Enrollments listed are official ones as of September 30, 2009. That is the State Board of Education's official enrollment day for every school in Illinois. We use the school's K-8 figure and do not count the pre-K numbers. For junior highs and middle schools we figure in their feeder schools in order to obtain the K-8 total.
 
These enrollments are used to determine classes for each sport until November of the next year.
 

Girls Basketball  Enrollments  2011
             
Class L
Class M
1 Collinsville 4448   33 Breese 647
2 O'F Fulton 3450   34 Unity Pt. 635
3 O'F Carriel 3400   35 Fairfield 598
4 Marion 2566   36 Christopher 589
5 Triad 2454   37 Red Bud 588
6 Highland 1999   38 Pinckneyville 584
7 Waterloo 1804   39 Nashville 517
8 Herrin 1624   40 Sesser 497
9 Massac County 1542   41 Smithton 493
10 Harrisburg 1484   42 Gallatin Co. 485
11 Olney 1421   43 Z-R 475
12 Mt. Vernon 1411   44 Meridian 472
13 Murphysboro 1355   45 North Clay 467
14 Carterville 1350   46 Hardin Co. 429
15 W. Frankfort 1308   47 Lebanon 419
16 Flora 1279   48 Cobden 413
17 Centralia 1254   49 Egyptian 405
18 Carbondale 1215   50 Goreville 387
19 DuQuoin 1106   51 Wayne C. 387
20 Mt.Carmel 1062   52 Vienna 386
21 Benton 1021   53 Pope Co. 379
22 Salem 921   54 Jonesboro 368
23 Carmi 866   55 Marissa 360
24 Hamilton Co. 796   56 G. Shepherd 350
25 Johnston City 789   57 Sandoval 347
26 Carlyle 782   58 Aviston 347
27 Dupo 772   59 Okawville 338
28 Eldorado 769   60 Woodlawn 318
29 Anna 712   61 Century 300
30 Sparta 702   62 Elverado 312
31 Chester 660   63 Rome 287
32 Trico 653   64 Galatia 286
             
 Class S    Class S
65 All Saints 285   92 New Hope 182
66 Bluford 285   93 Cypress Co-op 181
67 Shawnee 277   94 Opdyke B.R. 180
68 Albers Co-op 273   95 Ashley Co-op 180
69 Steeleville 272   96 RedBud Luth. Co-op 174
70 Giant City 270   97 St.Andrew Co-op 173
71 St.Marys Herrin 269   98 Unity 171
72 Waltonville 269   99 Jefferson 170
73 St. Paul 262   100 Pville 204 165
74 Field 261   101 Jasper 163
75 Germantown 254   102 St.Rose 159
76 DeSoto 250   103 Creal Springs 154
77 Summersville 243   104 Maryville Christian 152
78 N.Simpson Hill 242   105 St. Joe 143
79 Tamaroa Co-op 240   106 Bartelso 142
80 Iuka 238   107 St. Marys MTV 140
81 Raccoon 235   108 Im.Lu.Co-op Ok'v. 139
82 Dodds Co-op 230   109 St.John Chester 133
83 Thompsonville 227   110 Trinity L. Centralia 125
84 Central City 225   111 St.Mark 118
85 Selmaville 219   112 Lick Creek 114
86 Dongola 207   113 St.Mary's MTC 112
87 Joppa 205   114 St. Ann 91
88 Bethel Co-op 205   115 RB Catholic 85
89 Unity Christian 201   116 St.Libory 83
90 Odin 194   117 Trinity L. Hoffman 77
91 Hoyleton Co-op 182   118 Farrington 53