TEAI Region 1 Boone County ● Belvidere High School, Belvidere ​ ​ ● Belvidere North High School, Belvidere ​ ​ ● North Boone High School, Poplar Grove ​ ​ Bureau County ● Bureau Valley High School, Manlius ​ ​ ● DePue High School, DePue ​ ​ ● Hall High School, Spring Valley ​ ​ ● La Moille High School, La Moille ​ ​ ● Ohio High School, Ohio ​ ​ ● Princeton High School, Princeton ​ ​ Carroll County ● Eastland High School, Lanark ​ ​ ● Milledgeville High School, Milledgeville ​ ​ ● West Carroll High School, Savanna ​ ​ Henry County ● AlWood High School, Woodhull ​ ​ ● Annawan High School, Annawan ​ ​ ● Cambridge High School, Cambridge ​ ​ ● Galva High School, Galva ​ ​ ● Geneseo High School, Geneseo ​ ​ ● Kewanee High School, Kewanee ​ ​ ● Orion High School, Orion ​ ​ ● Wethersfield High School, Kewanee ​ ​ Jo Daviess County ● East Dubuque High School, East Dubuque ​ ​ ● Galena High School, Galena ​ ​ ● River Ridge High School, Hanover ​ ​ ● Scales Mound High School, Scales Mound ​ ​ ● Stockton High School, Stockton ​ ​ ● Warren High School, Warren ​ ​ LaSalle County ● Earlville High School, Earlville ​ ​ ● LaSalle-Peru High School, LaSalle ​ ​ ● Leland High School, Leland ​ ​ ● Marquette High School, Ottawa ​ ​ ● Mendota Township High School, Mendota ​ ​ ● Ottawa Township High School, Ottawa ​ ​ ● St. Bede Academy, Peru ​ ​ ● Seneca High School, Seneca ​ ​ ● Serena High School, Serena ​ ​ ● Streator Township High School, Streator ​ ​ Lee County ● Amboy High School, Amboy ​ ​ ● Ashton-Franklin Center High School, Ashton ​ ​ ● Dixon High School, Dixon ​ ​ ● Paw Paw High School, Paw Paw ​ ​ Ogle County ● Byron High School, Byron ​ ​ ● Forreston High School, Forreston ​ ​ ● Oregon High School, Oregon ​ ​ ● Polo Community High School, Polo ​ ​ ● Rochelle Township High School, Rochelle ​ ​ ● Stillman Valley High School, Stillman Valley ​ ​ Rock Island County ● Alleman High School, Rock Island ​ ​ ● Moline High School, Moline ​ ​ ● Riverdale High School, Port Byron ​ ​ ● Rock Island High School, Rock Island ​ ​ ● Rockridge High School, Taylor Ridge ​ ​ ● Sherrard High School, Sherrard (also serves students in Mercer County) ​ ​ ​ ● United Township High School, East Moline ​ ​ Stark County ● Stark County High School, Toulon ​ ​ Stephenson County ● Aquin Central Catholic High School, Freeport ​ ​ ● Dakota Junior Senior High School, Dakota ​ ​ ● Freeport High School, Freeport ​ ​ ● Lena-Winslow High School, Lena ​ ​ ● Orangeville High School, Orangeville ​ ​ ● Pearl City High School, Pearl City ​ ​ Whiteside County ● Erie High School, Erie ​ ​ ● Fulton High School, Fulton ​ ​ ● Morrison High School, Morrison ​ ​ ● Newman Central Catholic High School, Sterling ​ ​ ● Prophetstown High School, Prophetstown ​ ​ ● Rock Falls High School, Rock Falls ​ ​ ● Sterling High School, Sterling ​ ​ ● Unity Christian High School, Fulton ​ ​ Winnebago County ● Auburn High School, Rockford ​ ​ ● Boylan Catholic High School, Rockford ​ ​ ● Christian Life High School, Rockford ​ ​ ● Durand High School, Durand ​ ​ ● Guilford High School, Rockford ​ ​ ● Harlem High School, Machesney Park ​ ​ ● Hononegah Community High School, Rockton ​ ​ ● Thomas Jefferson High School, Rockford ​ ​ ● Keith Country Day School, Rockford ​ ​ ● Our Lady of the Sacred Heart Academy, Rockford ​ ​ ● Pecatonica High School, Pecatonica ​ ​ ● Rockford Christian High School, Rockford ​ ​ ● Rockford East High School, Rockford ​ ​ ● Rockford Iqra School, Rockford ​ ​ ● Rockford Lutheran High School, Rockford ​ ​ ● South Beloit High School, South Beloit ​ ​ ● Winnebago High School, Winnebago ​ ​ .