Illinois Neighborhoods S
- Sauganash (3)
- Saukie (1)
- Schorsch Village (5)
- Scots Plains (1)
- Scottsdale (1)
- Signal Hill (6)
- Sinnissippi Park (1)
- Smith Park (29)
- South Deering (3)
- South East Villages (4)
- South End (2)
- South Farnsworth (10)
- South Loop (255)
- South Shore (172)
- South Side (4)
- Southeast Aurora (2)
- Southeast Elgin-Cook (6)
- Southeast Elgin-Kane (3)
- Southwest Elgin (5)
- Southwest Rock Island (2)
- Southwest Rockford (6)
- Spring Brook Golf Course (1)
- Steeple Run (1)
- Still Water (4)
- Streeterville (191)