| Modesto Tree Service Company | Modesto Tree Service Company | — | (626) 889-7751 | Tree | Baldwin Park · Tuolumne County | — | — |
| Mohler Construction | Reese Clayton Mohler | — | (209) 743 1071 | GC, remodel, ADU | Sonora · Tuolumne County | — | — |
| Mohlers Decks And Siding | Mohlers Decks And Siding | — | (209) 559 7770 | Windows, patio, painters | Sonora · Tuolumne County | — | — |
| Moore Bros Property Development | Moore Bros Property Development | — | (209) 770 7169 | Other | Big Oak Flat · Tuolumne County | — | — |
| Morrison Construction Company INC DBA Flatline Floors | Jeffrey Lane Morrison | — | (209) 984 1242 | GC, remodel, ADU | Jamestown · Tuolumne County | — | — |
| Morrison Home Improvement | Morrison Home Improvement | — | (209) 559 6690 | GC, remodel, ADU | Sonora · Tuolumne County | — | — |
| Mother Lode Tree Service LLC | Jake Randall Fuller | — | (209) 890 5438 | Tree | Sonora · Tuolumne County | — | — |
| Motherlode Precision Painting | Motherlode Precision Painting | — | (209) 559 9742 | Windows, patio, painters | Sonora · Tuolumne County | — | — |
| Mountain Mann Construction | Anthony Leonard Mann | — | (209) 768 5308 | GC, remodel, ADU | Columbia · Tuolumne County | — | — |
| Mountain Methods INC | Eric James Sanders | — | (209) 288 2906 | GC, remodel, ADU | Tuolumne · Tuolumne County | — | — |
| Mountain Side Landscaping | Mountain Side Landscaping | — | (209) 400 1847 | Windows, patio, painters | Twain Harte · Tuolumne County | — | — |
| Moyle Excavation INC | Lee Edwin Moyle | irl@moyleexcavation.com | (209) 984 4268 | Other | Jamestown · Tuolumne County | — | — |
| Moyle Paving INC | Lee Edwin Moyle | — | (209) 984 4268 | Other | Jamestown · Tuolumne County | — | — |
| Mr Bathtub INC | Andre Jorge Maher | info@mrbathtub.com | (650) 871 7893 | Windows, patio, painters | Standard · Tuolumne County | — | — |
| Nate's Tree Service INC | Michelle Rose Gray | — | (209) 532 2460 | Tree | Sonora · Tuolumne County | — | — |
| National Flooring & Supply INC | Clifton Edward Mc Curley | — | (209) 532 9333 | Other | Sonora · Tuolumne County | — | — |
| Neault Electric | Kevin Alen Neault | oakenclast@gmail.com | (510) 299 0669 | Electricians | Mi Wuk Village · Tuolumne County | — | — |
| New Green Earth Tree Care Inc. | New Green Earth Tree Care Inc. | — | (760) 550-7341 | Tree | Bonsall · Tuolumne County | — | — |
| Newkirk's Plumbing | Michael Dale Newkirk | — | (209) 770 6050 | HVAC | Sonora · Tuolumne County | — | — |
| Nick Chase Pest Control Inc. | Nick Chase Pest Control Inc. | — | (209) 591-0184 | Pest, tile roofs | Sonora · Tuolumne County | — | — |
| Nick Yates Drywall | Nick Yates Drywall | — | (209) 770 4619 | Other | Sonora · Tuolumne County | — | — |
| Njirich & Sons INC | Kasey Leigh Njirich | — | (209) 533 2268 | Other | Sonora · Tuolumne County | — | — |
| Nolte Heating And Cooling | Nolte Heating And Cooling | — | (209) 928 9773 | HVAC | Tuolumne · Tuolumne County | — | — |
| Nugent Construction | Arthur Dale Nugent | — | (209) 770 1599 | GC, remodel, ADU | Soulsbyville · Tuolumne County | — | — |
| O J C Construction | Olaf James Cathrein | — | (209) 840 2232 | GC, remodel, ADU | Groveland · Tuolumne County | — | — |
| O'reilly T Construction | Tyler Nicolan O'reilly | — | (209) 352 0168 | GC, remodel, ADU | Sonora · Tuolumne County | — | — |
| Olsen Investments INC DBA Olsen Excavation & Grading | Roger Stephen Olsen | — | (209) 533 8347 | Other | Sonora · Tuolumne County | — | — |
| Optimized Plumbing & Piping INC | Curtis Anthony Mcquinn | — | (209) 743 9821 | HVAC | Sonora · Tuolumne County | — | — |
| Osterhout Construction | Jesse Mathew Willi Osterhout | — | (209) 768 0352 | HVAC | Jamestown · Tuolumne County | — | — |
| Otto B Plumbing | Otto B Plumbing | — | (209) 559 8890 | Other | Jamestown · Tuolumne County | — | — |
| P H Electric | Paul Harvey Sr Holzberger | — | (209) 559 1027 | Electricians | Soulsbyville · Tuolumne County | — | — |
| P S C Builders | P S C Builders | — | (209) 770 0969 | GC, remodel, ADU | Sonora · Tuolumne County | — | — |
| Pacific Construction Management | Gregory Alan Barclay | — | (209) 540 7886 | GC, remodel, ADU | Sonora · Tuolumne County | — | — |
| Pacific Development Construction | Douglas James Williams | — | (805) 698 5807 | GC, remodel, ADU | Groveland · Tuolumne County | — | — |
| Pacific Mountain Environmental & Construction | Jason Preston Sandoval | — | (209) 614 9452 | Other | Sonora · Tuolumne County | — | — |
| Paintmasters | Edward Leroy Steinhoefel | — | (209) 200 7712 | Windows, patio, painters | Columbia · Tuolumne County | — | — |
| Paintmasters Plus | Paintmasters Plus | — | (925) 366-1709 | Windows, patio, painters | Sonora · Tuolumne County | — | — |
| Paul T Sutton | Paul T Sutton | — | (209) 352 4349 | Other | Sonora · Tuolumne County | — | — |
| Peace Of Mind Construction | Douglas Judson Coke | — | (209) 586 2999 | GC, remodel, ADU | Twain Harte · Tuolumne County | — | — |
| Peak Construction | John Eugene Pike | — | (209) 768 1633 | Other | Groveland · Tuolumne County | — | — |