| Calcium Activated Chloride Channel | Academic & Science |
| Campaign Against Climate Change | Academic & Science |
| Central Alabama Community College's | Academic & Science |
| Capital Area Career Center | Business |
| Credit Acceptance Corporation | Business |
| Citizens for Alternatives To Chemical Contamination | Chemistry |
| Chin Association for Christian Communication | Community |
| Capital Area Christian Church | Community |
| Chilterns Association of Camera Clubs | Community |
| Crispus Attucks Community Center | Community |
| Chinese American Community Center | Community |
| Central Atlantic Collegiate Conference | Community |
| Croatian American Cultural Center | Community |
| Crispus Attucks Cultural Center's | Community |
| Crispus Attucks Cultural Center | Community |
| Charlotte Apple Computer Club | Computing |
| College Avenue Congregational Church | Educational Institute |
| Central Alabama Community College | Educational Institute |
| Commercial Aircraft Corporation of China | General |
| Chicago Animal Care and Control | General |
| Center for Animal Care and Control | General |
| Cooperative Adaptive Cruise Control | General |
| Central Arkansas Corvette Club | General |
| Capitol Area Corvette Club | General |
| Confederation of Autosport Car Clubs | General |
| Capital Area Cobra Club | General |
| Can-Am Challenge Cup | General |
| Can-Am Car Club | General |
| Club de Autos Clasicos Cusco | General |
| Club de Automoviles Clasicos de Corrientes | General |
| Classic American Car Club | General |
| Cac Anh Cac Chi | General |
| Commander Air Component Command | General |
| Correlated Active Clause Coverage | General |
| Chinese American Cooperation Council | Governmental |
| Communications and Configuration Console | Space Science |
| Chestnut Avenue Cricket Club | Sports |