Sectional and Super-Sectional hosts are listed further down this page.

1999-2000 Class A Girls Basketball Regional Sitess
Alexis
Armstrong
Arthur
Aurora (A. Christian)
Biggsville (Union)
Braidwood (Reed Custer)
Breese (Mater Dei)
Bridgeport (Red Hill)
Carthage
Casey (C.-Westfield)
Cerro Gordo
Chester
Chicago (Holy Trinity)
Chicago (St. Benedict)
Chicago (St. Francis de Sales)
Chicago (St. Gregory)
Clifton (Central)
Dallas City
Downs (Tri-Valley)
Dupo
Eldorado
Elmhurst (Timothy Christian)
Fairbury (Prairie Central)
Genoa (G.-Kingston)
Goreville
Granville (Putnam County)
Herrin
Hume (Shiloh)
Kewanee (Wethersfield)
Lanark (Eastland)
Lewistown
Litchfield
Madison
Manteno
McLeansboro
Mendon (Unity)
New Athens
Orangeville
Oregon
Pana
Peoria Heights
Peru (St. Bede)
Pittsfield
Pleasant Plains
Port Byron (Riverdale)
Roanoke (R.-Benson)
Rockford (Lutheran)
Rushville
Sandwich
Sherrard
Sidell (Jamaica)
Staunton
Sterling (Newman Central Catholic)
Stockton
Streator (Woodland)
Teutopolis
Tolono (Unity)
Tremont
West Chicago (Wheaton Academy)
Williamsville
Winchester
Wolf Lake (Shawnee)
Woodlawn
Woodstock (Marian)

1999-2000 Class A Girls Basketball Sectional Sites
Abingdon
Arcola
Carrollton
Dwight
Forreston
Greenville
Lansing (Illiana Christian)
Macomb
Manlius (Bureau Valley)
Paxton (P.-Buckley-Loda)
Robinson
Rochester
Sparta
Stillman Valley
West Frankfort (Frankfort)
Yorkville

1999-2000 Class A Girls Basketball Super-Sectional Sites
Bloomington (Illinois Wesleyan University)
Bushnell (B.-Prairie City)
Byron
Carlinville
Decatur (Millikin University)
Nashville
Plano
Seneca