| Chunghaw Telecom (Chunghwa Tel) |
 Taiwan |
Commercial |
1996 |
0 |
0 |
0 |
| Chungnam National University (CNU) |
 South Korea |
Academic / research |
1952 |
0 |
0 |
0 |
| Cinema 360, Inc. (Consortium led by Flandrau Planetarium) (Cinema 360) |
 United States |
Commercial |
1980 |
0 |
0 |
0 |
| Civilian Space Exploration Team (CSXT) (CSXT) |
United States |
Commercial |
1995 |
0 |
0 |
0 |
| Clark Memorial International High School (Clark MIHS) |
 Japan |
Academic / research |
1992 |
0 |
0 |
0 |
| Clemson University (Clemson) |
United States |
Academic / research |
1889 |
0 |
0 |
0 |
| Clyde Space Ltd. (ClydeSpace) |
 United Kingdom |
Commercial |
2006 |
0 |
0 |
0 |
| CMMB Vision Holdings (China Mobile Multimedia Broadcasting) (CMMB Vision) |
Hong Kong SAR China |
Commercial |
2008 |
0 |
0 |
0 |
| CNR-Frascati (Frascati) |
 Italy |
Academic / research |
|
0 |
0 |
0 |
| Coleman Aerospace (Coleman) |
United States |
Commercial |
1996 |
0 |
0 |
0 |
| Coleman Research Corporation (Coleman) |
United States |
Commercial |
1980 |
0 |
0 |
0 |
| College of Engineering, Pune (COEP) |
 India |
Academic / research |
1854 |
0 |
0 |
0 |
| Colombian Space Commission (CCE) |
 Colombia |
Government / agency |
|
0 |
0 |
0 |
| Colorado State University (CSU) |
United States |
Academic / research |
1870 |
0 |
0 |
0 |
| Columbia Communications Corp. (Columbia Comms) |
United States |
Commercial |
1983 |
0 |
0 |
0 |
| Com Dev International (ComDev) |
 Canada |
Commercial |
1974 |
0 |
0 |
0 |
| Com Dev International/Aylesbury (ComDev) |
United Kingdom |
Commercial |
|
0 |
0 |
0 |
| Comahue National University (Comahue) |
 Argentina |
Academic / research |
1971 |
0 |
0 |
0 |
| Comisión Nacional de Actividades Espaciales (CONAE) |
Argentina |
Government / agency |
1960 |
0 |
0 |
0 |
| Comite des Recherches Spatiales (CRS) |
 France |
Government / agency |
1959 |
0 |
0 |
0 |
| Commissariat a l'Energie Atomique (CEA) - Saclay (CEA) |
France |
Government / agency |
1945 |
0 |
0 |
0 |
| Commission for Science, Tech. and Industry for National Defe (COSTIND) |
 China |
Government / agency |
1982 |
0 |
0 |
0 |
| Committee on Space Research (COSPAR) |
France |
International organisation |
|
0 |
0 |
0 |
| Commonwealth Bureau of Meteorology (CBMET) |
 Australia |
Government / agency |
1955 |
0 |
0 |
0 |
| Communications Research Lab (CRL) |
Japan |
Government / agency |
1988 |
0 |
0 |
0 |
| Compagnie Francaise Thomson-Houston (CFTH) |
France |
Commercial |
1893 |
0 |
0 |
0 |
| Complex-MIT, Moscow Inst of Thermal Tech. (MITT) |
 Russia |
Commercial |
1992 |
0 |
0 |
0 |
| Computer Resources International (CRI/Kobenhavn) |
 Denmark |
Commercial |
|
0 |
0 |
0 |
| Computer Sciences Corp. (CSC) |
United States |
Commercial |
1959 |
0 |
0 |
0 |
| Comtech AeroAstro, Inc (AeroAstro) |
United States |
Commercial |
2008 |
0 |
0 |
0 |
| Concordia University (Concordia U) |
Canada |
Academic / research |
1974 |
0 |
0 |
0 |
| Consensys Inc. (Consensys) |
United States |
Commercial |
2018 |
0 |
0 |
0 |
| Consolidated Vultee Aircraft Corp. (Convair) |
United States |
Commercial |
1943 |
0 |
0 |
0 |
| Consortium Industrial France-Allemand pour le Satellite Symphonie (CIFAS) |
France |
Commercial |
1968 |
0 |
0 |
0 |
| Construcciones Aeronauticas S.A. (CASA) Espacio (CASA) |
 Spain |
Commercial |
1986 |
0 |
0 |
0 |
| Consultative Committee for Space Data Systems (CCSDS) |
France |
International organisation |
|
0 |
0 |
0 |
| Contel Corporation (Contel Corp) |
United States |
Commercial |
1976 |
0 |
0 |
0 |
| Convair |
United States |
Commercial |
1943 |
0 |
0 |
29 |
| Convair Aircraft, Pomona (Convair-Pomona) |
United States |
Commercial |
1952 |
0 |
0 |
0 |
| Copenhagen Suborbitals (CSU) |
Denmark |
Commercial |
2008 |
0 |
0 |
0 |
| Copenhagen University (Koben) |
Denmark |
Academic / research |
1479 |
0 |
0 |
0 |
| Coratec (Cordoba Alta Tecnologia S.E.) (Coratec) |
Argentina |
Commercial |
|
0 |
0 |
0 |
| Cordant Technologies, ThiokolPropulsion (Cordant Tech) |
United States |
Commercial |
1998 |
0 |
0 |
0 |
| Cornell University (Cornell) |
United States |
Academic / research |
1865 |
0 |
0 |
0 |
| COSMIAC, University of New Mexico-Albequerque (UNM COSMIAC) |
United States |
Academic / research |
|
0 |
0 |
0 |
| Cosmogia Inc. (Cosmogia) |
United States |
Commercial |
2011 |
0 |
0 |
0 |
| COSMOS consortium (Aerospatiale/CASA/MBB/Selenia/MSDS) (COSMOS) |
France |
Commercial |
|
0 |
0 |
0 |
| COSPAS-SARSAT (COSPAS-SARSAT) |
|
International organisation |
1979 |
0 |
0 |
0 |
