| Center for the Economics and Demography of Aging | Academic & Science |
| Center on the Economics and Demography of Aging | Academic & Science |
| Cooperative Economic Development Agreement | Business |
| Council of Entomology Department Administrators | Business |
| Civil Emergency and Defense Agency | Business |
| Civil Emergency Defense Agency | Business |
| Churchill Economic Development Authority | Community |
| Community and Economic Development Association | Community |
| Cornwall Eating Disorders Association | Community |
| Clearwater Economic Development Association | Community |
| Cayuga Economic Development Agency | Community |
| Chester Economic Development Authority | Community |
| California Enterprise Development Authority | Community |
| Caribbean Export Development Agency | Community |
| Community and Economic Development Agency | Community |
| Cullman Economic Development Agency | Community |
| Catering Equipment Distributors Association | Community |
| Choctaw Economic Development Authority | Community |
| Community Economic Development Awards | Community |
| Citizen Entrepreneurial Development Agency | Community |
| Community and Economic Development Associates | Community |
| Cleveland Educational Design Alliance | Community |
| Cross Examination Debate Assocation | General |
| Cross Environment Data Access | General |
| California Elections Data Archive | General |
| CICS Execution Dynamic Allocation | General |
| Centro Ecuatoriano de Derecho Ambiental | General |
| Council on Electronic Design Automation | Governmental |
| Comprehensive Environmental Data Archive | Governmental |
| Centre for Environmental Data Analysis | Governmental |
| Committee for Economic Development of Australia | Regional |
| Cross Examination Debate Association | Sports |