The following links are for summer 2006, however, most camps are run the same week every year. Hopefully they will update their camp information as the year progresses.
Abersold Jazz Camps - one of the best!
CMSU Music Camp
Community Music School of Webster University Band Camp
Illinois Summer Youth Music
Interlochen (THE Interlochen)
Jefferson College Band Camps (geared more for Middle School Students)
Loyola Jazz Camp
Mizzou Band Camp
School Band and Orchestra Magazine - many camp links!
SEMO Band Camp
SIUE MUSIC CAMPS
SMSU Band Camp
UMSL Jazz Camp
University of Texas Jazz Workshops
Webster Jazz Camp