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Illinois
- Sadorus
- Sailor Springs
- Saint Anne
- Saint Augustine
- Saint Charles
- Saint David
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- Saint Francisville
- Saint Jacob
- Saint Johns
- Saint Joseph
- Saint Libory
- Saint Peter
- Sainte Marie
- Salem
- San Jose
- Sandoval
- Sandwich
- Sauget
- Sauk Village
- Saunemin
- Savanna
- Savoy
- Sawyerville
- Saybrook
- Scales Mound
- Schaumburg
- Schiller Park
- Schram City
- Sciota
- Scottville
- Seaton
- Seatonville
- Secor
- Seneca
- Sesser
- Shabbona
- Shannon
- Shawneetown
- Sheffield
- Shelbyville
- Sheldon
- Sheridan
- Sherman
- Sherrard
- Shiloh
- Shipman
- Shorewood
- Shumway
- Sibley
- Sidell
- Sidney
- Sigel
- Silvis
- Simpson
- Sims
- Skokie
- Sleepy Hollow
- Smithboro
- Smithfield
- Smithton
- Somonauk
- Sorento
- South Barrington
- South Beloit
- South Chicago Heights
- South Elgin
- South Holland
- South Jacksonville
- South Pekin
- South Roxana
- South Wilmington
- Southern View
- Sparland
- Sparta
- Spaulding
- Spillertown
- Spring Bay
- Spring Grove
- Spring Valley
- Springerton
- Springfield
- Standard
- Standard City
- Stanford
- Staunton
- Steeleville
- Steger
- Sterling
- Steward
- Stewardson
- Stickney
- Stillman Valley
- Stockton
- Stone Park
- Stonefort
- Stonington
- Stoy
- Strasburg
- Strawn
- Streamwood
- Streator
- Stronghurst
- Sublette
- Suburban
- Sugar Grove
- Sullivan
- Summerfield
- Summit
- Sumner
- Sun River Terrace
- Swansea
- Sycamore
- Symerton