DIAA classifies all schools into Division I that have a DOE certified enrollment count for grades 9 through 12 equal to or greater than the school with the smallest enrollment in either the Blue Hen Conference Flight A or the Henlopen Conference North. That number for the 2019-2020 and 2020-2021 school years is 1045. This count consists of all students who, if eligible, would participate at that school, including special needs students. Single gender schools have their total enrollment doubled to determine their final enrollment number. All other schools are classified as Division II.
DIAA conducts State Championships for Division I and Division II in the following sports: football, boys’ and girls’ cross country, dual team wrestling, boys’ and girls’ outdoor track, boys’ soccer, girls’ soccer and field hockey.