The PIAA released classification enrollment parameters for all sports in the 2020-21 and 2021-22 school years.
| SCHOOL | BOYS | GIRLS | FOOTBALL | BOYS BASKETBALL | GIRLS BASKETBALL |
|---|---|---|---|---|---|
| North Allegheny | 1063 | 998 | 6A | 6A | 6A |
| Seneca Valley | 882 | 904 | 6A | 6A | 6A |
| Butler | 797 | 724 | 6A | 6A | 6A |
| Canon-McMillan | 695 | 639 | 6A | 6A | 6A |
| Hempfield | 686 | 645 | 6A | 6A | 6A |
| Mt. Lebanon | 651 | 714 | 6A | 6A | 6A |
| Norwin | 620 | 583 | 6A | 6A | 6A |
| Central Catholic | 617 | NT | 6A | 6A | NT |
| Baldwin | 586 | 531 | 6A | 6A | 6A |
| Pine-Richland | 571 | 540 | 5A | 6A | 6A |
| Upper St. Clair | 537 | 491 | 5A | 6A | 6A |
| Peters Township | 523 | 518 | 5A | 6A | 6A |
| Fox Chapel | 522 | 472 | 5A | 6A | 5A |
| Bethel Park | 518 | 520 | 5A | 6A | 6A |
| Penn-Trafford | 517 | 478 | 5A | 6A | 6A |
| Latrobe | 499 | 471 | 5A | 5A | 5A |
| North Hills | 497 | 491 | 5A | *6A | 6A |
| Connellsville | 494 | 439 | 5A | 5A | 5A |
| Shaler | 487 | 490 | 5A | 5A | 6A |
| Kiski Area | 454 | 412 | 5A | 5A | 5A |
| Moon | 441 | 454 | 5A | 5A | 5A |
| South Fayette | 440 | 368 | 5A | 5A | 5A |
| Franklin Regional | 430 | 419 | 5A | 5A | 5A |
| Gateway | 430 | 426 | 5A | 5A | 5A |
| Penn Hills | 421 | 403 | 5A | 5A | 5A |
| Woodland Hills | 413 | 370 | 5A | 5A | 5A |
| West Allegheny | 407 | 368 | 5A | 5A | 5A |
| Oakland Catholic | NT | 406 | NT | NT | 5A |
| Plum | 395 | 379 | 4A | 5A | 5A |
| Armstrong | 391 | 375 | 4A | 5A | 5A |
| Trinity | 390 | 394 | 4A | 5A | 5A |
| Chartiers Valley | 386 | 353 | 4A | 5A | 5A |
| Albert Gallatin | 382 | 348 | 4A | 5A | 5A |
| Mars | 355 | 400 | 4A | 5A | 5A |
| McKeesport | 353 | 316 | 4A | 5A | 5A |
| Hampton | 350 | 381 | 4A | 5A | 5A |
| Thomas Jefferson | 347 | 350 | 4A | 5A | 5A |
| Indiana | 344 | 335 | 4A | 5A | 5A |
| Laurel Highlands | 335 | 328 | 4A | 5A | 5A |
| Ringgold | 320 | 305 | 4A | 5A | 5A |
| New Castle | 319 | 286 | 4A | 5A | 4A |
| Highlands | 313 | 260 | 4A | 5A | 4A |
| West Mifflin | 310 | 253 | 4A | 5A | 4A |
| Greensburg Salem | 305 | 310 | 4A | *6A | 5A |
| Belle Vernon | 304 | 295 | 4A | 4A | 4A |
| Beaver | 303 | 245 | 4A | 4A | 4A |
| Uniontown | 303 | 312 | 4A | 4A | 5A |
| Montour | 297 | 300 | 4A | 4A | 4A |
| Knoch | 283 | 275 | 4A | 4A | 4A |
| Freeport | 273 | 243 | 3A | 4A | 4A |
| Blackhawk | 272 | 286 | 3A | 4A | 4A |
| Central Valley | 271 | 270 | 3A | 4A | 4A |
| Elizabeth Forward | 265 | 256 | 3A | 4A | 4A |
| Ambridge | 254 | 248 | 3A | 4A | 4A |
| Quaker Valley | 252 | 229 | 3A | 4A | 4A |
| North Catholic | 247 | 193 | 3A | 4A | 3A |
| Burrell | 241 | 233 | 3A | 4A | 4A |
| Yough | 234 | 233 | 3A | 4A | 4A |
| Deer Lakes | 230 | 221 | 3A | 4A | 4A |
| South Park | 219 | 204 | 3A | 4A | 3A |
| Southmoreland | 215 | 227 | 3A | 4A | 4A |
| Derry | 214 | 221 | 3A | 4A | 4A |
| Hopewell | 214 | 240 | 3A | 4A | 4A |
| Keystone Oaks | 213 | 198 | 3A | 4A | 3A |
| Mount Pleasant | 211 | 228 | 3A | 4A | 4A |
| Valley | 209 | 208 | 3A | 3A | 4A |
| East Allegheny | 206 | 181 | 3A | 3A | 3A |
| Avonworth | 205 | 166 | 3A | 3A | 3A |
| South Allegheny | 204 | 180 | 3A | 3A | 3A |
| Brownsville | 203 | 197 | 3A | 3A | 3A |
| McGuffey | 190 | 181 | 2A | 3A | 3A |
| Beaver Falls | 186 | 177 | 2A | 3A | 3A |
| Freedom | 181 | 160 | 2A | 3A | 3A |
| Charleroi | 180 | 160 | 2A | 3A | 3A |
| Mohawk | 178 | 152 | 2A | 3A | 3A |
| Ellwood City | 172 | 187 | 2A | 3A | 3A |
| New Brighton | 170 | 140 | 2A | 3A | 2A |
| Waynesburg | 169 | 177 | 2A | 3A | 3A |
| Steel Valley | 169 | 151 | 2A | 3A | 3A |
| Shady Side Academy | 166 | 166 | 2A | 3A | 3A |
| Neshannock | 162 | 140 | 2A | 3A | 2A |
| Riverside | 161 | 158 | 2A | 3A | 3A |
| Apollo-Ridge | 158 | 117 | 2A | 3A | 2A |
| Washington | 157 | 155 | 2A | 3A | 3A |
| Summit Academy | 153 | NT | 2A | 3A | 3A |
| Beth-Center | 147 | 122 | 2A | 3A | 2A |
| Seton LaSalle | 147 | 141 | 2A | 3A | 2A |
| Brentwood | 145 | 150 | 2A | 3A | 3A |
| Lincoln Park | 143 | 357 | NT | 3A | 5A |
| Laurel | 142 | 146 | 2A | 3A | 3A |
| Frazier | 140 | 125 | 2A | 2A | 2A |
| Carlynton | 139 | 125 | 2A | 2A | 2A |
| South Side Beaver | 136 | 107 | 2A | 2A | 2A |
| Chartiers-Houston | 135 | 134 | 2A | 2A | 2A |
| Sto-Rox | 130 | 115 | 2A | 2A | 2A |
| Propel Braddock Hills | 127 | 117 | NT | 2A | 2A |
| Shenango | 126 | 127 | 1A | 2A | 2A |
| Northgate | 120 | 106 | 1A | 2A | 2A |
| Serra | 119 | 116 | *2A | 2A | 2A |
| Aliquippa | 117 | 111 | *3A | *3A | 2A |
| Carmichaels | 114 | 127 | 1A | 2A | 2A |
| Burgettstown | 113 | 125 | 1A | 2A | 2A |
| Jeannette | 113 | 109 | 1A | 2A | 2A |
| Fort Cherry | 111 | 110 | 1A | 2A | 2A |
| Bentworth | 109 | 142 | 1A | 2A | 3A |
| California | 109 | 108 | 1A | 2A | 2A |
| Springdale | 107 | 96 | 1A | 2A | 2A |
| Winchester Thurston | 107 | 95 | NT | 2A | 2A |
| Sewickley Academy | 104 | 102 | NT | 2A | 2A |
| O.L.S.H. | 101 | 116 | 1A | 2A | 2A |
| Greensburg C.C. | 96 | 95 | 1A | 2A | 2A |
| Riverview | 94 | 91 | 1A | 2A | 1A |
| Monessen | 94 | 89 | 1A | 2A | 1A |
| Jefferson-Morgan | 93 | 72 | 1A | 2A | 1A |
| Clairton | 87 | 77 | 1A | *2A | 1A |
| Nazareth Prep | 87 | NT | NT | 1A | 1A |
| Propel Montour | 81 | NT | NT | 1A | NT |
| Union | 81 | 60 | 1A | 1A | 1A |
| West Greene | 79 | 74 | 1A | 1A | 1A |
| Western Beaver | 77 | NA | 1A | 1A | NT |
| Rochester | 72 | 72 | 1A | 1A | 1A |
| Leechburg | 71 | 70 | 1A | 1A | 1A |
| Bishop Canevin | 68 | 77 | 1A | 1A | 1A |
| Eden Christian | 68 | 88 | NT | 1A | 1A |
| Propel Andrew Street | 68 | 76 | NT | 1A | 1A |
| Avella | 67 | 68 | 1A | 1A | 1A |
| Mapletown | 64 | 66 | 1A | 1A | 1A |
| Cornell | 60 | 73 | 1A | 1A | 1A |
| St. Joseph | 49 | 50 | NT | 1A | 1A |
| Vincentian | 45 | 59 | 1A | 1A | 1A |
| Quigley | 44 | 30 | NT | 1A | 1A |
| Imani Christian | 32 | NA | 1A | 1A | NT |
| Geibel | 26 | 36 | NT | 1A | 1A |
| Aquinas Academy | NA | 49 | NT | 1A | 1A |
| Allderdice | 609 | 560 | 6A (City League) | 6A (City League) | 6A (City League) |
| Brashear | 497 | 433 | 5A (City League) | 5A (City League) | 5A (City League) |
| Carrick | 339 | 274 | 4A (City League) | 5A (City League) | 4A (City League) |
| University Prep | 302 | NA | 4A (City League) | NT | NT |
| Obama | 295 | 374 | NT | 4A (City League) | NA |
| Westinghouse | 191 | 187 | 2A (City League) | 3A (City League) | 5A (City League) |
| Perry | 165 | 168 | 2A (City League) | 3A (City League) | 3A (City League) |