| Bright BeginningsEIN 52-1697917 | Human Services | DC | $5,112,933Mid-sized | 90.80 |
| Business Executives for National SecurityEIN 52-1271179 | Research and Public Policy | DC | $5,840,585Mid-sized | 91.72 |
| Calvary Women's ServicesEIN 52-1307706 | Human Services | DC | $2,076,427Small | 86.31 |
| Campaign for Tobacco-Free KidsEIN 52-1969967 | Health | DC | $31,138,832Large | 95.05 |
| Cancer Support CommunityEIN 95-4163931 | Health | DC | $7,125,555Mid-sized | 96.66 |
| Capital Area Food BankEIN 52-1167581 | Human Services | DC | $70,273,007Large | 90.15 |
| Capital Research CenterEIN 52-1289734 | Research and Public Policy | DC | $2,844,996Small | 76.58 |
| Carnegie Endowment for International PeaceEIN 13-0552040 | International | DC | $36,544,639Large | 86.94 |
| Carnegie Institution for ScienceEIN 53-0196523 | Research and Public Policy | DC | $100,297,805Large | 87.74 |
| Catholics for ChoiceEIN 52-1154418 | Human and Civil Rights | DC | $3,487,440Small | 93.10 |
| Center for a New American SecurityEIN 20-8084828 | Research and Public Policy | DC | $9,751,151Mid-sized | 96.54 |
| Center for American ProgressEIN 30-0126510 | Research and Public Policy | DC | $46,765,901Large | 91.15 |
| Center for Arms Control and Non-ProliferationEIN 04-2693322 | Human and Civil Rights | DC | $905,915Small | 85.56 |
| Center for Community ChangeEIN 52-0888113 | Community Development | DC | $17,680,880Large | 88.05 |
| Center For Consumer FreedomEIN 26-0006579 | Human and Civil Rights | DC | $3,930,347Mid-sized | 86.10 |
| Center for Economic and Policy ResearchEIN 52-2204029 | Research and Public Policy | DC | $1,990,467Small | 89.08 |
| Center for Education ReformEIN 52-1847187 | Education | DC | $2,366,966Small | 88.69 |
| Center for Food SafetyEIN 52-2165893 | Research and Public Policy | DC | $4,380,584Mid-sized | 85.99 |
| Center for Global DevelopmentEIN 52-2351337 | International | DC | $15,025,801Large | 92.81 |
| Center for Health and Gender EquityEIN 31-1794048 | Human and Civil Rights | DC | $1,685,998Small | 92.22 |
| Center for Immigration StudiesEIN 52-1449368 | Research and Public Policy | DC | $2,816,435Small | 88.40 |
| Center for Individual RightsEIN 52-1600481 | Human and Civil Rights | DC | $1,689,279Small | 94.58 |
| Center for InquiryEIN 22-2306795 | Human and Civil Rights | DC | $4,833,092Mid-sized | 84.95 |
| Center for Inspired TeachingEIN 52-1944180 | Education | DC | $2,133,311Small | 90.58 |
| Center for International Environmental LawEIN 52-1633220 | Environment | DC | $2,606,242Small | 96.20 |
| Center for International PolicyEIN 52-1446207 | International | DC | $5,101,628Mid-sized | 88.46 |
| Center for Justice and International LawEIN 52-1730890 | International | DC | $1,825,964Small | 79.33 |
| Center for Mind-Body MedicineEIN 52-1755744 | Health | DC | $2,257,174Small | 74.85 |
| Center for Public IntegrityEIN 54-1512177 | Research and Public Policy | DC | $5,208,118Mid-sized | 89.11 |
| Center for Responsive PoliticsEIN 52-1275227 | Human and Civil Rights | DC | $2,117,097Small | 97.10 |
| Center for Science in the Public InterestEIN 23-7122879 | Research and Public Policy | DC | $12,565,933Mid-sized | 85.45 |
| Center for Security PolicyEIN 52-1601976 | International | DC | $4,972,423Mid-sized | 91.36 |
| Center for Strategic and Budgetary AssessmentsEIN 52-1930922 | Research and Public Policy | DC | $8,653,272Mid-sized | 84.06 |
| Center for the National InterestEIN 26-2117013 | Research and Public Policy | DC | $4,008,865Mid-sized | 89.04 |
| Center for the Study of Social PolicyEIN 52-1254948 | Human Services | DC | $13,048,910Mid-sized | 89.42 |
| Center for Urban Renewal and EducationEIN 31-1467594 | Research and Public Policy | DC | $1,671,710Small | 78.59 |
| Center of ConcernEIN 52-0941367 | Human and Civil Rights | DC | $931,090Small | 61.71 |
| Center on Budget and Policy PrioritiesEIN 52-1234565 | Research and Public Policy | DC | $28,721,352Large | 90.53 |
| Central Union MissionEIN 53-0218650 | Human Services | DC | $16,421,755Large | 89.86 |
| Child Welfare League of AmericaEIN 13-1641066 | Human Services | DC | $1,733,961Small | 67.38 |
| Children's Defense FundEIN 52-0895622 | Human Services | DC | $19,117,496Large | 84.09 |
| Choral ArtsEIN 52-0895826 | Arts, Culture, Humanities | DC | $1,716,197Small | 85.69 |
| Chorus AmericaEIN 23-2062595 | Arts, Culture, Humanities | DC | $1,317,271Small | 83.19 |
| Christ HouseEIN 52-1362103 | Human Services | DC | $4,017,498Mid-sized | 89.82 |
| Citizens Against Government WasteEIN 52-1363952 | Human and Civil Rights | DC | $3,768,713Mid-sized | 83.69 |
| Citizens for Global Solutions Education FundEIN 52-6081813 | International | DC | $168,324Small | 72.93 |
| Citizens for Responsibility and Ethics in WashingtonEIN 03-0445391 | Human and Civil Rights | DC | $1,995,677Small | 81.04 |
| Citizens United FoundationEIN 54-1626748 | Human and Civil Rights | DC | $3,554,360Mid-sized | 56.74 |
| Clarion ProjectEIN 20-5845679 | Research and Public Policy | DC | $2,549,070Small | 63.65 |
| CLASPEIN 23-7000150 | Research and Public Policy | DC | $6,942,104Mid-sized | 95.42 |
| Clean Water FundEIN 52-1043444 | Environment | DC | $5,390,587Mid-sized | 90.03 |
| Colorectal Cancer AllianceEIN 86-0947831 | Health | DC | $6,452,188Mid-sized | 90.18 |
| Columbia Lighthouse for the BlindEIN 53-0196609 | Human Services | DC | $6,245,235Mid-sized | 76.66 |
| Committee For A Constructive TomorrowEIN 52-1462893 | Environment | DC | $1,754,758Small | 70.10 |
| Common Cause Education FundEIN 31-1705370 | Human and Civil Rights | DC | $7,223,861Mid-sized | 93.96 |
| Communications Consortium Media CenterEIN 52-1524972 | Research and Public Policy | DC | $927,021Small | 79.49 |
| Community Family Life ServicesEIN 52-0910609 | Human Services | DC | $2,180,158Small | 88.28 |
| Compassion Over KillingEIN 52-2034417 | Animals | DC | $1,632,731Small | 78.78 |
| Concerned Women for AmericaEIN 95-3580834 | Human and Civil Rights | DC | $3,799,892Mid-sized | 77.44 |
| Congressional Black Caucus FoundationEIN 52-1160561 | Research and Public Policy | DC | $7,300,039Mid-sized | 89.01 |