| CUNY Coalition for Students with Disabilities | Academic & Science |
| Center for Counseling and Student Development | Academic & Science |
| Cambria Community Services District | Community |
| Cherokee Community School District | Community |
| Connoisseur's Club of Smoking and Drinking | Community |
| Center on Conflict Security and Development | Community |
| Cambria Community Service District | Community |
| Chillicothe City School District | Community |
| Central Curry School District | Community |
| Campbell County School District | Community |
| Community Consolidated School District | Community |
| Clarke County School District | Community |
| Carmel Central School District | Community |
| Central Consolidated School District | Community |
| Camden City School District | Community |
| Central Columbia School District | Community |
| Chappaqua Central School District | Community |
| Christian Cooperating School Districts | Community |
| Congregatio Catolica Sine Dogma | Community |
| Clarkstown Central School District | Community |
| Caledonia Centre for Social Development | Community |
| Cherry Creek School District | Community |
| Charleston County School District | Community |
| Calgary Catholic School District | Community |
| Center for Sustainable Suburban Development | Community |
| Clark County School District | Community |
| Canadian Council on Social Development | Community |
| Cobb County School District | Community |
| Common Constraint Situation Display | Computer Hardware |
| Clinical Coding Schedule Development | Computing |
| California College San Diego | Educational Institute |
| Coupled Cluster Singles and Doubles | General |
| Camaro Club of San Diego | General |
| Child Support Services Division | Governmental |
| Complex Carbohydrate Structure Database | Medical |
| Command Communications Service Designator | Military and Defence |
| Coahoma County School District | Regional |
| Cycling Camp San Diego | Sports |
| Cellular Circuit Switched Data | Telecommunication |
