| College of Computing Engineering and Construction | Academic & Science |
| Coos Curry Electric Cooperative | Academic & Science |
| Carteret Craven Electric Cooperative | Academic & Science |
| Career and Community Engagement Center | Business |
| Chatham Citizens for Effective Communities | Community |
| Chinese Cultural and Education Center | Community |
| Corporate Continuing Education Center | Community |
| Centre for Coastal Environmental Conservation | Community |
| Central Carolinas Emmaus Community | Community |
| Catholic Community Education Commission | Community |
| Community Congress for Economic Change | Community |
| Civic Community Engagement Center | Community |
| Columbia County Education Campus | Community |
| Center for Czech Education and Culture | Community |
| Community Counseling and Education Center | Community |
| Color Country Equestrian Club | Community |
| Community and Civic Engagement Center | Community |
| Council of Community Education Committees | Community |
| Center for Community Engagement and Collaboration | Community |
| Citizens Clean Elections Commission | General |
| Cotton Candy Eco Cloth | General |
| Citizens Clean Election Commission | General |
| Centre for Control of Emerging Contaminants | General |
| Citizens Comfort Embracing Coalition | General |
| Colorado Clean Energy Cluster | Governmental |
| Civic and Community Engagement Center | Governmental |
| California Clean Energy Certification | Governmental |
| Commission on Climatic and Environmental Change | Governmental |
| Canada China Education Council | Governmental |
| Canadian County Education Center | Regional |
| Cass County Electric Cooperative | Regional |
| Coleman County Electric Cooperative | Regional |
| Columbia County Exhibition Center | Regional |
| Chattahoochee County Education Center | Regional |
