| Mike Zibell Construction | Michael Alan Zibell | — | (951) 845 4812 | GC, remodel, ADU | Beaumont · Riverside County | — | — |
| Mike's Landscaping | Mike's Landscaping | — | (951) 322 7224 | Windows, patio, painters | Menifee · Riverside County | — | — |
| Mike's Precision Welding INC | Michael Hase Prunty | — | (909) 676 4744 | Other | Temecula · Riverside County | — | — |
| Mikey's A/c & Heating | Mike Torres | — | (760) 835 3792 | HVAC | Indio · Riverside County | — | — |
| Mikho Construction INC | Iven Esho Mikho | — | (619) 995 0715 | GC, remodel, ADU | Menifee · Riverside County | — | — |
| Miko Mountain Lion INC | Michael Nicholas Jr Monteleone | — | (951) 852 5006 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| Milagro Landscape Company | Michael Anthony Pino | angelayala@gmail.com | (951) 312 0238 | Windows, patio, painters | Riverside · Riverside County | — | — |
| Milato Construction INC | Jay Jihad Maroun | info@milatoconstruction.com | (951) 315 5104 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Miles Audio & Video | Miles Audio & Video | — | (951) 450 1873 | Other | Lake Elsinore · Riverside County | — | — |
| Millan Grading | Alejandro Millan Arzate | — | (951) 440 9572 | Other | Riverside · Riverside County | — | — |
| Millar Heating & Air | Millar Heating & Air | — | (951) 679 1331 | HVAC | Menifee · Riverside County | — | — |
| Millenium Artificial Turf | Millenium Artificial Turf | — | (909) 497 9869 | Windows, patio, painters | Perris · Riverside County | — | — |
| Millenium Construction LLC | Carlos Joel Soto Lorenzo | — | (801) 860 2213 | GC, remodel, ADU | Hemet · Riverside County | — | — |
| Millenium Flooring | Millenium Flooring | — | (951) 283 6333 | Other | Riverside · Riverside County | — | — |
| Millennial Windows And Glass Doors INC | Albert Plancarte | — | (949) 520 9955 | Windows, patio, painters | Riverside · Riverside County | — | — |
| Millennium Landscape | Millennium Landscape | — | (951) 412 8051 | Windows, patio, painters | Winchester · Riverside County | — | — |
| Millennium Painting | Millennium Painting | — | (951) 756 9935 | Windows, patio, painters | Riverside · Riverside County | — | — |
| Millennium Stone & Tile INC | Richard Carrazana Rivas | — | (760) 238 8220 | Other | Coachella · Riverside County | — | — |
| Millennium Tile | Millennium Tile | — | (760) 644 3712 | Other | Anza · Riverside County | — | — |
| Millennium Tile Designs | Millennium Tile Designs | — | (951) 956 4780 | Other | Beaumont · Riverside County | — | — |
| Miller Blades INC | Darren James Miller | — | (909) 985 7704 | Other | Riverside · Riverside County | — | — |
| Miller Electric | Justin Roen Miller | — | (760) 831 6960 | Electricians | Indio · Riverside County | — | — |
| Miller Painting | Miller Painting | — | (760) 831 0928 | Windows, patio, painters | Palm Springs · Riverside County | — | — |
| Miller Precision Construction | Douglas Matthew Miller | — | (951) 258 6730 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| Miller Regional Management INC | Jake Alexander Miller | — | (951) 331 9051 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| Millers Heating And Cooling | Jeremy Scott Miller | — | (760) 807 7570 | HVAC | Cathedral City · Riverside County | — | — |
| Millestone Marble & Tile INC | Mark Cameron De Mille | — | (760) 341 7525 | Other | Thousand Palms · Riverside County | — | — |
| Million's Flooring | Million's Flooring | — | (951) 491 4174 | Other | Moreno Valley · Riverside County | — | — |
| Mills 1 Electric | Derick Tyrone Mills | — | (951) 325 3666 | Electricians | Hemet · Riverside County | — | — |
| Mills Air Conditioning & Heating INC | Victor Alan Burull | — | (951) 689 8727 | HVAC | Riverside · Riverside County | — | — |
| Mills Brothers Climate Control LLC | Rylan Timothy Mills | — | (760) 880 5275 | HVAC | Blythe · Riverside County | — | — |
| Mills Custom Services | Richard Carl Mills | — | (760) 250 1890 | GC, remodel, ADU | Rancho Mirage · Riverside County | — | — |
| Millsten Enterprises INC | Gregory Edward Mills | — | (951) 238 8666 | Windows, patio, painters | Nuevo · Riverside County | — | — |
| Minas Heating And Air Conditioning | Minas Heating And Air Conditioning | — | (951) 531 6409 | HVAC | Menifee · Riverside County | — | — |
| Minden Corporation DBA Minden Storm Drain Structures | Joseph Frank Cooper | — | (951) 245 4226 | Other | Lake Elsinore · Riverside County | — | — |
| Ming Choo DBA Reel Climate Solutions | Reel Climate Solutions | — | (213) 800 3210 | HVAC | Riverside · Riverside County | — | — |
| Mini Repair Company | Mark Adam Pickard | — | (951) 206 4831 | Other | Riverside · Riverside County | — | — |
| Mini Split King Air Conditioning | Mini Split King Air Conditioning | — | (760) 625 3095 | HVAC | Indio · Riverside County | — | — |
| Mining & Development Management INC | Patricia Lourine Yates-Marx | — | (949) 933 9964 | Other | Murrieta · Riverside County | — | — |
| Minuteman Plumbing And Drain Services | Gerhard Martin Kiessling | — | (714) 590 3800 | Other | Corona · Riverside County | — | — |