| Other organizations in District of Columbia |
| Id | Name | Address | State | Established | Total Income |
| 1 | Citizens Helping Heroes Inc | 2924 M Street Nw, Washington, DC 20007 | DC | 2004-02 | $428,249 |
| 2 | Citizens Trade Campaign | PO BOX 77077, Washington, DC 20013-8077 | DC | 1999-07 | $499,320 |
| 3 | Citizens United | 1006 Pennsylvania Ave Se, Washington, DC 20003-2142 | DC | 1989-11 | $15,172,681 |
| 4 | Citizens United For The Rehabilitation Of Errants Cure | Po Box 2310, Washington, DC 20013 | DC | 1989-10 | $0 |
| 5 | Citizens United Foundation | 1006 Pennsylvania Ave Se, Washington, DC 20003-2142 | DC | 1992-11 | $5,811,695 |
| 6 | City Arts Inc | 1857 Lamont Street Nw, Washington, DC 20010-3066 | DC | 1998-07 | $320,153 |
| 7 | City At Peace Inc | 1333 H St Ne, Washington, DC 20002-4446 | DC | 1995-03 | $287,799 |
| 8 | City Collegiate Public Charter School Inc | C/O Julia Westfall 3748 Jocelyn St, Washington, DC 20015 | DC | 2006-09 | $1,035,033 |
| 9 | City First Enterprises Inc | 1436 U St Nw Ste 404, Washington, DC 20009-3998 | DC | 1998-07 | $1,249,471 |
| 10 | City First Homes Inc | 1436 U St Nw Ste 404, Washington, DC 20009-3998 | DC | 2009-03 | $609,448 |
| 11 | City Gate Inc | 3920 Alton Pl Nw, Washington, DC 20016-2210 | DC | 2001-05 | $484,130 |
| 12 | City Lights Public Charter School | 62 T St Ne, Washington, DC 20002-1577 | DC | 2006-06 | $2,394,814 |
| 13 | City Parks Alliance Inc | 2121 Ward Ct Nw Fl 5, Washington, DC 20037-1251 | DC | 2002-05 | $531,748 |
| 14 | City Tavern Association | 3206 M St Nw, Washington, DC 20007-3615 | DC | 1964-03 | $1,732,277 |
| 15 | City Tavern Preservation Foundation | 3206 M St Nw, Washington, DC 20007-3615 | DC | 2000-05 | $8,165 |
| 16 | Citybridge Foundation | 600 New Hampshire Ave Nw, Washington, DC 20037-2403 | DC | 1995-05 | $258,177 |
| 17 | Citydance Ensemble Inc | 1111 16th St Nw Ste 300, Washington, DC 20036-4830 | DC | 2000-03 | $1,697,688 |
| 18 | Civic - Campaign For Innocent Victims In Conflict, Civic | 1605 Connecticut Ave Nw 3rd Fl, Washington, DC 20009-1013 | DC | 2005-12 | $781,865 |
| 19 | Civic Engagement Fund Inc | 1920 L St Nw Ste 800, Washington, DC 20036-5045 | DC | 1996-10 | $18 |
| 20 | Civicus World Alliance For Citizen Participation Inc | 1425 K Street Nw, Washington, DC 20005-3500 | DC | 1993-11 | $1,439,979 |
| 21 | Civil Air Patrol, National Capital Wing Hq | 200 Mcchord St Ste 122, Bolling Afb, DC 20032-7700 | DC | 1947-08 | $87,608 |
| 22 | East Coast Chapter Tuskegee Airmen Inc | PO BOX 8541, Washington, DC 20032-8541 | DC | 1985-01 | $151,341 |
| 23 | Civil Justice Foundation | 777 6th St Nw, Washington, DC 20001-3723 | DC | 1987-05 | $86,719 |
| 24 | Civil Justice Reform Group | 1776 K Street Nw, Washington, DC 20006-2304 | DC | 2009-02 | $3,638,672 |
| 25 | Claire Williams Oneil Foundation | 2720 36th Pl Nw, Washington, DC 20007-1415 | DC | 2000-12 | $78,680 |
| 26 | Clean & Sober Streets Inc | PO BOX 77114, Washington, DC 20013-8114 | DC | 1990-08 | $949,976 |
| 27 | Clean Air Watch | 1250 Connecticut Ave Nw Ste 200, Washington, DC 20036-2643 | DC | 2005-12 | $201,208 |
| 28 | Clean Beaches Council | 1225 New York Ave Nw Ste 450, Washington, DC 20005 | DC | 1999-01 | $108,300 |
| 29 | Clean Water Action | 1010 Vermont Ave Nw Ste 400, Washington, DC 20005-4947 | DC | 1973-11 | $8,262,421 |
| 30 | Clean Water America Alliance | 1816 Jefferson Pl Nw, Washington, DC 20036-2505 | DC | 2008-07 | $435,391 |
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