Enrollments listed are official ones as of September 30, 2015. 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.
| 2016 Boys Basketball Enrollments | ||||
|---|---|---|---|---|
| Class L | Class M | |||
| Collinsville | 4380 | Breese | 625 | |
| Carriel-O'Fallon | 2902 | Unity Point | 618 | |
| Fulton-O'Fallon | 2742 | Trico | 608 | |
| Mascoutah | 2500 | Fairfield | 607 | |
| Marion | 2498 | Chester | 601 | |
| Triad | 2442 | Red Bud | 575 | |
| Highland | 1877 | Christopher | 552 | |
| Waterloo | 1749 | Gallatin County | 545 | |
| Herrin | 1650 | Nashville | 529 | |
| Carterville | 1534 | Pinckneyville | 526 | |
| Olney-Richland Co. | 1513 | Smithton | 512 | |
| Massac Co. | 1506 | Norris City OE | 467 | |
| Harrisburg | 1456 | Lebanon | 455 | |
| Mt.Vernon-Casey | 1411 | Albion | 444 | |
| Carbondale | 1398 | Sesser-Valier | 426 | |
| Murphysboro | 1398 | Zeigler-Royalton | 418 | |
| Centralia | 1260 | North Clay | 410 | |
| West Frankfort | 1187 | South Central | 409 | |
| Benton | 1106 | Hardin County | 397 | |
| DuQuoin | 996 | Vienna | 393 | |
| Carmi | 984 | Jonesboro | 386 | |
| Salem-Franklin Park | 956 | Marissa | 385 | |
| Mt.Carmel | 973 | Okawville | 365 | |
| Flora | 883 | Wayne City | 354 | |
| Wesclin | 867 | Goreville | 352 | |
| Hamilton County | 832 | Aviston | 347 | |
| Millstadt | 786 | Cobden | 344 | |
| Eldorado | 768 | New Athens | 340 | |
| Carlyle | 747 | Crab Orchard | 339 | |
| Johnston City | 719 | Meridian | 336 | |
| Sparta | 709 | Pope County | 333 | |
| Anna | 679 | Rome | 326 | |
| *Egyptian goes to Class S | 326 | |||
| Class S | ||||
| Woodlawn | 312 | Ewing | 181 | |
| Valmeyer | 302 | St.JohnLu.-RB | 181 | |
| Cairo | 294 | Cypress/Buncomb Co-op | 175 | |
| Sandoval | 293 | Opdyke | 174 | |
| Carrier Mills-Stone Fort | 287 | Kell/Farrington Co-op | 174 | |
| Galatia | 286 | West Salem | 171 | |
| Central City | 280 | New Hope | 170 | |
| Steeleville | 280 | Jasper | 165 | |
| Albers-Damiansville Co-op | 277 | Patoka | 164 | |
| Century | 276 | Willow Grove | 164 | |
| Cisne | 275 | UnityCh.-ENERGY | 158 | |
| Elverado | 268 | Tr.Lu.Hoyleton/G.Pr. Co-op | 158 | |
| Bluford | 259 | Prairie duRocher | 156 | |
| Good Shepherd | 258 | St.Rose | 151 | |
| Field | 257 | St.John Lutheran-Chester | 150 | |
| Creal Springs | 256 | Bartelso | 147 | |
| Summersville | 253 | Evansville | 147 | |
| OLMC-Herrin | 253 | Altamont Lutheran | 146 | |
| Spring Garden | 245 | TSJ-Nville/Im.Lu.-OK Co-op | 142 | |
| All Saints Academy-Breese | 244 | Pinckneyville #204 | 141 | |
| Selmaville | 243 | Coulterville | 136 | |
| Holy Trinity-Fairview Hts. | 240 | Trinity Lutheran-Centralia | 127 | |
| Waltonville | 238 | Ashley | 126 | |
| St.Bruno-Tamaroa Co-op | 236 | Allendale | 122 | |
| Germantown | 235 | New Hebron | 122 | |
| Bethel-McClellan Co-op | 227 | St.Mary/VCA-MTV Co-op | 119 | |
| St.Boniface | 226 | St.Marys Cath.-Mt.Carmel | 118 | |
| Clay City | 221 | Lick Creek | 117 | |
| Shawnee | 221 | Geff | 109 | |
| Raccoon | 220 | New Horizon | 105 | |
| Thompsonville | 217 | St.Mark's Luth.-Steeleville | 89 | |
| New Simpson Hill | 216 | St.Ther./ACA-Salem Co-op | 89 | |
| DeSoto | 211 | St.Mary's Catholic-Chester | 84 | |
| Giant City | 211 | St.Libory | 82 | |
| Odin | 209 | St.Ann Catholic-Nashville | 80 | |
| St.Joseph Catholic-Olney | 208 | Akin | 78 | |
| Irvington/N.Wamac co-op | 206 | Oakdale | 77 | |
| Grayville | 204 | St.Marys Catholic-Centralia | 76 | |
| St.Andrew-M'Boro Co-op | 203 | St.John Catholic-WF | 74 | |
| Joppa Maple Grove | 192 | St.John Catholic-Red Bud | 67 | |
| St.Paul Catholic-Highland | 190 | Trinity Lutheran-Hoffman | 65 | |
| Iuka | 187 | St.Peter | 61 | |
| Dongola | 183 | |||
