| Last Name | First Name | Chamber | Party | State | Rating | Taxpayer Category |
|---|---|---|---|---|---|---|
| Mace | Nancy | House | R | South Carolina | 62 | Friendly |
| Magaziner | Seth | House | D | Rhode Island | 2 | Hostile |
| Malliotakis | Nicole | House | R | New York | 56 | Lukewarm |
| Maloy | Celeste | House | R | Utah | 6 | Hostile |
| Mann | Tracey | House | R | Kansas | 80 | Taxpayer Hero |
| Manning | Kathy | House | D | North Carolina | 6 | Hostile |
| Massie | Thomas | House | R | Kentucky | 100 | Taxpayer Super Hero |
| Mast | Brian | House | R | Florida | 83 | Taxpayer Hero |
| Matsui | Doris | House | D | California | 2 | Hostile |
| McBath | Lucy | House | D | Georgia | 2 | Hostile |
| McCaul | Michael | House | R | Texas | 48 | Lukewarm |
| McClain | Lisa | House | R | Michigan | 73 | Friendly |
| McClellan | Jennifer | House | D | Virginia | 2 | Hostile |
| McClintock | Tom | House | R | California | 100 | Taxpayer Super Hero |
| McCollum | Betty | House | D | Minnesota | 2 | Hostile |
| McCormick | Rich | House | R | Georgia | 97 | Taxpayer Hero |
| McGarvey | Morgan | House | D | Kentucky | 2 | Hostile |
| McGovern | James | House | D | Massachusetts | 0 | Hostile |
| McHenry | Patrick | House | R | North Carolina | 76 | Friendly |
| McMorris Rodgers | Cathy | House | R | Washington | 83 | Taxpayer Hero |
| Meeks | Gregory | House | D | New York | 3 | Hostile |
| Menendez | Rob | House | D | New Jersey | 2 | Hostile |
| Meng | Grace | House | D | New York | 0 | Hostile |
| Meuser | Daniel | House | R | Pennsylvania | 74 | Friendly |
| Mfume | Kweisi | House | D | Maryland | 2 | Hostile |
| Miller | Max | House | R | Ohio | 44 | Lukewarm |
| Miller | Mary | House | R | Illinois | 86 | Taxpayer Hero |
| Miller | Carol | House | R | West Virginia | 79 | Friendly |
| Miller-Meeks | Mariannette | House | R | Iowa | 62 | Friendly |
| Mills | Cory | House | R | Florida | 94 | Taxpayer Hero |
| Molinaro | Marcus | House | R | New York | 42 | Lukewarm |
| Moolenaar | John | House | R | Michigan | 56 | Lukewarm |
| Mooney | Alex | House | R | West Virginia | 95 | Taxpayer Hero |
| Moore | Blake | House | R | Utah | 71 | Friendly |
| Moore | Barry | House | R | Alabama | 94 | Taxpayer Hero |
| Moore | Gwen | House | D | Wisconsin | 2 | Hostile |
| Moran | Nathaniel | House | R | Texas | 80 | Taxpayer Hero |
| Morelle | Joseph | House | D | New York | 5 | Hostile |
| Moskowitz | Jared | House | D | Florida | 6 | Hostile |
| Moulton | Seth | House | D | Massachusetts | 2 | Hostile |
| Mrvan | Frank | House | D | Indiana | 2 | Hostile |
| Mullin | Kevin | House | D | California | 2 | Hostile |
| Murphy | Greg | House | R | North Carolina | 79 | Friendly |
| Nadler | Jerrold | House | D | New York | 2 | Hostile |
| Napolitano | Grace | House | D | California | 3 | Hostile |
| Neal | Richard | House | D | Massachusetts | 3 | Hostile |
| Neguse | Joe | House | D | Colorado | 2 | Hostile |
| Nehls | Troy | House | R | Texas | 91 | Taxpayer Hero |
| Newhouse | Dan | House | R | Washington | 39 | Unfriendly |
| Nickel | Wiley | House | D | North Carolina | 3 | Hostile |