East Grand Rapids High School in Grand Rapids, MI as of November 2010 has 115 State Championships.
Southwood
Not positive but many say Cleveland Saint Ignatius. Edit: Definitely Cleveland St. Ignatius for the state of Ohio, they have 10 (all under head coach Chuck Kyle) while the next closest team is...
Tucson High School, of Tucson, Arizona. They hold 29 state baseball titles.
Sutton High Sports College, St Helens, Merseyside, England
High School Basketball Foul Video Goes Viral
Raised Arm Touchdown Penalty Costs High School Championship Title
Teen Fakes Pregnancy for High School Project
Mystery Illness at US High School