| Monarch Roofing INC | Jason Alexander Jongeneelen | — | (657) 377 7508 | Other roofers | Menifee · Riverside County | — | — |
| Monca Construction | Moncada Cesar | — | (909) 975 1381 | GC, remodel, ADU | Moreno Valley · Riverside County | — | — |
| Moncada INC | Robert Moncada | — | (951) 339 0431 | Other | Corona · Riverside County | — | — |
| Mondragon's Landscaping LLC | Mario Cleofas Cardona Rodriguez | — | (951) 220 3355 | Windows, patio, painters | San Jacinto · Riverside County | — | — |
| Monica Tile | Andrew| Monica Andy Monica | — | (760) 360 7020 | GC, remodel, ADU | Thousand Palms · Riverside County | — | — |
| Monjes Construction | Jose Guadalupe Monje | — | (760) 272 4616 | GC, remodel, ADU | Palm Desert · Riverside County | — | — |
| Monroy Industries | Jose Luis Monroy | — | (951) 478 6003 | Windows, patio, painters | Moreno Valley · Riverside County | — | — |
| Monroy's Custom Painting | Ernesto Monroy | — | (951) 357 3148 | Windows, patio, painters | Hemet · Riverside County | — | — |
| Monster Electric | Ronald Lawrence Moore | — | (951) 204 4664 | Electricians | Riverside · Riverside County | — | — |
| Monster Painting | Kim Young Jin | tommy@monsterpainting.com | (951) 377 2525 | Windows, patio, painters | Riverside · Riverside County | — | — |
| Montano Excavation LLC | Blake Auston Montano | — | (951) 821 0386 | Other | Menifee · Riverside County | — | — |
| Montano's Painting Company | Perez Maximo Montano | info@montanospainting.com | (714) 776 8343 | Windows, patio, painters | Riverside · Riverside County | — | — |
| Montano's Painting INC | Dong Hoon Shin | info@montanospainting.com | (714) 776 8364 | Windows, patio, painters | Menifee · Riverside County | — | — |
| Montella Electric INC | Thomas Dominic Montella | — | (909) 228 6365 | Electricians | Corona · Riverside County | — | — |
| Monteon Electric | Monteon Ramon | — | (951) 283 5739 | Electricians | Norco · Riverside County | — | — |
| Montes Fencing INC | Deniz Salvador Montes | — | (951) 259 7688 | Other | Romoland · Riverside County | — | — |
| Montez Landscaping | Montez Landscaping | — | (760) 902 3858 | Windows, patio, painters | Thousand Palms · Riverside County | — | — |
| Montgomery Plumbing INC | Mark Lee Montgomery | — | (951) 453 9505 | Other | Moreno Valley · Riverside County | — | — |
| Montonella Landscape | Victor Hugo Torres Diaz | — | (760) 409 9276 | Windows, patio, painters | Thousand Palms · Riverside County | — | — |
| Montoya Marble & Granite | Montoya Marble & Granite | — | (951) 807 7710 | Other | Riverside · Riverside County | — | — |
| Montoyas Construction | Belmontes Adan Orozco | — | (951) 965 4851 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Moody Masonry & Concrete | Moody Masonry & Concrete | — | (310) 720 6017 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Moonhill Construction INC | Jason Duane Hill | — | (951) 225 2249 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| Moonlight Electric INC | Danny Joseph Bartlett | — | (760) 343 1262 | Electricians | Thousand Palms · Riverside County | — | — |
| Moore & Sons Construction | Christopher Scott Moore | — | (951) 867 2168 | GC, remodel, ADU | Beaumont · Riverside County | — | — |
| Moore Construction | Lawrence Wayne Moore | — | (951) 845 1285 | GC, remodel, ADU | Beaumont · Riverside County | — | — |
| Moore Dvbe Construction Supply | Matthew George Moore | — | (951) 712 0695 | Electricians | Norco · Riverside County | — | — |
| Moore Electric | Gregory Smith Moore | interested@domainmarket.com | (562) 706 5291 | Electricians | Riverside · Riverside County | — | — |
| Moore Fence & Installation Company INC | Jacob Ray Moore | — | (909) 272 0945 | GC, remodel, ADU | Perris · Riverside County | — | — |
| Moore Landscaping | Moore Landscaping | — | (909) 214 9516 | Windows, patio, painters | Riverside · Riverside County | — | — |
| Moore Power Solutions LLC | Blake Aldrigde Moore | — | (951) 813 8385 | Electricians | Menifee · Riverside County | — | — |
| Moore's Heating & Air Conditioning | Moore's Heating & Air Conditioning | — | (951) 837 9897 | HVAC | Aguanga · Riverside County | — | — |
| Moose Electric | Moose Omanovic | — | (760) 831 7182 | Electricians | Palm Springs · Riverside County | — | — |
| Mora Bejar Concrete | Jose Luis Mora Bejar | — | (951) 556 9526 | Other | Riverside · Riverside County | — | — |
| Mora C E | Mora C E | mail@morace.com | (951) 797 9113 | Electricians | Murrieta · Riverside County | — | — |
| Mora Custom Concrete INC | Armando Mora | — | (909) 644 5778 | Other | Riverside · Riverside County | — | — |
| Mora's Construction | Mora Reyes Andres | — | (714) 721 6028 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Moracala Custom Patio Covers | Moracala Custom Patio Covers | — | (714) 724 2728 | Other | Lake Elsinore · Riverside County | — | — |
| Morair Air Conditioning & Heating | Morair Air Conditioning & Heating | — | (760) 296 2727 | HVAC | Indio · Riverside County | — | — |
| Moran Electric Service | Moran Antonio | — | (619) 571 4026 | Electricians | Menifee · Riverside County | — | — |