| Metro Painting | Metro Painting | — | (916) 690 8855 | Windows, patio, painters | Mokelumne Hill · Calaveras County | — | — |
| Michael Blakey | Michael Blakey | — | (831) 750 0048 | GC, remodel, ADU | Mountain Ranch · Calaveras County | — | — |
| Michael Dell'orto | Michael Dell'orto | — | (209) 304 0159 | Other | Mokelumne Hill · Calaveras County | — | — |
| Michael Johnson Advanced Contracting | Michael Dale Johnson | — | (209) 770 6266 | GC, remodel, ADU | Copperopolis · Calaveras County | — | — |
| Michael Muller Painting | Michael Muller Painting | — | (209) 566 5981 | Windows, patio, painters | Murphys · Calaveras County | — | — |
| Michael Richard Rosenquist | Michael Richard Rosenquist | — | (209) 470 2375 | GC, remodel, ADU | Arnold · Calaveras County | — | — |
| Mid Matthews Construction | Mark Matthew Barnes | — | (209) 484 4788 | GC, remodel, ADU | Copperopolis · Calaveras County | — | — |
| Mike Baker | Mike Baker | — | (510) 376 4390 | Other | Valley Springs · Calaveras County | — | — |
| Mike Hockett Construction | Michelle Angelo Hockett | — | (209) 419 1437 | GC, remodel, ADU | Hathaway Pines · Calaveras County | — | — |
| Mike Nelson - Stone Mason | Mike Nelson - Stone Mason | — | (209) 768 1688 | Other | Murphys · Calaveras County | — | — |
| Mike Ribeira Construction | Michael Stevens Ribeira | — | (209) 728 5003 | GC, remodel, ADU | Copperopolis · Calaveras County | — | — |
| Mikel Jon Gill-foster | Mikel Jon Gill-foster | — | (925) 325 3728 | Other | San Andreas · Calaveras County | — | — |
| Miles Puccinelli Construction | Miles Hanson Puccinelli | — | (209) 728 3083 | GC, remodel, ADU | Murphys · Calaveras County | — | — |
| Miller Construction | Matthew James Miller | — | (650) 759 6874 | GC, remodel, ADU | Valley Springs · Calaveras County | — | — |
| Mills Plumbing | Mills Plumbing | — | (209) 736 4320 | Other | Vallecito · Calaveras County | — | — |
| Mitterwald Construction | Michael Alan Mitterwald | — | (209) 768 2126 | GC, remodel, ADU | Arnold · Calaveras County | — | — |
| Moncada Construction | Moncada Robert | — | (209) 743 2271 | GC, remodel, ADU | Angels Camp · Calaveras County | — | — |
| Moore Custom Drywall | Moore Custom Drywall | — | (209) 604 9331 | Other | Copperopolis · Calaveras County | — | — |
| Moore Electrical Services INC | Michael Calvin Moore | — | (209) 688 4280 | Electricians | Valley Springs · Calaveras County | — | — |
| Morse Refrigeration LLC | Scott Alan Morse | — | (209) 419 2345 | HVAC | San Andreas · Calaveras County | — | — |
| Mother Lode Building | Mother Lode Building | — | (209) 770 4786 | GC, remodel, ADU | Altaville · Calaveras County | — | — |
| Motherlode Fire Protection LLC | Robert Lee Rodgers Singleton | — | (209) 728 7692 | Electricians | Angels Camp · Calaveras County | — | — |
| Motherlode Plumbing INC | Kristopher Allyn Smith | krissmith@motherlodeplumbing.com | (831) 515 2562 | Other | Mokelumne Hill · Calaveras County | — | — |
| Motherlode Roofing LLC | Chad Robert Warren | — | (209) 840 9802 | Other roofers | Angels Camp · Calaveras County | — | — |
| Mountain Property Management | Mountain Property Management | — | (209) 795-7700 | Property managers | Arnold · Calaveras County | — | — |
| Mountain Valley Glass INC | Bert Ely Burns | — | (209) 772 7982 | Windows, patio, painters | Valley Springs · Calaveras County | — | — |
| Mt Property Management | Mt Property Management | — | (209) 210-1704 | Property managers | Lodi · Calaveras County | — | — |
| Mtw Concrete Company | Michael Timothy Webb | — | (925) 963 4820 | Other | Arnold · Calaveras County | — | — |
| Murphys Cabinet Company | Adam Daniel Perry | — | (209) 404 6494 | Other | Murphys · Calaveras County | — | — |
| Murphys Heating And Air Conditioning | Murphys Heating And Air Conditioning | renee@murphyshvac.net | (209) 769 9910 | HVAC | Murphys · Calaveras County | — | — |
| Naipo Construction | John Patricklee Naipo | johnnaipo408@gmail.com | (408) 449 1908 | GC, remodel, ADU | Mokelumne Hill · Calaveras County | — | — |
| Nelson Carpets | Nelson Carpets | — | (209) 772 1691 | Other | Valley Springs · Calaveras County | — | — |
| Newsom Construction | James Martin Newsom | ricknewsom61@hotmail.com | (916) 628-0735 | GC, remodel, ADU | Murphys · Calaveras County | — | — |
| Next Level Construction | Jon Alexander Adams | — | (209) 620 0107 | GC, remodel, ADU | Mokelumne Hill · Calaveras County | — | — |
| Next Level Plastering | Next Level Plastering | — | (209) 200 1906 | Other | Burson · Calaveras County | — | — |
| Nickel Electric LLC | Matthew Hester Nickel | — | (209) 738 9050 | Electricians | Mokelumne Hill · Calaveras County | — | — |
| Nicole Goostree - Land & Home Company | Nicole Goostree - Land & Home Company | — | (209) 743-6786 | Property managers | Murphys · Calaveras County | — | — |
| Nilscraft Construction | Sam William Nilsen | — | (209) 770 5549 | GC, remodel, ADU | Arnold · Calaveras County | — | — |
| Nor Cal Electric | Cade Anthony Riddle | impallari@gmail.com | (209) 660 9006 | Electricians | West Point · Calaveras County | — | — |
| Norcal Construction Co | Harrison Phu Pham | — | (925) 813 5969 | GC, remodel, ADU | Valley Springs · Calaveras County | — | — |