| Martin Xavier Reyes | Martin Xavier Reyes | — | (209) 605 4079 | Other | Winton · Merced County | — | — |
| Martinez Construction | Mark Randolph Martinez | — | (209) 777 3397 | GC, remodel, ADU | Merced · Merced County | — | — |
| Martinez Heating & Air Conditioning INC | Jorge Cesareo Martinez | — | (209) 658 9947 | HVAC | Merced · Merced County | — | — |
| Marvin Friesen Painting | Marvin Friesen Painting | — | (209) 777 3993 | Windows, patio, painters | Livingston · Merced County | — | — |
| Marvin Neese Construction Company | Marvin Eugene Neese | — | (209) 678 0217 | GC, remodel, ADU | Hilmar · Merced County | — | — |
| Marvin Sommers | Marvin Sommers | — | (209) 756 3131 | GC, remodel, ADU | Livingston · Merced County | — | — |
| Marvulli | David Christopher Marvulli | info@marvulli.com | (209) 233 9474 | GC, remodel, ADU | Merced · Merced County | — | — |
| Marwell Landscape | Marwell Landscape | sales@marwelllandscape.com | (209) 777 4099 | Windows, patio, painters | Merced · Merced County | — | — |
| Mascorro Flooring | Mascorro Flooring | — | (209) 996 4522 | Other | Merced · Merced County | — | — |
| Master Finish Carpentry | Master Finish Carpentry | — | (209) 233 1160 | Other | Merced · Merced County | — | — |
| Master Pro Plumbing INC | Juan Martinez Lucas | — | (831) 676 8437 | Other | Los Banos · Merced County | — | — |
| Mauricio Fernandez | Mauricio Fernandez | — | (209) 675 2531 | Other | Los Banos · Merced County | — | — |
| Mauzy Electrical | Glen Edward Mauzy | — | (209) 587 0024 | Electricians | Merced · Merced County | — | — |
| Maxwell Construction Incorporated | Margaret Cullen Maxwell | — | (209) 383 6145 | GC, remodel, ADU | Merced · Merced County | — | — |
| Maxwell Homes | Maxwell Homes | — | (209) 722-0745 | Property managers | Merced · Merced County | — | — |
| May Irrigation INC | Todd Leon May | — | (209) 777 3334 | Other | Atwater · Merced County | — | — |
| Maybee's Welding | Maybee's Welding | — | (209) 613 3355 | Other | Stevinson · Merced County | — | — |
| Mayridge Construction LLC | Jeffrey Herbert May | — | (209) 777 0740 | GC, remodel, ADU | Merced · Merced County | — | — |
| Mb Framing | Mb Framing | — | (209) 493 0646 | Other | Delhi · Merced County | — | — |
| Mc Construction Pro | Perales Michael | — | (858) 436 4616 | GC, remodel, ADU | Merced · Merced County | — | — |
| Mc Kenzie Enterprizes | Mc Kenzie Enterprizes | — | (209) 216 8158 | Other | Ballico · Merced County | — | — |
| Mc Modern Restorations | Mc Modern Restorations | — | (704) 438-8765 | Restoration | Vista · Merced County | — | — |
| Mcelvany INC | Ashley Mcelvany Hupman | — | (209) 826 1102 | Other | Los Banos · Merced County | — | — |
| Meehan Construction | Robert Allen Meehan | — | (209) 658 4721 | GC, remodel, ADU | Atwater · Merced County | — | — |
| Mejia Co Construction LLC | Juan Carlos Ramirez | — | (209) 276 9701 | GC, remodel, ADU | Livingston · Merced County | — | — |
| Mejia Mechanical LLC | Josue David Mejia Melgar | mejiamechanical@mejiamechanical.com | (408) 401 0863 | HVAC | Dos Palos · Merced County | — | — |
| Mendonca Services INC | Jeffery Robert Mendonca | — | (209) 495 8116 | Electricians | Hilmar · Merced County | — | — |
| Meraz Construction | Juan Antonio Meraz Ramos | — | (209) 277 0476 | GC, remodel, ADU | Delhi · Merced County | — | — |
| Mercado Construction | Mercado Manuel | — | (209) 678 0596 | HVAC | Delhi · Merced County | — | — |
| Merced Alarm Co | Merced Alarm Co | — | (209) 726-8000 | Alarm and generators | Merced · Merced County | — | — |
| Merced Building Inspections | Merced Building Inspections | — | (209) 385-6861 | Inspectors | Merced · Merced County | — | — |
| Merced City Animal Control. | Merced City Animal Control. | — | (209) 385-4720 | Pest, tile roofs | Merced · Merced County | — | — |
| Merced County Builders Corp | Flor-Einstein Valentin Cabalteja | info@mercedcountrybuilders.com | (209) 704 4704 | GC, remodel, ADU | Los Banos · Merced County | — | — |
| Merced County Community Action Agency | Roy Cook | — | (209) 381 5282 | GC, remodel, ADU | Merced · Merced County | — | — |
| Merced County Health Inspections | Merced County Health Inspections | — | (209) 381-1100 | Inspectors | Merced · Merced County | — | — |
| Merced Electric Company INC | Gustavo R Reyes | — | (209) 325 4806 | Electricians | Merced · Merced County | — | — |
| Merced Fence Company | Justin David Ray Pasley | — | (209) 383 9399 | Other | Atwater · Merced County | — | — |
| Merced Garage Doors | Merced Garage Doors | — | (209) 756 6345 | Other | Merced · Merced County | — | — |
| Merced Multicultural Arts Center | Merced Multicultural Arts Center | — | (209) 388-1090 | Windows, patio, painters | Merced · Merced County | — | — |
| Merced Pest Control | Merced Pest Control | mercedpest@yahoo.com | (209) 383-7014 | Pest, tile roofs | Merced · Merced County | — | — |