Barrios de Illinois S
- Sauganash (2)
- Saukie (1)
- Schorsch Village (4)
- Scots Plains (1)
- Scottsdale (4)
- Sherman Street (1)
- Signal Hill (3)
- Smith Park (33)
- South Chicago (40)
- South Deering (3)
- South East Villages (8)
- South Farnsworth (9)
- South Loop (331)
- South Shore (135)
- South Side (2)
- Southeast Aurora (3)
- Southeast Elgin-Cook (6)
- Southeast Elgin-Kane (5)
- Southwest Elgin (3)
- Southwest Rockford (4)
- Spring Brook Crossing (1)
- Spring Brook Estates (1)
- Spring Brook Golf Course (5)
- St Mary's (1)
- St Pat's (5)
- Steeple Run (1)
- Still Water (10)
- Streeterville (202)