Safford high school.
Seneca Valley high school with 12
The Pine Bluff High School Zebras have 21 State Championships in Football.
Washington High School of Sioux Falls, South Dakota has 39 state championships, they won 14 straight from 1952 to 1965
Colleges can compete for conference championships not state
None in football one in baseball
Massillon Tigers! (They've Won An Amazing 22!)
6
Jefferson City High School has won 10 State Championships. Nine of those under legendary Coach Pete Adkins. Adkins has the greatest winning percentage in high school football coaching history (87%). His 41 year coaching record stands at 405-60-4.
According to Wikipedia there has been 5 state championships
Nine
Blue Ridge High School Lakeside AZ 15 Champoinships as of 11/26/11
Madison High School with 18