| Communities In Schools of HoustonEIN 76-0031827 | Education | TX | $12,788,149Mid-sized | 91.61 |
| Communities In Schools of JacksonvilleEIN 59-3027895 | Education | FL | $7,374,320Mid-sized | 82.87 |
| Communities In Schools of NevadaEIN 88-0292094 | Education | NV | $6,748,695Mid-sized | 91.30 |
| Communities In Schools of the Dallas RegionEIN 75-2044117 | Education | TX | $4,919,164Mid-sized | 84.87 |
| Community Action Services and Food BankEIN 87-0491952 | Community Development | UT | $8,607,245Mid-sized | 86.84 |
| Community Action Stops AbuseEIN 59-2114359 | Human Services | FL | $4,663,766Mid-sized | 92.75 |
| Community Catalyst EIN 04-3355127 | Human and Civil Rights | MA | $12,149,963Mid-sized | 91.21 |
| Community CoalitionEIN 95-4298811 | Community Development | CA | $5,163,415Mid-sized | 91.86 |
| Community Enrichment CenterEIN 75-2231694 | Human Services | TX | $3,585,846Mid-sized | 93.47 |
| Community Foundation for Muskegon CountyEIN 38-6114135 | Community Development | MI | $10,907,482Mid-sized | 81.69 |
| Community Foundation of Collier CountyEIN 59-2396243 | Community Development | FL | $9,320,322Mid-sized | 88.00 |
| Community Foundation of Henderson CountyEIN 56-1330792 | Community Development | NC | $4,826,345Mid-sized | 95.17 |
| Community Foundation of Tampa BayEIN 59-3001853 | Community Development | FL | $13,499,209Mid-sized | 87.11 |
| Community Foundation of Western MassachusettsEIN 22-3089640 | Community Development | MA | $10,280,261Mid-sized | 86.50 |
| Community Nurse Health CenterEIN 36-2170869 | Health | IL | $5,230,602Mid-sized | 90.78 |
| Community Partners InternationalEIN 94-3375666 | International | CA | $4,237,240Mid-sized | 96.09 |
| Community SeniorServEIN 95-2771715 | Human Services | CA | $11,711,293Mid-sized | 87.57 |
| Community Services LeagueEIN 43-0976396 | Community Development | MO | $4,567,724Mid-sized | 91.31 |
| Community ServingsEIN 22-3154028 | Human Services | MA | $6,196,962Mid-sized | 89.01 |
| Community Volunteers in Medicine EIN 23-2944553 | Health | PA | $7,788,662Mid-sized | 100.00 |
| CompassPoint Nonprofit ServicesEIN 93-1196632 | Community Development | CA | $3,901,504Mid-sized | 90.56 |
| Concerned Women for AmericaEIN 95-3580834 | Human and Civil Rights | DC | $3,799,892Mid-sized | 77.44 |
| Concerns of Police SurvivorsEIN 52-1354370 | Human Services | MO | $4,382,937Mid-sized | 92.22 |
| Congressional Black Caucus FoundationEIN 52-1160561 | Research and Public Policy | DC | $7,300,039Mid-sized | 89.01 |
| Congressional Medal of Honor FoundationEIN 25-1828488 | Human and Civil Rights | VA | $4,580,569Mid-sized | 100.00 |
| Congressional Sportsmen's FoundationEIN 52-1686163 | Animals | DC | $4,450,193Mid-sized | 78.44 |
| Connecticut Audubon SocietyEIN 06-0653531 | Environment | CT | $3,731,785Mid-sized | 94.19 |
| Connecticut Fund for the EnvironmentEIN 06-0990195 | Environment | CT | $3,663,406Mid-sized | 92.37 |
| Connecticut Humane SocietyEIN 06-0667605 | Animals | CT | $8,990,903Mid-sized | 89.17 |
| Connecticut Legal ServicesEIN 06-0955461 | Human and Civil Rights | CT | $11,944,323Mid-sized | 79.00 |
| Connie Maxwell Children's HomeEIN 57-0324927 | Human Services | SC | $9,553,199Mid-sized | 87.85 |
| Conservancy for Cuyahoga Valley National ParkEIN 34-1917257 | Environment | OH | $4,242,928Mid-sized | 88.91 |
| Conservancy of Southwest FloridaEIN 59-1157084 | Environment | FL | $8,102,079Mid-sized | 93.89 |
| Conservation Lands FoundationEIN 20-8924520 | Environment | CO | $7,028,672Mid-sized | 94.33 |
| Conservation Law FoundationEIN 04-6149986 | Environment | MA | $9,439,409Mid-sized | 91.21 |
| Contemporary Arts Center, CincinnatiEIN 31-0590095 | Arts, Culture, Humanities | OH | $4,498,292Mid-sized | 84.87 |
| Contemporary Arts Center, New OrleansEIN 72-0798830 | Arts, Culture, Humanities | LA | $3,623,733Mid-sized | 87.95 |
| Contemporary Jewish MuseumEIN 47-0920831 | Arts, Culture, Humanities | CA | $10,845,438Mid-sized | 76.22 |
| Cooperative for EducationEIN 31-1545464 | International | OH | $3,509,251Mid-sized | 91.38 |
| Copperhead CharitiesEIN 59-2319162 | Human Services | FL | $11,761,740Mid-sized | 67.37 |
| Coptic OrphansEIN 54-1637257 | International | VA | $7,447,158Mid-sized | 93.15 |
| Cornerstone Schools AssociationEIN 38-2995984 | Education | MI | $7,238,576Mid-sized | 82.97 |
| Cornerstone Schools of AlabamaEIN 63-0948472 | Education | AL | $4,720,180Mid-sized | 77.92 |
| Cornerstone TeleVisionEIN 23-7112560 | Religion | PA | $5,988,333Mid-sized | 73.71 |
| Corporate AccountabilityEIN 41-1322686 | Human and Civil Rights | MA | $6,385,613Mid-sized | 93.30 |
| Correctional Peace Officers FoundationEIN 68-0023302 | Human Services | CA | $8,090,088Mid-sized | 86.30 |
| Council for a Strong AmericaEIN 13-3840271 | Research and Public Policy | DC | $11,660,559Mid-sized | 95.16 |
| Council for Economic EducationEIN 13-1623848 | Education | NY | $5,186,704Mid-sized | 77.37 |
| Covenant House AlaskaEIN 13-3419755 | Human Services | AK | $7,874,566Mid-sized | 93.90 |
| Covenant House CaliforniaEIN 13-3391210 | Human Services | CA | $10,013,415Mid-sized | 95.24 |
| Covenant House FloridaEIN 59-2323607 | Human Services | FL | $8,311,668Mid-sized | 91.57 |
| Covenant House MichiganEIN 38-3351777 | Human Services | MI | $4,689,658Mid-sized | 96.08 |
| Covenant House MissouriEIN 43-1821599 | Human Services | MO | $3,540,058Mid-sized | 89.95 |
| Covenant House New JerseyEIN 13-3537710 | Human Services | NJ | $10,736,994Mid-sized | 91.77 |
| Covenant House New OrleansEIN 58-1669937 | Human Services | LA | $5,601,620Mid-sized | 97.82 |
| Covenant House TexasEIN 76-0050882 | Human Services | TX | $5,541,296Mid-sized | 90.58 |
| Covenant House WashingtonEIN 13-3537709 | Human Services | DC | $5,553,135Mid-sized | 90.93 |
| Crayons to ComputersEIN 31-1507076 | Education | OH | $10,934,616Mid-sized | 92.38 |
| CREATE FoundationEIN 23-7248582 | Community Development | MS | $8,181,939Mid-sized | 90.58 |
| Creative ActionEIN 74-2856925 | Human Services | TX | $3,712,943Mid-sized | 88.65 |