IESA Activities

Class Split

How is the split between classes determined?

A complete list of schools entering a given activity is computer generated.

The report lists the schools from the highest enrollment to the lowest. The enrollment figure that is used is based on a school's 7-8 enrollment. The enrollment figures are received from the Illinois State Board of Education.

Two-Class Activities

The highest fifty percent of the schools entered in the activity are Class AA and the lowest fifty percent become Class A. For example, if there are 250 schools entered in girls softball, then the 125 schools (50%) with the largest 7-8 enrollment become Class AA and the bottom 125 schools become the Class A schools in softball. Since there is no "magic number" at where the cutoff between Class AA and Class A occurs, the actual number for the cut-off will vary from sport to sport and from year to year. It all depends on the enrollment of the schools and the number of schools that enter the activity each year. It is entirely possible that a school is Class A for one activity and Class AA for a different activity. IESA has classification in all athletic activities except boys wrestling.

Three-Class Activities

The highest thirty-three percent of the schools entered in the activity are Class 3A, the next thirty-three percent of the schools entered in the activity are Class 2A, and the lowest thirty-three percent become Class 1A. For example, if there are 300 schools entered in boys baseball, then the 100 schools (33%) with the largest 7-8 enrollment become Class 3A, the 100 schools that fall between the top 33% and the bottom 33% are Class 2A, and the bottom 100 schools become the Class 1A schools in baseball. Since there is no "magic number" at where the cutoff between classes occurs, the actual number for the cut-off will vary from year to year. It all depends on the enrollment of the schools and the number of schools that enter the activity each year. It is entirely possible that a school is Class A for one activity and Class AA for a different activity. IESA has classification in all athletic activities except boys wrestling.

Four-Class Activities

The highest twenty-five percent of the schools entered in the activity are Class 4A, the next twenty-five percent of the schools entered in the activity are Class 3A, the next twenty-five percent of the schools entered in the activity are Class 2A, and the lowest twenty-five percent become Class 1A. For example, if there are 400 schools entered in boys basketball, then the 100 schools (25%) with the largest 7-8 enrollment become Class 4A, the 100 schools that fall between the top 25% and the bottom 50% are Class 3A, the 100 schools that fall between the bottom 25% and the top 50% are Class 2A, and the bottom 100 schools become the Class 1A schools in basketball. Since there is no "magic number" at where the cutoff between classes occurs, the actual number for the cut-off will vary from sport to sport and from year to year. It all depends on the enrollment of the schools and the number of schools that enter the activity each year. It is entirely possible that a school is Class A for one activity and Class AA for a different activity. IESA has classification in all athletic activities except boys wrestling.

NOTE: The split number represents the enrollment at which the break between classes occurs. For example, with a split number of 155, schools with enrollment up to 155 will be in Class A, schools with enrollment of 156 or more will be in Class AA.

IESA Member School Enrollments

IESA Yearly School/Activity Totals
Activity Classes 2011-2012 2012-2013 2013-2014 2014-2015
  Schools Low Mid High Schools Low Mid High Schools Low Mid High Schools Low Mid High
Girls Softball 2 188 166 196 154 199 152 204 153
Boys Baseball 3 272 89 190 271 91 188 263 95 195 269 93 200
Boys & Girls Cross-Country 3 258 287 276 186 438 291 169 436 309 155 418
Girls Basketball 4 373 81 137 262 378 78 139 266 379 75 139 265 389 81 144 283
Boys Basketball 4 413 67 122 255 424 68 126 263 424 66 131 265 430 68 129 266
Boys Wrestling 1 141   143   146   TBD  
Girls Volleyball 4 381 67 122 259 385 69 126 261 385 68 131 260 TBD TBD TBD TBD
Scholastic Bowl 2 375 141 364 147 367 147 347 TBD
Boys & Girls Track 2 509 151 524 158 524 162 TBD TBD
Class divisions for Cross-Country are new as of 2012-2013.


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