| Columbus Society of Communicating Arts | Academic & Science |
| Coral Springs Christian Academy | Academic & Science |
| Colorado Springs Charter Academy | Academic & Science |
| Cassco Capital Corporation of Delaware | Business |
| Certified Supply Chain Analyst | Business |
| Conference of State Communications Agencies | Community |
| Cambridge School of Culinary Arts | Community |
| Center School Community Association | Community |
| Central States Communication Association | Community |
| California School of Culinary Arts | Community |
| Carson Sister Cities Association | Community |
| Clumber Spaniel Club of America | Community |
| California State Coroners Association | Community |
| California Sporting Clays Association | Community |
| Colorado Spirit Coaches Association's | Community |
| Connecticut School Counselor Association | Community |
| Colorado School Counselor Association | Community |
| Colorado Spirit Coaches Association | Community |
| Colorado Sporting Clay Association | Community |
| Colorado Sporting Clays Association | Community |
| Centre for Spirituality and Cultural Advancement | Community |
| Colorado State Chess Association | General |
| California State Collection of Arthropods | General |
| Chinese Service Center of America | General |
| Colorado State Chess Association's | General |
| Carlsbad Sister City Ambassadors | General |
| Communist State of CaliforniA | General |
| Common Short Code Administrator | General |
| Chambre Syndicale des Constructeurs d'Automobiles | General |
| Co-Secant Computing Amplifier | Governmental |
| Canadian Special Crops Association | Regional |
| Connecticut Soccer Coaches Association | Sports |
