| Chinese Cantonese Students Association | Academic & Science |
| Cornell Caribbean Students Association | Academic & Science |
| Concordia Classics Student Association | Academic & Science |
| Caltech Chinese Student Association | Academic & Science |
| College Center for Scholarly Advancement | Academic & Science |
| Christian Choral Society of Austin | Academic & Science |
| Canadian Catholic Students Association | Business |
| Christ Church Schools Association | Business |
| Chinese Culture Study Association | Business |
| Concordia Chinese Students Association | Business |
| Chinese Christian Softball Association | Business |
| Child Care Services Association | Business |
| Checkpoint Certified Systems Administrator | Certifications |
| Certification In Control Self Assessment | Certifications |
| Contemporary Chinese School of Arizona | Community |
| Cyber Conflict Studies Association | Community |
| Classical Christian School for the Arts | Community |
| California Central Service Association | Community |
| Contemporary Ceramic Studios Association | Community |
| Calvary Chapel Surfing Association | Community |
| Committee for the Coordination of Statistical Activities | Community |
| Chester Charter School for the Arts | Community |
| Community Christian Service Agency | Community |
| California Charter Schools Association | Community |
| Central Collegiate Ski Association | Community |
| Collaborative Conference on Student Achievement | Community |
| Collaborative Conference for Student Achievement | Community |
| Cannonsburg Challenged Ski Association's | Community |
| Cannonsburg Challenged Ski Association | Community |
| Coalition for Community Solar Access | Community |
| Caravan Club of South Africa | Community |
| Contemporary Ceramics Association and | Community |
| Community Connections Solutions Australia | Community |
| Cab Calloway School of the Arts | Community |
| Client Computer Support Analyst | Computing |
| Center For Computational Structural Acoustics | Computing |
| Creative Commons Share Alike | General |
| Chongqing Changan Suzuki Automobile | General |
| Club Citroen of South Australia | General |
| Cobra Club of South Africa | General |
| Corvette Club of South Australia | General |
| Chesapeake Community Supported Agriculture | General |
| Carry Completion Sensing Adder | General |
| Cooked Community Supported Agriculture | General |
| Children's Chorus of San Antonio | General |
| Combined Community Supported Agriculture | General |
| Center for Collision Safety and Analysis | General |
| The Core Curriculum Standards Assessment | General |
| Ccsacooperative Center For Study Abroad | General |
| Credit Counselling Services Of Alberta | General |
| Cooperative Center For Study Abroad | General |
| China Communications Standards Association | Governmental |
| CA Council of School Attorneys | Governmental |
| U.S. Army Command and Control Support Agency | Governmental |
| California Council Of School Attorneys | Governmental |
| Checkpoint Certified Security Administrator | Jobs |
| Command and Control Support Agency | Military and Defence |
| Containership Cargo Stowage Adapter | Military and Defence |
| Canadian Centre on Substance Abuse | Regional |
| Cook County State's Attorney | Regional |
| Canadian Cable Systems Alliance | Regional |
| Canadian Contemporary School of Art | Regional |
| Clermont Central Soccer Association | Sports |
| Coastal Collegiate Swimming Association | Sports |
| Clark County Soccer Association | Sports |
| Cape Coral Soccer Association | Sports |
| Coastal Collegiate Sports Association | Sports |
| Cottonwood Creek Sports Academy | Sports |
| Clermont Central Soccer Association Clermont Central Soccer Association | Sports |
| Common Control Switching Arrangement | Telecommunication |
