New Trier
According to Wikipedia there has been 5 state championships
Safford high school.
Madison High School with 18
Washington High School of Sioux Falls, South Dakota has 39 state championships, they won 14 straight from 1952 to 1965
Seneca Valley high school with 12
The Pine Bluff High School Zebras have 21 State Championships in Football.
Highland Park Highschool in ILlinois
no
East Grand Rapids Pioneers
Colleges can compete for conference championships not state
i was wondering aswell
Mount Saint Charles Academy in Woonsocket, Rhode Island has won 26 High School State Championships in a row for boys ice hockey (1978–2003).