| Name | City | St. | Country | Email | Scope | Network | Update | Map |
| Chicago Student Activist Network | Chicago | Illinois | United States | Email | Metro | | 09-18
2011 |  |
| Chican@/Latin@ Psych-Soc | | California | United States | Email | Local | | 04-21
2005 | |
| Chicanos In Law @C.S.U., Fresno | Fresno | California | United States | Email | Local | | 09-10
2006 | |
| Child Care Cooperative | Miami | Florida | United States | Email | Local | | 12-15
2004 | |
| Chilfren International Summer Villages Italy | | | Italy | Email | National | | 07-22
2005 | |
| Chinese University Student Press | Hong Kong | | Hong Kong | | Local | | 07-30
2008 | |
| CHispA (carolina hispanic association) | Chapel Hill | North Carolina | United States | Email | Local | | 04-20
2006 | |
| Choice USA | Washington | District Of Columbia | United States | Email | National | Network | 01-07
2009 | |
| Christ Free Redemption Team | Ijebu Ode | OG | Nigeria | Email | Local | | 01-08
2006 | |
| CHS Student Union for Progressive Action | Melrose Park | Pennsylvania | United States | Email | Local | | 11-17
2004 | |
| Cinema Libre Studio | Canoga Park | California | United States | Email | International | | 03-11
2009 | |
| Citizens Against Marijuana Prohibition | Kingston | New York | United States | | State | Network | 05-05
2009 | |
| Citizens for Peace, Cobb County, GA | Marietta | Georgia | United States | Email | Local | | 10-27
2003 | |
| Citizens United for Rehabilitation of Errants CURE | Washington | District of Columbia | United States | | International | Network | 07-05
2007 | |
| Civil Rights Team | Milo | Maine | United States | Email | Metro | | 10-29
2006 | |
| Claremont High School Environmental Club | Claremont | California | United States | Email | Local | | 08-15
2006 | |
| Classic Communications | Foxboro | Massachusetts | United States | Email | Local | | 12-04
2005 | |
| Clean Air Council | Philadelphia | Pennsylvania | United States | | Regional | | 05-26
2010 | |
| Clean Water Action | Allentown | Pennsylvania | United States | Email | National | | 09-24
2004 | |
| Clean Water Action Alliance of Minnesota | Minneapolis | Minnesota | United States | Email | State | Network | 07-02
2008 | |
