Every Ohio high school.

Circleville High School

Clark Montessori High School

Clay High School

Clay High School

Claymont High School

Clear Fork High School

Clearview High School

Clearview Local Schools

Clermont Northeastern High School

Cleveland Academy for Scholarship Technology and Leadership

Cleveland Early College High

Cleveland Heights High School

Cleveland High School for the Digital Arts

Cleveland Metro Remote School K-12

Cleveland School Of The Arts High School

Cleveland School of Architecture & Design

Cleveland School of Science & Medicine

Cliff Park High School

Clinton-Massie High School

Cloverleaf High School

Clyde High School

Col Crawford High School

Coldwater High School

Colerain High School

College Corner Union Elementary School

Collinwood High School

Columbia High School

Columbian High School

Columbiana High School

Columbus Africentric Early College High School

Columbus Alternative High School

Columbus Arts & Technology Academy

Columbus Grove High School

Columbus International High School

Columbus Online Academy

Columbus Preparatory Academy

Community STE(A)M Academy - Xenia

Conneaut High School

Conotton Valley High School

Constellation Schools: Parma Community

Continental Local High School

Copley High School

Cornerstone Academy Community School

Cory-Rawson High School

Coshocton High School

Coshocton Opportunity School

Coventry High School

Covington High School

Crestline Bulldog Academy