| Lyric Opera of Kansas CityEIN 44-0626124 | Arts, Culture, Humanities | MO | $6,714,592Mid-sized | 89.96 |
| Lyric TheatreEIN 73-1001687 | Arts, Culture, Humanities | OK | $4,634,911Mid-sized | 90.34 |
| Madison Children's MuseumEIN 39-1383497 | Arts, Culture, Humanities | WI | $3,527,783Mid-sized | 75.57 |
| Madison Public Library FoundationEIN 39-1777242 | Arts, Culture, Humanities | WI | $1,412,832Small | 82.71 |
| Mahaiwe Performing Arts CenterEIN 57-1140453 | Arts, Culture, Humanities | MA | $2,292,098Small | 84.68 |
| Mahoning Valley Historical SocietyEIN 34-0872868 | Arts, Culture, Humanities | OH | $1,151,615Small | 80.94 |
| Maine Historical SocietyEIN 01-0211530 | Arts, Culture, Humanities | ME | $2,301,135Small | 80.31 |
| Maine Maritime MuseumEIN 01-0271477 | Arts, Culture, Humanities | ME | $3,443,241Small | 95.05 |
| Maine Public Broadcasting NetworkEIN 22-3171529 | Arts, Culture, Humanities | ME | $13,328,620Mid-sized | 91.98 |
| Maltz Museum of Jewish HeritageEIN 04-3684531 | Arts, Culture, Humanities | OH | $3,165,496Small | 85.21 |
| Manatee Performing Arts CenterEIN 59-1196043 | Arts, Culture, Humanities | FL | $2,418,900Small | 94.85 |
| Manhattan Theatre ClubEIN 23-7086643 | Arts, Culture, Humanities | NY | $27,356,114Large | 90.34 |
| Manship TheatreEIN 20-3999559 | Arts, Culture, Humanities | LA | $2,015,238Small | 72.39 |
| Marin Theatre CompanyEIN 23-7018125 | Arts, Culture, Humanities | CA | $3,690,566Mid-sized | 91.78 |
| Mark Morris Dance GroupEIN 13-3577394 | Arts, Culture, Humanities | NY | $8,923,444Mid-sized | 91.94 |
| Martha's Vineyard MuseumEIN 04-2160642 | Arts, Culture, Humanities | MA | $2,030,611Small | 73.37 |
| Maryland Historical SocietyEIN 52-0403670 | Arts, Culture, Humanities | MD | $3,479,411Small | 84.20 |
| Maryland Science CenterEIN 52-0668166 | Arts, Culture, Humanities | MD | $8,419,673Mid-sized | 82.58 |
| MASS MoCAEIN 04-3113688 | Arts, Culture, Humanities | MA | $14,296,459Large | 79.41 |
| MasterVoicesEIN 13-1606158 | Arts, Culture, Humanities | NY | $1,780,240Small | 86.08 |
| 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 |
| Maui Arts & Cultural CenterEIN 99-0222998 | Arts, Culture, Humanities | HI | $11,032,907Mid-sized | 78.21 |
| May FestivalEIN 31-0584309 | Arts, Culture, Humanities | OH | $2,682,723Small | 89.17 |
| Maymont FoundationEIN 54-6039788 | Arts, Culture, Humanities | VA | $5,202,382Mid-sized | 88.85 |
| MCC TheaterEIN 13-3391844 | Arts, Culture, Humanities | NY | $5,134,774Mid-sized | 86.29 |
| McCallum TheatreEIN 95-2834871 | Arts, Culture, Humanities | CA | $13,663,160Large | 87.50 |
| McCarter Theatre Center for the Performing ArtsEIN 21-0724198 | Arts, Culture, Humanities | NJ | $12,663,474Mid-sized | 94.20 |
| McColl Center for Art + InnovationEIN 51-0195015 | Arts, Culture, Humanities | NC | $1,899,053Small | 81.20 |
| McLean County Museum of HistoryEIN 37-1414038 | Arts, Culture, Humanities | IL | $1,226,621Small | 84.49 |
| McNay Art MuseumEIN 74-1195277 | Arts, Culture, Humanities | TX | $9,680,975Mid-sized | 91.45 |
| McWane Science CenterEIN 58-1933712 | Arts, Culture, Humanities | AL | $6,970,316Mid-sized | 87.33 |
| Memphis Symphony OrchestraEIN 62-6015885 | Arts, Culture, Humanities | TN | $4,372,302Mid-sized | 79.52 |
| Metropolitan Museum of ArtEIN 13-1624086 | Arts, Culture, Humanities | NY | $492,173,112Large | 95.80 |
| Miami City BalletEIN 59-2578534 | Arts, Culture, Humanities | FL | $16,618,823Large | 84.95 |
| Michigan Opera TheatreEIN 38-2052726 | Arts, Culture, Humanities | MI | $15,538,195Large | 85.35 |
| Michigan Theater FoundationEIN 38-2269013 | Arts, Culture, Humanities | MI | $4,853,236Mid-sized | 90.39 |
| Mid-America Science MuseumEIN 20-2129318 | Arts, Culture, Humanities | AR | $1,975,757Small | 78.05 |
| Midland Community TheatreEIN 75-6003774 | Arts, Culture, Humanities | TX | $1,940,871Small | 85.18 |
| Midland-Odessa Symphony & ChoraleEIN 75-1301544 | Arts, Culture, Humanities | TX | $1,183,096Small | 89.29 |
| Milkweed EditionsEIN 41-1365177 | Arts, Culture, Humanities | MN | $2,115,151Small | 92.88 |
| Milwaukee Art MuseumEIN 39-0806316 | Arts, Culture, Humanities | WI | $19,236,271Large | 91.01 |
| Milwaukee BalletEIN 39-1134735 | Arts, Culture, Humanities | WI | $6,450,332Mid-sized | 89.90 |
| Milwaukee Repertory TheaterEIN 39-0946025 | Arts, Culture, Humanities | WI | $11,651,807Mid-sized | 94.90 |
| Milwaukee Symphony OrchestraEIN 39-6023436 | Arts, Culture, Humanities | WI | $18,202,182Large | 84.79 |
| Mingei International MuseumEIN 23-7433357 | Arts, Culture, Humanities | CA | $3,695,785Mid-sized | 79.45 |
| Minnesota Children's MuseumEIN 41-1354181 | Arts, Culture, Humanities | MN | $9,321,847Mid-sized | 88.69 |
| Minnesota Historical SocietyEIN 41-0713907 | Arts, Culture, Humanities | MN | $60,451,270Large | 89.84 |
| Minnesota Museum of American ArtEIN 41-0726138 | Arts, Culture, Humanities | MN | $1,469,148Small | 89.23 |
| Minnesota OperaEIN 41-0946789 | Arts, Culture, Humanities | MN | $11,190,288Mid-sized | 85.27 |
| Minnesota OrchestraEIN 41-0693875 | Arts, Culture, Humanities | MN | $33,889,255Large | 92.09 |
| Minnesota Public Radio | American Public MediaEIN 41-0953924 | Arts, Culture, Humanities | MN | $98,123,227Large | 92.68 |
| Minnesota State Fair FoundationEIN 41-2013696 | Arts, Culture, Humanities | MN | $1,855,342Small | 83.39 |
| Minnetrista Gathering PlaceEIN 35-1628916 | Arts, Culture, Humanities | IN | $4,487,847Mid-sized | 80.09 |
| MinnPostEIN 26-0573427 | Arts, Culture, Humanities | MN | $1,628,555Small | 77.19 |
| Mint Theater CompanyEIN 13-3687725 | Arts, Culture, Humanities | NY | $1,894,443Small | 90.96 |
| Mississippi Children's MuseumEIN 64-0850010 | Arts, Culture, Humanities | MS | $3,541,158Mid-sized | 97.17 |
| Missouri History MuseumEIN 43-0654866 | Arts, Culture, Humanities | MO | $21,586,472Large | 97.14 |
| Mobile Symphony OrchestraEIN 23-7070234 | Arts, Culture, Humanities | AL | $1,771,327Small | 70.16 |
| Mobius SpokaneEIN 91-1694299 | Arts, Culture, Humanities | WA | $1,677,935Small | 71.83 |