| CCHS | Calvary Christian High School 
| Others |
| CCHS | Camden Catholic High School
| Others |
| CCHS | Camden County High School
| Others |
| CCHS | Campbell County High School
| Others |
| CCHS | Canadian Community Health Survey
| Others |
| CCHS | Cape Coral High School
| Others |
| CCHS | Carbondale Community High School
| Others |
| CCHS | Carleton County Historical Society
| Others |
| CCHS | Carmel Catholic High School
| Others |
| CCHS | Carroll County High School
| Others |
| CCHS | Carver Christian High School
| Others |
| CCHS | Cathedral Catholic High School
| Others |
| CCHS | Cathedral City High School
| Others |
| CCHS | Catholic Central High School
| Others |
| CCHS | Central Cabarrus High School
| Others |
| CCHS | Central Catholic High School
| Others |
| CCHS | Central Crossing High School
| Others |
| CCHS | Cesar Chavez High School
| Others |
| CCHS | Champaign County Humane Society
| Others |
| CCHS | Charleston Catholic High School
| Others |
| CCHS | Charlotte Catholic High School
| Others |
| CCHS | Chatsmore Catholic High School
| Others |
| CCHS | Chelmsford County High School
| Others |
| CCHS | Cherry Creek High School
| Others |
| CCHS | Chester County Historical Society
| Others |
| CCHS | Chicago Christian High School
| Others |
| CCHS | Chicopee Comprehensive High School
| Others |
| CCHS | Childrens Care Hospital And School
| Others |
| CCHS | Chilton County High School
| Others |
| CCHS | Christiana Care Health System
| Others |
| CCHS | Christopher Columbus High School
| Others |
| CCHS | Clacton County High School
| Others |
| CCHS | Clark County Humane Society
| Others |
| CCHS | Clarke Central High School
| Others |
| CCHS | Clarke County High School
| Others |
| CCHS | Clay-Chalkville High School
| Others |
| CCHS | Clear Creek High School
| Others |
| CCHS | Coal City High School
| Others |
| CCHS | Codsall Community High School
| Others |
| CCHS | Colchester County High School
| Others |
| CCHS | College and Career High School
| Others |
| CCHS | College of Community Health Sciences
| Others |
| CCHS | Colleton County High School
| Others |
| CCHS | Colquitt County High School
| Others |
| CCHS | Columbia City High School
| Others |
| CCHS | Columbia County Historical Society
| Others |
| CCHS | Columbus Center For Human Services
| Others |
| CCHS | Communitas Charter High School
| Others |
| CCHS | Computerized Criminal History System
| Others |
| CCHS | Concord Carlisle High School
| Others |
| CCHS | Concord-Carlisle High School
| Others |
| CCHS | Congenital central hypoventilation syndrome
| Others |
| CCHS | Congental Central Hypoventilation Syndrome
| Others |
| CCHS | Conley-Caraballo High School
| Others |
| CCHS | Contra Costa
| Others |
| CCHS | Contra Costa Health Services
| Others |
| CCHS | Copper Canyon High School
| Others |
| CCHS | Copper Country Humane Society
| Others |
| CCHS | Copperas Cove High School
| Others |
| CCHS | Corner Canyon High School
| Others |
| CCHS | Corydon Central High School
| Others |
| CCHS | Covenant Christian High School
| Others |
| CCHS | Covington Catholic High School
| Others |
| CCHS | Cross Country Home Services
| Others |
| CCHS | Cross Creek High School
| Others |
| CCHS | Culpeper County High School
| Others |
| CCHS | Culver City High School
| Others |
| CCHS | Culver Community High School
| Others |
| CCHS | Currie Community High School
| Others |
| CCHS | Cypress Creek High School
| Others |