| Campbell County Community College | Academic & Science |
| Coastal Carolina Community College | Academic & Science |
| Commonwealth College Course Collaborative | Academic & Science |
| Collin County Community College | Academic & Science |
| Cerro Coso Community College | Academic & Science |
| Cloud County Community College | Academic & Science |
| Corpus Christi College, Cambridge | Academic & Science |
| Conference College Composition and Communication | Academic & Science |
| Computer Command and Control Company | Business |
| Computerized Conferencing And Communications Center | Business |
| Cheque and Credit Clearing Company | Business |
| College Career Center Consortium | Business |
| China Communications Construction Company Ltd. | Business |
| Cisco Certified Computer Cat | Business |
| Creating A Caring Community For Couples | Community |
| Cichlid Classic Convention Chair | Community |
| Calvert City Church of Christ | Community |
| Colonial Candles Of Cape Cod | Community |
| Community Child Care Center | Community |
| Community Child Care Connection | Community |
| Cambridge Center for Chinese Culture | Community |
| Canyon Country Community Center | Community |
| Community Connection for Child Care | Community |
| Chautauqua County Chamber of Commerce | Community |
| Conference on College Composition and Communication | Community |
| Conservative Congregational Christian Conference | Community |
| Combined Community Charity Challenge | Community |
| Community Coordinated Child Care | Community |
| César Chávez Cultural Center | Community |
| Cover Collector Circuit Club | Community |
| Centro Cultural César Chávez | Community |
| Chiangmai Christian Community Classifieds | Community |
| Calhoun County Cultures and Cuisines | Community |
| Clear Creek Community Church | Community |
| Christ Church Cathedral Choir | Community |
| Compendium of the Catechism of the Catholic Church | Community |
| Community Catholic Church of Canada | Community |
| Camden County Community College | Community |
| Communication, Creativity, Critical thinking, and Collaboration | Community |
| Caroline Chisholm Catholic College | Community |
| Cape Cod Community College | Community |
| Central Carolina Community College | Community |
| Contra Costa Community College | Community |
| Cajun Clickers Computer Club | Computing |
| Communication, Coordination, Cooperation and Clarity | Computing |
| Cape Cod Corvette Club | General |
| Capital City Corvette Club | General |
| Clipper City Corvette Club | General |
| Canadian Council of Corvette Clubs | General |
| Central California Corvette Club | General |
| Central Colorado Corvette Club | General |
| Classic Corvettes of Charlotte County | General |
| Cardigan Classic Car Club | General |
| Cheshire Classic Car Club | General |
| Clacton Classic Car Club | General |
| Crayford Convertible Car Club | General |
| Continuously Chassis Control Concept | General |
| Crossroads Cruisers Car Club | General |
| Carolina Classic Car Club | General |
| Choo Choo Corvair Club | General |
| Creole Classic Car Club | General |
| Cool Cardstock Cornucopia Collection | General |
| C and C Code Counter | General |
| Copic Cute Chrismas Cards | General |
| Cumberland County Chess Club | General |
| Cosmic Coincidence Control Center | General |
| Cut Clarity Color and Carat | General |
| Cokes Cards Cigarettes and Characters | General |
| Coalition For Compassionate Care Of California | General |
| Crafty Cunning Conniving Cohorts | General |
| Concentric Core Current Comparator | General |
| China Communications construction company | General |
| Caprock Classic Car Club | General |
| Corpus Christi Corvette Club | General |
| Cruisin' Classics of Chester County | General |
| Cortina Capri Car Club | General |
| Complete Car Care Center | General |
| Collection Car's Club de Cannes | General |
| Chicago Center for Contemporary Composition | General |
| Classic Cruisers Car Club | General |
| Capital City Car Club | General |
| Classic Car Club of Ceylon | General |
| Camping Car Club Centre | General |
| Combined Coastal Car Club | General |
| Central Coast Car Club | General |
| Central Coast Commodore Club | General |
| Colac Collectable Car Club | General |
| Chesapeake Classic Car Club | General |
| Center City Commuter Connection | General |
| Collector Car Council of Colorado | General |
| Classic Chassis Car Clubs | General |
| Circle City Corvette Club | General |
| Coastal Carolina Corvette Club | General |
| Crescent City Corvette Club | General |
| Combat Casualty Care Course | Governmental |
| Cedar Creek Corrections Center | Governmental |
| Clear Creek Community Council | Governmental |
| Cumberland County Civic Center | Governmental |
| Cape Colony Cyclist Corps | Governmental |
| Cambridgeshire County Cricket Club | Regional |
| Cheshire County Cricket Club | Regional |
| Cornwall County Cricket Club | Regional |
| Cumberland County Cricket Club | Regional |
| Canadian Corkscrew Collectors Club | Regional |
| Clark County Community College | Regional |
| Cherry Capital Cycling Club | Sports |