| 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 | | | | | | |
| Seeger McCue | GRINNELL | Iowa | Approved | 26124 | | | Grade 5 | | | | | |
| 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 | | | |
| James Merritt | Bedford | TX | Approved | 25008 | Grade 4 Senior (18 and over) | Grade 4 | | | | | | |
| James Merritt | Bedford | TX | Approved | 25008 | Grade 4 Senior (18 and over) | Grade 4 | | | | | | |
| Ferdinand Mienie | MISSOURI VALLEY | Iowa | Approved | 26099 | Grade 5 Senior (18 and over) | | | | | | | |
| Amanda Miller | Sioux Falls | South Dakota | Approved | 26031 | Grade 5 Senior (18 and over) | Grade 4 | | | | | | |
| Joshua Miller | St. Louis | MO | Approved | 26089 | Grade 4 Senior (18 and over) | Grade 4 | | | | | | |
| Nicholas Monin | Willowick | OH | Approved | 20051 | Grade 1 | Grade 1 | | | | | | |
| Ryan Moore | Thunder Bay | ON | Approved | 20896 | Grade 3 | Grade 4 | | | | | | |
| Daniel Moore | Fowler | OHIO | Approved | 26122 | | | Grade 4 | | | | | |
| Evy Mroz | Grand Rapids | MI | Approved | 25024 | | | Grade 4 | | | | | |
| Christopher Mudd | Oklahoma City | OK | Approved | 26083 | Grade 4 Senior (18 and over) | | | | | | | |
| Scott Mueller | Milwaukee | WI | Approved | 20096 | Grade 3 | Grade 3 | | | | | | |
| Mica Murdoch | West Des Moines | iowa | Approved | 20117 | Grade 4 Senior (18 and over) | | | | | | | |
| James Murray | Milan | IN | Approved | 26104 | Grade 5 Senior (18 and over) | (none) | | | | | | |
