| City College Center for the Arts | Academic & Science |
| Climate Control Companies Association | Academic & Science |
| Canyon Creek Christian Academy | Academic & Science |
| Certified Construction Contract Administrator | Business |
| Consumer Credit Counseling Agency | Business |
| Certification of Clinical Competence Audiology | Business |
| Certified Chiropractic Clinical Assistants | Business |
| Center for Christianity Culture and the Arts | Community |
| Campus Community Coordinators Alliance | Community |
| Colorado County Clerks Association | Community |
| Clay County Christian Academy | Community |
| Conejo Chinese Cultural Association | Community |
| Christian Camp and Conference Association | Community |
| Cavendish Community and Conservation Association | Community |
| Comprehensive Community Corrections Act | Community |
| Clarksville Community Concert Association | Community |
| Crystal City Civic Association | Community |
| CT Child Care Association | Community |
| Certified Construction Contract Administration | General |
| Correlation Consistent Composite Approach | General |
| Classic Car Club of America | General |
| Checker Car Club of America | General |
| Classic Chevy Club of Albuquerque | General |
| Car Club Challenge Association | General |
| Club de Coches Clasicos Americanos | General |
| Close Combat Capabilities Analysis | Governmental |
| Catfish Creek Conservation Authority [Ontario, Canada] | Governmental |
| Cold Creek Conservation Area (King Township, Ontario) | Governmental |
| Columbia County Council on the Arts | Governmental |
| Caroline County Council of Arts | Governmental |
| Central Centrifugal Cicatricial Alopecia | Medical |
| California Contract Cities Association | Regional |
| Canadian Correspondence Chess Association | Regional |
| Canadian Corporate Counsel Association | Regional |