| Malachi HouseEIN 34-1598707 | Human Services | OH | $1,410,317Small | 77.65 |
| Maltz Museum of Jewish HeritageEIN 04-3684531 | Arts, Culture, Humanities | OH | $3,165,496Small | 85.21 |
| Mama's KitchenEIN 33-0434246 | Human Services | CA | $2,555,149Small | 78.24 |
| Man in the MirrorEIN 59-3178628 | Religion | FL | $3,291,289Small | 91.04 |
| Manatee Performing Arts CenterEIN 59-1196043 | Arts, Culture, Humanities | FL | $2,418,900Small | 94.85 |
| Manna Food PantriesEIN 59-2181031 | Human Services | FL | $1,417,371Small | 76.76 |
| Manna on Main StreetEIN 23-2287252 | Human Services | PA | $2,603,058Small | 87.92 |
| Mano a Mano InternationalEIN 41-1796971 | International | MN | $2,440,095Small | 91.32 |
| Manos De CristoEIN 74-2511974 | Human Services | TX | $3,304,940Small | 94.69 |
| Manship TheatreEIN 20-3999559 | Arts, Culture, Humanities | LA | $2,015,238Small | 72.39 |
| MapLightEIN 33-1094233 | Human and Civil Rights | CA | $2,988,723Small | 89.96 |
| Marathon KidsEIN 06-1722171 | Human Services | TX | $2,921,366Small | 95.34 |
| Marian HouseEIN 52-1243849 | Human Services | MD | $3,076,163Small | 90.13 |
| Marian Middle SchoolEIN 43-1873629 | Education | MO | $1,735,400Small | 90.04 |
| Marijuana Policy Project FoundationEIN 52-1975211 | Research and Public Policy | DC | $2,866,841Small | 77.62 |
| Marine Conservation InstituteEIN 91-1725640 | Environment | WA | $1,068,198Small | 81.68 |
| Marine Corps Association FoundationEIN 80-0340923 | Human Services | VA | $1,536,917Small | 71.95 |
| Marine Corps University FoundationEIN 54-1143646 | Education | VA | $2,054,228Small | 90.23 |
| Mario Lemieux FoundationEIN 25-1708231 | Health | PA | $1,249,212Small | 78.92 |
| Mark Wahlberg Youth FoundationEIN 04-3567369 | Education | MA | $1,573,707Small | 92.22 |
| Mars Hill ProductionsEIN 76-0235320 | Religion | TX | $979,513Small | 83.98 |
| Martha's KitchenEIN 91-2091094 | Human Services | CA | $1,854,157Small | 91.51 |
| Martha's Vineyard MuseumEIN 04-2160642 | Arts, Culture, Humanities | MA | $2,030,611Small | 73.37 |
| MarwenEIN 36-3523622 | Education | IL | $2,669,179Small | 86.93 |
| Maryland Historical SocietyEIN 52-0403670 | Arts, Culture, Humanities | MD | $3,479,411Small | 84.20 |
| Maryland Therapeutic RidingEIN 52-2035698 | Health | MD | $988,423Small | 80.56 |
| MasbiaEIN 20-1923521 | Human Services | NY | $1,581,255Small | 67.39 |
| Masonic Home of GeorgiaEIN 58-0140568 | Human Services | GA | $1,970,070Small | 87.50 |
| Masonic Medical Research LaboratoryEIN 13-5648611 | Health | NY | $3,253,665Small | 79.52 |
| Mass Mentoring PartnershipEIN 22-3207958 | Human Services | MA | $2,420,195Small | 87.97 |
| Massachusetts Down Syndrome CongressEIN 22-2596246 | Health | MA | $1,509,177Small | 89.75 |
| Massachusetts Horticultural SocietyEIN 04-2104714 | Environment | MA | $1,690,583Small | 83.57 |
| Massachusetts Immigrant and Refugee Advocacy CoalitionEIN 22-3115048 | Human and Civil Rights | MA | $1,949,092Small | 86.25 |
| Massanetta SpringsEIN 54-0505926 | Religion | VA | $1,173,464Small | 74.84 |
| MassBioEdEIN 22-3799632 | Education | MA | $1,302,935Small | 87.92 |
| MassINCEIN 04-3271457 | Research and Public Policy | MA | $1,950,185Small | 83.15 |
| Mastermedia InternationalEIN 33-0104548 | Religion | CA | $1,427,531Small | 70.76 |
| MasterVoicesEIN 13-1606158 | Arts, Culture, Humanities | NY | $1,780,240Small | 86.08 |
| MATHCOUNTSEIN 54-1295407 | Education | VA | $2,746,171Small | 89.42 |
| Matt Talbot Kitchen & OutreachEIN 36-3945814 | Human Services | NE | $1,804,330Small | 91.39 |
| Mattatuck MuseumEIN 06-0443990 | Arts, Culture, Humanities | CT | $2,420,763Small | 84.18 |
| Mattress FactoryEIN 25-1338941 | Arts, Culture, Humanities | PA | $2,030,527Small | 87.88 |
| Maumee Valley Habitat for HumanityEIN 34-1584728 | Community Development | OH | $2,022,081Small | 96.22 |
| MaxFundEIN 84-1116882 | Animals | CO | $2,789,821Small | 93.74 |
| May Dugan CenterEIN 23-7061949 | Human Services | OH | $2,213,538Small | 90.94 |
| May FestivalEIN 31-0584309 | Arts, Culture, Humanities | OH | $2,682,723Small | 89.17 |
| Mayor's Alliance for NYC's AnimalsEIN 73-1653635 | Animals | NY | $1,632,234Small | 76.21 |
| MA‘O Organic FarmsEIN 99-0350803 | Education | HI | $1,580,098Small | 83.01 |
| McColl Center for Art + InnovationEIN 51-0195015 | Arts, Culture, Humanities | NC | $1,899,053Small | 81.20 |
| McKee Botanical GardenEIN 65-1189895 | Environment | FL | $1,443,755Small | 81.60 |
| McLaughlin Research Institute for Biomedical SciencesEIN 81-0459235 | Health | MT | $2,615,523Small | 87.14 |
| McLean County Museum of HistoryEIN 37-1414038 | Arts, Culture, Humanities | IL | $1,226,621Small | 84.49 |
| MDS FoundationEIN 22-3283911 | Health | NJ | $3,321,416Small | 88.22 |
| Meals on Wheels Diablo RegionEIN 68-0044205 | Human Services | CA | $2,114,669Small | 94.69 |
| Meals on Wheels of Contra CostaEIN 68-0231350 | Human Services | CA | $1,624,164Small | 84.42 |
| Meals on Wheels of GreenvilleEIN 57-0531378 | Human Services | SC | $1,871,108Small | 84.92 |
| Meals on Wheels of Johnson & Ellis CountiesEIN 75-1555153 | Human Services | TX | $2,548,467Small | 82.16 |
| Meals on Wheels of TampaEIN 59-1679915 | Human Services | FL | $2,372,731Small | 93.57 |
| Meals on Wheels of the Monterey PeninsulaEIN 94-2157521 | Human Services | CA | $1,615,923Small | 87.14 |
| Meals on Wheels of Wake CountyEIN 56-1061085 | Human Services | NC | $2,758,088Small | 86.42 |