| Mapes Construction | James Lee Mapes | — | (951) 543 3776 | GC, remodel, ADU | Perris · Riverside County | — | — |
| Maples & Associates INC | Michael Paul Maples | — | (951) 304 3311 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| Mar - Temp | Mar - Temp | — | (951) 695 2516 | HVAC | Temecula · Riverside County | — | — |
| Mar Construction | Martinez Ramon | — | (714) 580 7149 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Mar Vet Electrical | Raquel Monique Gomez | — | (442) 402 9496 | Electricians | Desert Hot Springs · Riverside County | — | — |
| Mar-tin Companies INC | David Angel Martinez | — | (951) 941 9492 | Other | Mira Loma · Riverside County | — | — |
| Marabunta Pools | Marabunta Pools | — | (760) 625 8870 | Pool | Coachella · Riverside County | — | — |
| Marana Construction | Elias Carl Marana | — | (951) 905 8123 | GC, remodel, ADU | Hemet · Riverside County | — | — |
| Marathon Coatings INC | Isaac Curtis Coons | — | (858) 935 0787 | Windows, patio, painters | Hemet · Riverside County | — | — |
| Marathon Finishing Systems Equiptment | Christian Victor Rerucha | — | (310) 963 9035 | Other | Temecula · Riverside County | — | — |
| Marbel Pools | Marco Isaias Gonzalez Cardenas | — | (949) 375 6817 | Pool | Winchester · Riverside County | — | — |
| Marblelife Of Los Angeles | Keith Richard Devries | — | (562) 544 3917 | Other | Riverside · Riverside County | — | — |
| Marc AC Specialized Corp | Martin Adrian Reyes | — | (760) 578 1240 | HVAC | Thermal · Riverside County | — | — |
| Marc Oliver Pools | Marc Oliver Pools | — | (541) 310 2507 | Pool | Romoland · Riverside County | — | — |
| Marcelino A Rojas | Marcelino A Rojas | — | (562) 371 4357 | Windows, patio, painters | Banning · Riverside County | — | — |
| Marcelino Mendoza | Marcelino Mendoza | — | (562) 925 3164 | Windows, patio, painters | Corona · Riverside County | — | — |
| Marcello Viola | Marcello Viola | — | (951) 928 7707 | Windows, patio, painters | Nuevo · Riverside County | — | — |
| Marcelos Trenching INC | Luis Alberto Marcelo Ramirez | — | (951) 610 6919 | Other | Perris · Riverside County | — | — |
| Marchan Landscaping | Marchan Landscaping | — | (951) 823 6720 | Windows, patio, painters | Perris · Riverside County | — | — |
| Marcio Paz | Marcio Paz | — | (626) 324 8980 | Other | Riverside · Riverside County | — | — |
| Marco A Nogues | Marco A Nogues | — | (442) 202 9244 | Pool | La Quinta · Riverside County | — | — |
| Marco A Perez | Marco A Perez | — | (951) 204 2379 | Windows, patio, painters | Corona · Riverside County | — | — |
| Marco Antonio Mares | Marco Antonio Mares | — | (562) 577 3175 | Windows, patio, painters | Lake Elsinore · Riverside County | — | — |
| Marco Cesar Trillo Rodriguez | Marco Cesar Trillo Rodriguez | — | (951) 395 9261 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| Marco Salvador LLC | Marco Antonio Salvador | — | (714) 222 5063 | Other | Riverside · Riverside County | — | — |
| Marcos Pedraza Gil | Marcos Pedraza Gil | — | (949) 351 2173 | Other | Riverside · Riverside County | — | — |
| Marcos Perales | Marcos Perales | — | (760) 574 3530 | Pool | La Quinta · Riverside County | — | — |
| Marcos Perez | Marcos Perez | — | (951) 491 5685 | Other | Murrieta · Riverside County | — | — |
| Marcus Williams | Marcus Williams | — | (951) 566 5939 | Other | Menifee · Riverside County | — | — |
| Marenko Epoxy Coatings | Marenko Epoxy Coatings | — | (657) 201 0322 | Other | Hemet · Riverside County | — | — |
| Marginx Custom Woodworking | Marginx Custom Woodworking | — | (714) 932 2716 | Other | Lake Elsinore · Riverside County | — | — |
| Maria & Oscar Roofing LLC | Jose Luis Arizmendi Acosta | — | (626) 866 2510 | Other roofers | Riverside · Riverside County | — | — |
| Maria Carole Yeakel DBA Springs Painting | Springs Painting | — | (760) 774 7172 | Windows, patio, painters | Thousand Palms · Riverside County | — | — |
| Maria Del C Flores De Olmos | Maria Del C Flores De Olmos | — | (760) 883 8769 | Other | Coachella · Riverside County | — | — |
| Mariano Fusco | Mariano Fusco | — | (949) 525 0987 | GC, remodel, ADU | Corona · Riverside County | — | — |
| Mariano's Landscape | Mariano's Landscape | — | (909) 327 6301 | Windows, patio, painters | Moreno Valley · Riverside County | — | — |
| Marin Air LLC | Wayne Joseph Marin | sales@marinr.nl | (951) 897 4173 | HVAC | Riverside · Riverside County | — | — |
| Marin Concrete Construction INC | Marin Ivan | — | (951) 830 2569 | Other | Perris · Riverside County | — | — |
| Marina's Painting | Amalia Marina Florian | — | (714) 227 1341 | Windows, patio, painters | Jurupa Valley · Riverside County | — | — |
| Mario A Yanez Construction | Mario Antonio Yanez | — | (760) 285 1532 | GC, remodel, ADU | North Palm Springs · Riverside County | — | — |