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The high schools in the state are organized into four classifications by the size of the student population, identified by 1A, 2A, 3A, & 4A classifications. 4A is made up of the largest schools. The schools are split so that approximately 25% of the schools are in each classification. The classifications are reordered every four years based on updated student population numbers, the next reassignment being for 2013–14.

Team sports have a separate state championship competition and title for each of the classifications. The only exceptions are cases in which the 1A & 2A classifications are combined, or in football, where each classification is separated into a single "A" and double "A" (AA) classification, with the double "A" classification being made up of larger schools than the single "A".

Each classification has a number of conferences for local play. Some conferences have teams from two different classifications

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