| Clinic for the Rehabilitation of WildlifeEIN 23-7271040 | Animals | FL | $1,469,633Small | 88.36 |
| Coalition Against Trafficking in WomenEIN 22-3032134 | International | NY | $720,237Small | 82.48 |
| Coalition for Clean AirEIN 23-7120567 | Environment | CA | $1,050,597Small | 85.15 |
| Coalition for the HomelessEIN 13-3072967 | Human Services | NY | $11,680,807Mid-sized | 89.70 |
| Coalition on Temporary ShelterEIN 38-2420565 | Human Services | MI | $8,585,803Mid-sized | 89.88 |
| Coalition to Restore Coastal LouisianaEIN 72-1115589 | Environment | LA | $2,240,672Small | 85.48 |
| Coast Guard FoundationEIN 04-2899862 | Human Services | CT | $6,525,302Mid-sized | 83.53 |
| Coastal Bend Food Bank EIN 74-2234089 | Human Services | TX | $16,183,493Large | 88.35 |
| Coastal Conservation AssociationEIN 74-1984482 | Environment | TX | $13,776,533Large | 81.37 |
| Coastal Maine Botanical GardensEIN 01-0476545 | Environment | ME | $4,847,073Mid-sized | 85.71 |
| COCAEIN 43-1395056 | Education | MO | $5,999,290Mid-sized | 83.54 |
| Cocoon HouseEIN 91-1497667 | Human Services | WA | $4,854,869Mid-sized | 87.51 |
| Collaborative for Academic, Social, and Emotional LearningEIN 20-5884201 | Education | IL | $6,773,512Mid-sized | 88.56 |
| College Golf FellowshipEIN 55-0798282 | Religion | CA | $2,573,949Small | 81.83 |
| CollegeBound FoundationEIN 52-1598921 | Education | MD | $3,336,619Small | 85.81 |
| Colon Cancer Coalition EIN 30-0377727 | Health | MN | $1,402,947Small | 86.69 |
| Colonial Williamsburg FoundationEIN 54-0505888 | Arts, Culture, Humanities | VA | $138,893,757Large | 84.28 |
| Colorado Education InitiativeEIN 26-1597530 | Education | CO | $7,489,959Mid-sized | 85.38 |
| Colorado Neurological InstituteEIN 84-1100975 | Health | CO | $2,596,095Small | 80.93 |
| Colorado Springs Philharmonic OrchestraEIN 74-3091110 | Arts, Culture, Humanities | CO | $3,917,452Mid-sized | 85.50 |
| Colorado SymphonyEIN 84-0511458 | Arts, Culture, Humanities | CO | $13,000,490Mid-sized | 82.60 |
| Colorado UpLiftEIN 84-0889330 | Education | CO | $5,716,706Mid-sized | 87.29 |
| Columbus Citizens FoundationEIN 13-6118967 | Education | NY | $4,362,512Mid-sized | 85.20 |
| Columbus HumaneEIN 31-4379492 | Animals | OH | $2,907,190Small | 87.61 |
| Columbus Symphony OrchestraEIN 31-6402408 | Arts, Culture, Humanities | OH | $8,505,883Mid-sized | 86.14 |
| Comic Relief Inc.EIN 01-0885377 | Human Services | NY | $91,909,090Large | 89.02 |
| Coming CleanEIN 04-3429794 | Environment | VT | $984,122Small | 82.69 |
| Committee on Temporary ShelterEIN 03-0285606 | Human Services | VT | $3,566,411Mid-sized | 88.33 |
| Common Counsel FoundationEIN 94-3214166 | Community Development | CA | $3,914,023Mid-sized | 85.93 |
| Commonwealth Foundation EIN 23-2473845 | Research and Public Policy | PA | $2,993,022Small | 88.36 |
| Communities for a Better EnvironmentEIN 94-2998086 | Environment | CA | $2,066,472Small | 83.88 |
| Communities In Schools of GeorgiaEIN 58-1912923 | Education | GA | $2,649,158Small | 85.85 |
| Communities In Schools of JacksonvilleEIN 59-3027895 | Education | FL | $7,374,320Mid-sized | 82.87 |
| Communities In Schools of Pittsburgh-Allegheny CountyEIN 25-1728521 | Education | PA | $749,377Small | 82.02 |
| Communities in Schools of RichmondEIN 54-1799922 | Education | VA | $3,212,373Small | 87.37 |
| Communities in Schools of the Charleston AreaEIN 57-0915384 | Education | SC | $1,667,084Small | 85.38 |
| Communities In Schools of the Dallas RegionEIN 75-2044117 | Education | TX | $4,919,164Mid-sized | 84.87 |
| Community Action HouseEIN 23-7120670 | Human Services | MI | $2,417,828Small | 87.96 |
| Community Action Services and Food BankEIN 87-0491952 | Community Development | UT | $8,607,245Mid-sized | 86.84 |
| Community Arts Music AssociationEIN 95-1816010 | Arts, Culture, Humanities | CA | $2,083,604Small | 88.35 |
| Community Environmental CouncilEIN 94-1728064 | Environment | CA | $1,225,334Small | 87.24 |
| Community Family Life ServicesEIN 52-0910609 | Human Services | DC | $2,180,158Small | 88.28 |
| 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 Grant County IndianaEIN 31-1117791 | Community Development | IN | $1,794,639Small | 88.09 |
| Community Foundation of Tampa BayEIN 59-3001853 | Community Development | FL | $13,499,209Mid-sized | 87.11 |
| Community Foundation of the Virgin IslandsEIN 66-0470703 | Community Development | VI | $2,455,865Small | 89.50 |
| Community Foundation of Western MassachusettsEIN 22-3089640 | Community Development | MA | $10,280,261Mid-sized | 86.50 |
| Community Health Charities of NebraskaEIN 23-7162972 | Health | NE | $1,903,135Small | 82.09 |
| Community Health Free ClinicEIN 13-4228071 | Health | IA | $1,449,339Small | 88.83 |
| Community Preparatory SchoolEIN 22-2485332 | Education | RI | $2,630,532Small | 81.07 |
| Community SeniorServEIN 95-2771715 | Human Services | CA | $11,711,293Mid-sized | 87.57 |
| Community ServingsEIN 22-3154028 | Human Services | MA | $6,196,962Mid-sized | 89.01 |
| Community Shares of ColoradoEIN 74-2401941 | Human Services | CO | $3,482,318Small | 87.97 |
| Community Shares of MinnesotaEIN 41-1334642 | Human Services | MN | $987,506Small | 85.01 |
| COMPASEIN 41-1228092 | Arts, Culture, Humanities | MN | $1,375,763Small | 85.95 |
| Compassion InternationalEIN 36-2423707 | International | CO | $861,733,317Large | 84.76 |
| Concern FoundationEIN 23-7002878 | Health | CA | $1,792,550Small | 84.42 |
| Concert Artists GuildEIN 13-1854253 | Arts, Culture, Humanities | NY | $1,562,144Small | 80.14 |
| Concord MuseumEIN 04-2104035 | Arts, Culture, Humanities | MA | $2,742,553Small | 81.67 |