- Salem (Population: 7,909)
- Sandoval (Population: 1,434)
- Sandwich (Population: 6,509)
- Sauk Village (Population: 10,411)
- Savanna (Population: 3,542)
- Savoy (Population: 4,476)
- Schaumburg (Population: 75,386)
- Schiller Park (Population: 11,850)
- Scott AFB (Population: 2,707)
- Seneca (Population: 2,053)
- Sesser (Population: 2,128)
- Shawneetown (Population: 1,410)
- Shelbyville (Population: 4,971)
- Sheldon (Population: 1,232)
- Sheridan (Population: 2,411)
- Sherman (Population: 2,871)
- Shiloh (Population: 7,643)
- Shorewood (Population: 7,686)
- Sidney (Population: 1,062)
- Silvis (Population: 7,269)
- Skokie (Population: 63,348)
- Sleepy Hollow (Population: 3,553)
- Smithton (Population: 2,248)
- Somonauk (Population: 1,295)
- South Barrington (Population: 3,760)
- South Beloit (Population: 5,397)
- South Chicago Heights (Population: 3,970)
- South Elgin (Population: 16,100)
- South Holland (Population: 22,147)
- South Jacksonville (Population: 3,475)
- South Pekin (Population: 1,162)
- South Roxana (Population: 1,888)
- Southern View (Population: 1,695)
- Sparta (Population: 4,486)
- Spring Grove (Population: 3,880)
- Spring Valley (Population: 5,398)
- Springfield (Population: 111,454)
- St. Anne (Population: 1,212)
- St. Charles (Population: 27,896)
- St. Elmo (Population: 1,456)
- St. Joseph (Population: 2,912)
- Staunton (Population: 5,030)
- Steeleville (Population: 2,077)
- Steger (Population: 9,682)
- Sterling (Population: 15,451)
- Stickney (Population: 6,148)
- Stillman Valley (Population: 1,048)
- Stockton (Population: 1,926)
- Stone Park (Population: 5,127)
- Streamwood (Population: 36,407)
- Streator (Population: 14,190)
- Sugar Grove (Population: 3,909)
- Sullivan (Population: 4,326)
- Summit (Population: 10,637)
- Sumner (Population: 1,022)
- Swansea (Population: 10,579)
- Sycamore (Population: 12,020)
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