| Clinical Translational Research Centers | Academic & Science |
| Cooling Technologies Research Center | Academic & Science |
| Clinical Translational Research Center | Academic & Science |
| Caribbean Tourism Research Centre | Academic & Science |
| Cooling Technology Research Center | Academic & Science |
| Cellular Translational Research Core | Academic & Science |
| Carnegie Tech Radio Club | Academic & Science |
| Cancer Therapy and Research Center at the University of Texas | Academic & Science |
| Campus Technology Resource Center | Academic & Science |
| Clinical and Translational Research Center | Academic & Science |
| Canada Technology and Research Centre | Academic & Science |
| Curriculum Technology Resource Center | Academic & Science |
| Career Transfer Resource Center | Business |
| Caribbean Trade Reference Centre | Business |
| Canada Truck Reefer Container Service, LTD. | Business |
| Computing Tabulating Recording Company | Business |
| Community Treatment and Recovery Center | Community |
| Counter Terrorists and Reactionaries Committee | Community |
| Colorado Therapeutic Riding Center | Community |
| Cyber Terror Response Center | Computing |
| Cisco Transaction Connection | Computing |
| Computer TRansCeiver | Computing |
| Currency Transaction Report for Casinos | General |
| California Telehealth Resource Center | General |
| Canada Truck Reefer Container Service | General |
| Charters Towers Restorers Club | General |
| Cooper Tire and Rubber Company | General |
| Communications Technician (collection) Chief Petty Officer | Governmental |
| Cheltenham Township Republican Committee | Governmental |
| Colorado Technical Reference Center | Governmental |
| Chief Collection Cryptologic Technician | Governmental |
| Cryptologic (collection) Chief Petty Officer | Governmental |
| Cancer Therapy Research Center | Medical |
| Clinical and Translational Review Committee | Medical |
| Clinical Trials Resource Center | Medical |
| Cancer Therapy and Research Center | Medical |
| California Trolley and Railroad Corporation | Regional |
