois S
- Sauganash (1)
- Saukie (2)
- Schorsch Village (5)
- Scots Plains (1)
- Scottsdale (1)
- Sherman Street (1)
- Signal Hill (3)
- Signal Point (1)
- Smith Park (26)
- South Chicago (41)
- South Deering (4)
- South East Villages (7)
- South End (2)
- South Farnsworth (8)
- South Loop (279)
- South Shore (150)
- South Side (3)
- Southeast Aurora (8)
- Southeast Elgin-Cook (4)
- Southeast Elgin-Kane (1)
- Southwest Elgin (1)
- Southwest Rock Island (2)
- Southwest Rockford (7)
- Spring Brook Crossing (1)
- Spring Brook Golf Course (2)
- St Pat's (6)
- Steeple Run (1)
- Still Water (8)
- Streeterville (258)