| Jessie Lu | Minneapolis | MN | Approved | 25066 | Grade 4 Senior (18 and over) | | | | | | | |
| Sydney Lybert | Pulaski | Wisconsin | Approved | 20929 | Grade 3 | Grade 3 | | | | | | |
| Steve MacDougall | Roscoe | Illinois | Approved | 20287 | (none) | (none) | Grade 4 | (none) | (none) | (none) | | |
| Colum MacKinnon | Minnetonka | MN | Approved | 20114 | Grade 4 Senior (18 and over) | Grade 4 | | | | | | |
| Steven MacLeod | Henrietta | NY | Approved | 20058 | Grade 2 | Grade 2 | | | | | | |
| Calum MacNeil | Dearborn | MI | Approved | 20036 | Grade 1 | Grade 1 | | | | | | |
| Stephen MacNeil | Brethren | michigan | Approved | 26092 | | | | | | | Register as an Adjudicator | |
| Luke Marinelli | Medina | OH | Approved | 26015 | Grade 3 | Grade 3 | | | | | | |
| Susan Martin | Mc Intire | IA | Approved | 20031 | Grade 4 Senior (18 and over) | Grade 4 | | | | | | |
| Susan Martin | Mc Intire | IA | Approved | 20031 | Grade 4 Senior (18 and over) | Grade 4 | | | | | | |
| Susan Martin | Mc Intire | IA | Approved | 20031 | Grade 4 Senior (18 and over) | Grade 4 | | | | | | |
| Crosby Marty | Amherst | OH | Approved | 26075 | | | Grade 4 | | | | | |
| Sebastian Mattern | Brimfield | IL | Approved | 26003 | Grade 4 Junior (under 18) | Grade 4 | | | | | | |
| David May | Walled Lake | MI | Approved | 20366 | Grade 4 Senior (18 and over) | | | | | | | |
| Henry McCarthy | Minneapolis | Minnesota | Approved | 20349 | Grade 1 | Grade 1 | | | | | | |
| Scott M McCawley | Naperville | IL | Approved | 20040 | Grade 1 | Open | | | | | | |
| John McClure | Minneapolis | MN | Approved | 26058 | Grade 5 Senior (18 and over) | Grade 4 | | | | | | |
| Mike McCollum | Deerton | Michigan | Approved | 20250 | Grade 4 Senior (18 and over) | Grade 4 | | | | | | |
| Michael McCollum | Deerton | MI | Approved | 20250 | Grade 4 Senior (18 and over) | Grade 4 | | | | | | |
| Thomas McCollum | Deerton | MI | Approved | 20251 | Grade 1 | Grade 1 | | | | | | |
| Craig McCormick | Albert Lea | MN | Approved | 20238 | Grade 4 Senior (18 and over) | | | | | | | |
| Michael McCoy | Saint Paul | Minnesota | Approved | 26054 | Grade 4 Senior (18 and over) | Grade 4 | | | | | | |
| Roger McCrummen | ELM SPRINGS | Arkansas | Approved | 20354 | Grade 4 Senior (18 and over) | Grade 3 | | | | | | |
| Meghan McElhinney | Akron | Ohio | Approved | 26014 | Grade 1 | Grade 2 | | | | | | |
| Mary McGinley | Kansas City | Missouri | Approved | 20883 | Grade 5 Senior (18 and over) | | | | | | | |
| Tony McGowan | Strongsville | OH | Approved | 26016 | Grade 5 Junior (under 18) | (none) | | | | | | |
| Bill McKee | Pleasanton | Kansas | Approved | 25002 | | | Grade 1 | | | | | |
| Thomas McKee | Prairie Village | Kansas | Approved | 20913 | Open | Open | | | | | | |
| David McNally | INDEPENDENCE | MO | Approved | 20074 | Open | Open | | | | | Register as an Adjudicator | |
| E.J. McNaughton | Iowa City | IA | Approved | 26039 | | | | Novice | Novice | | | |
