| Concord MuseumEIN 04-2104035 | Arts, Culture, Humanities | MA | $2,742,553Small | 81.67 |
| Conexión AméricasEIN 62-1715618 | Human Services | TN | $2,437,718Small | 91.45 |
| Conference of Presidents of Major American Jewish Organizations FundEIN 13-3116652 | International | NY | $1,975,532Small | 77.02 |
| ConnCANEIN 20-1612161 | Education | CT | $2,013,054Small | 76.38 |
| Connect2Help 2-1-1EIN 31-1216792 | Human Services | IN | $2,490,328Small | 88.76 |
| Connecticut Association for Human ServicesEIN 06-0653158 | Research and Public Policy | CT | $1,624,056Small | 86.93 |
| Connecticut Cancer FoundationEIN 06-1240574 | Health | CT | $942,787Small | 88.74 |
| Connecticut Historical SocietyEIN 06-6026012 | Arts, Culture, Humanities | CT | $3,041,718Small | 85.24 |
| Connecticut LandmarksEIN 06-0789151 | Arts, Culture, Humanities | CT | $1,955,963Small | 90.31 |
| Connecticut Voices for ChildrenEIN 06-1435280 | Human Services | CT | $1,151,496Small | 90.86 |
| Connections for Abused Women and their ChildrenEIN 36-2950380 | Human Services | IL | $1,833,855Small | 94.58 |
| Conservation Colorado Education FundEIN 84-0614285 | Environment | CO | $1,902,201Small | 92.20 |
| Conservation Foundation of the Gulf CoastEIN 20-0345249 | Environment | FL | $1,097,099Small | 95.85 |
| Conservation MinnesotaEIN 41-2017329 | Environment | MN | $1,455,520Small | 88.06 |
| Conservation NorthwestEIN 94-3091547 | Environment | WA | $2,055,902Small | 87.29 |
| Conservation Strategy FundEIN 94-3294843 | Environment | DC | $2,079,533Small | 87.92 |
| Constitutional Accountability CenterEIN 52-2063854 | Research and Public Policy | DC | $3,469,685Small | 91.86 |
| Constitutional Rights FoundationEIN 95-2219680 | Education | CA | $1,944,718Small | 86.71 |
| Contemplative OutreachEIN 13-3345685 | Religion | NJ | $864,788Small | 80.86 |
| Contemporary Art Museum St. LouisEIN 43-1202816 | Arts, Culture, Humanities | MO | $2,732,507Small | 91.49 |
| Contemporary Arts Museum HoustonEIN 74-1093771 | Arts, Culture, Humanities | TX | $2,751,030Small | 83.77 |
| Continental Baptist MissionsEIN 38-1398829 | Religion | MI | $2,527,365Small | 74.84 |
| Convalescent Aid SocietyEIN 95-1782304 | Health | CA | $1,081,202Small | 88.51 |
| 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 |
| 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 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 |
| Corporation for Jefferson's Poplar ForestEIN 54-1258296 | Arts, Culture, Humanities | VA | $2,013,364Small | 79.80 |
| Coulee Region Humane SocietyEIN 23-7366713 | Animals | WI | $1,192,417Small | 91.24 |
| Council for Children's RightsEIN 56-1325184 | Human Services | NC | $2,443,075Small | 81.60 |
| 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 Social ConcernEIN 04-2494773 | Human Services | MA | $2,065,231Small | 79.59 |
| 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 |
| 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 |
| Crayons to ClassroomsEIN 26-1594574 | Education | OH | $3,471,859Small | 97.17 |
| 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 Pregnancy Center of TidewaterEIN 54-1267311 | Health | VA | $1,618,062Small | 67.86 |
| Crisis Pregnancy Centers of Greater PhoenixEIN 86-0536082 | Health | AZ | $1,682,802Small | 79.16 |
| Crooked Tree Arts CenterEIN 23-7187264 | Arts, Culture, Humanities | MI | $2,194,400Small | 82.56 |
| Cross Roads HouseEIN 22-2549963 | Human Services | NH | $1,740,795Small | 90.76 |
| Crossroads CenterEIN 47-0700215 | Human Services | NE | $1,174,028Small | 65.07 |
| Crossroads Nogales MissionEIN 86-0804463 | Human Services | AZ | $920,167Small | 46.66 |
| Crossroads of MichiganEIN 38-2539852 | Human Services | MI | $1,325,518Small | 89.70 |
| Crossroads Prison MinistriesEIN 38-2540316 | Religion | MI | $1,852,405Small | 91.11 |
| Crossroads Urban CenterEIN 87-0295751 | Human Services | UT | $1,720,655Small | 94.78 |