Index of Member Schools
— Sacred Heart-Griffin, see Springfield (Sacred Heart-Griffin)St. Anne
— St. Anthony, see Effingham (St. Anthony)
— St. Bede, see Peru (St. Bede)
— St. Benedict, see Chicago (St. Benedict)
St. Charles (East)
St. Charles (North)
— St. Edward, see Elgin (St. Edward)
St. Elmo
— St. Francis, see Wheaton (St. Francis)
— St. Francis de Sales, see Chicago (St. Francis de Sales)
— St. Gregory, see Chicago (St. Gregory)
— St. Ignatius College Prep, see Chicago (St. Ignatius College Prep)
— St. Joseph, see Westchester (St. Joseph)
St. Joseph (S.J.-Ogden)
— St. Laurence, see Burbank (St. Laurence)
— St. Patrick, see Chicago (St. Patrick)
— St. Rita, see Chicago (St. Rita)
— St. Scholastica, see Chicago (St. Scholastica)
— St. Teresa, see Decatur (St. Teresa)
— St. Thomas More, see Champaign (St. Thomas More)
— St. Viator, see Arlington Heights (St. Viator)
Salem
— Sandburg, see Orland Park (Sandburg)
Sandoval
Sandwich
— Sangamon Valley, see Niantic (Sangamon Valley)
Savanna (West Carroll)
Scales Mound
Schaumburg (H.S.)
— Schlarman, see Danville (Schlarman)
— Schurz, see Chicago (Schurz)
Sciota (West Prairie)
Seneca
— Senn, see Chicago (Senn)
Serena
Sesser (S.-Valier)
— Seton Academy, see South Holland (Seton Academy)
— Seymour, see Payson (Seymour)
Shabbona (Indian Creek)
— Shawnee, see Wolf Lake (Shawnee)
Shelbyville
— Shepard, see Palos Heights (Shepard)
Sherrard
— Shiloh, see Hume (Shiloh)
Sidell (Jamaica)
— Simeon, see Chicago (Simeon)
Skokie (Niles North)
Skokie (Niles West)
Skokie (Yeshiva)
Somonauk
— South, see Crystal Lake (South)
— South, see Downers Grove (South)
— South, see Plainfield (South)
South Beloit
— South Central, see Farina (South Central)
South Elgin
— South Fork, see Kincaid (South Fork)
South Holland (Seton Academy)
South Holland (Thornwood)
— South Shore, see Chicago (South Shore)
— Southeast, see Springfield (Southeast)
— Southeastern, see Augusta (Southeastern)
— Southwestern, see Piasa (Southwestern)
Sparta
— Spoon River Valley, see London Mills (Spoon River Valley)
Spring Valley (Hall)
Springfield (Calvary)
Springfield (H.S.)
Springfield (Lanphier)
Springfield (Lutheran)
Springfield (Sacred Heart-Griffin)
Springfield (Southeast)
— Stagg, see Palos Hills (Stagg)
Stanford (Olympia)
— Stark County, see Toulon (Stark County)
Staunton
Steeleville
— Steinmetz, see Chicago (Steinmetz)
Sterling (H.S.)
Sterling (Newman Central Catholic)
— Sterling Christian, see Galt (Sterling Christian)
— Stevenson, see Lincolnshire (Stevenson)
— Stewardson-Strasburg, see Strasburg (Stewardson-S.)
Stillman Valley
Stockton
Strasburg (Stewardson-S.)
Streamwood
Streator (Twp.)
Streator (Woodland)
— Sullivan, see Chicago (Sullivan)
Sullivan
Summit (Argo)
Sycamore
Sycamore (Cornerstone Christian Academy)