| Cookie CartEIN 41-1866804 | Human Services | MN | $1,819,163Small | 86.99 |
| Cookson Hills Christian SchoolEIN 73-0665495 | Human Services | OK | $2,958,651Small | 92.26 |
| Cool GirlsEIN 58-1958246 | Human Services | GA | $557,843Small | 81.93 |
| 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 |
| Coral Reef AllianceEIN 94-3211245 | Environment | CA | $3,119,480Small | 92.03 |
| Cornerstone Assistance NetworkEIN 75-2417646 | Human Services | TX | $3,311,773Small | 94.79 |
| 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 |
| Cornerstone Theater CompanyEIN 95-4493498 | Arts, Culture, Humanities | CA | $1,289,866Small | 86.04 |
| Cornucopia Institute IncorporatedEIN 20-1075143 | Education | WI | $937,760Small | 94.57 |
| Coro New York Leadership CenterEIN 13-3571610 | Education | NY | $2,587,498Small | 87.70 |
| Coro Northern CaliforniaEIN 94-3117758 | Education | CA | $1,502,444Small | 83.85 |
| Corporate AccountabilityEIN 41-1322686 | Human and Civil Rights | MA | $6,385,613Mid-sized | 93.30 |
| Corporation for Jefferson's Poplar ForestEIN 54-1258296 | Arts, Culture, Humanities | VA | $2,013,364Small | 79.80 |
| Corporation for Supportive HousingEIN 13-3600232 | Community Development | NY | $38,140,011Large | 94.67 |
| Correctional Peace Officers FoundationEIN 68-0023302 | Human Services | CA | $8,090,088Mid-sized | 86.30 |
| COSI Center of Science and IndustryEIN 31-4383802 | Arts, Culture, Humanities | OH | $17,916,053Large | 85.79 |
| Coulee Region Humane SocietyEIN 23-7366713 | Animals | WI | $1,192,417Small | 91.24 |
| Council for a Strong AmericaEIN 13-3840271 | Research and Public Policy | DC | $11,660,559Mid-sized | 95.16 |
| Council for Children's RightsEIN 56-1325184 | Human Services | NC | $2,443,075Small | 81.60 |
| Council for Economic EducationEIN 13-1623848 | Education | NY | $5,186,704Mid-sized | 77.37 |
| Council for Educational ChangeEIN 01-0638224 | Education | FL | $2,174,131Small | 85.92 |
| Council for National PolicyEIN 72-0921017 | Research and Public Policy | DC | $2,680,790Small | 84.02 |
| Council of Independent CollegesEIN 01-6004776 | Education | DC | $13,706,554Large | 87.42 |
| Council of Social ConcernEIN 04-2494773 | Human Services | MA | $2,065,231Small | 79.59 |
| Council on Foreign RelationsEIN 13-1628168 | International | NY | $69,262,800Large | 87.81 |
| Country Music FoundationEIN 62-0753887 | Arts, Culture, Humanities | TN | $31,719,231Large | 80.61 |
| Couple to Couple LeagueEIN 31-0842914 | Human and Civil Rights | OH | $1,615,421Small | 86.15 |
| Courage WorldwideEIN 20-3126288 | International | CA | $991,803Small | 76.16 |
| Court Appointed Special Advocates of Collin CountyEIN 75-2391961 | Human Services | TX | $1,201,787Small | 91.33 |
| Court Appointed Special Advocates of Orange CountyEIN 33-0069334 | Human Services | CA | $2,514,265Small | 87.81 |
| 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 New YorkEIN 13-3076376 | Human Services | NY | $21,165,223Large | 88.04 |
| 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 |
| Coyote Hill Christian Children's HomeEIN 43-1601128 | Human Services | MO | $1,387,328Small | 83.99 |
| Cradle BeachEIN 16-0743025 | Human Services | NY | $2,496,471Small | 83.94 |
| Cradles to CrayonsEIN 04-3584367 | Human Services | MA | $15,682,610Large | 96.46 |
| Crayons to ClassroomsEIN 26-1594574 | Education | OH | $3,471,859Small | 97.17 |
| 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 |
| Creative Capital FoundationEIN 31-1605982 | Arts, Culture, Humanities | NY | $5,792,226Mid-sized | 92.38 |
| Creative CommonsEIN 04-3585301 | Research and Public Policy | CA | $3,342,546Small | 89.05 |
| Creative MinistriesEIN 23-2269420 | Religion | PA | $1,980,048Small | 61.78 |
| Creative TimeEIN 13-2835847 | Arts, Culture, Humanities | NY | $2,920,073Small | 86.13 |
| Creede Repertory TheatreEIN 84-0660026 | Arts, Culture, Humanities | CO | $1,623,226Small | 91.03 |
| Crescent ProjectEIN 35-1790297 | Religion | IN | $1,844,034Small | 71.39 |
| Crisis Aid InternationalEIN 30-0060905 | International | MO | $2,225,357Small | 97.05 |
| Crisis Assistance MinistryEIN 56-1416719 | Human Services | NC | $15,189,615Large | 89.39 |
| Crisis Control MinistryEIN 23-7348168 | Human Services | NC | $4,455,399Mid-sized | 89.39 |