- Mecca (88 Companies)
- Mendocino (144 Companies)
- Mendota (320 Companies)
- Menifee (2,598 Companies)
- Menlo Park (3,824 Companies)
- Mentone (302 Companies)
- Merced (5,661 Companies)
- Meridian (39 Companies)
- Meyers (4 Companies)
- Mi Wuk Village (33 Companies)
- Middletown (302 Companies)
- Midpines (38 Companies)
- Midway City (219 Companies)
- Milford (4 Companies)
- Mill Creek (4 Companies)
- Mill Valley (3,413 Companies)
- Millbrae (1,380 Companies)
- Millersville (2 Companies)
- Millville (42 Companies)
- Milpitas (5,310 Companies)
- Mineral (2 Companies)
- Mira Loma (1,867 Companies)
- Mira Mesa (1 Company)
- Miramonte (19 Companies)
- Miranda (14 Companies)
- Mission Hills (1,361 Companies)
- Mission Viejo (5,813 Companies)
- Modesto (19,641 Companies)
- Mojave (495 Companies)
- Mokelumne Hill (87 Companies)
- Monarch Beach (2 Companies)
- Mono Hot Springs (2 Companies)
- Monrovia (3,372 Companies)
- Montague (149 Companies)
- Montara (38 Companies)
- Montclair (3,409 Companies)
- Monte Rio (59 Companies)
- Monte Sereno (24 Companies)
- Montebello (4,380 Companies)
- Montecito (31 Companies)
- Monterey (5,849 Companies)
- Monterey Park (3,638 Companies)
- Montgomery Creek (8 Companies)
- Montrose (1,029 Companies)
- Moorpark (2,200 Companies)
- Morada (1 Company)
- Moraga (712 Companies)
- Moreno Valley (6,463 Companies)
- Morgan Hill (3,907 Companies)
- Morongo Valley (123 Companies)
- Morro Bay (1,372 Companies)
- Moss Beach (132 Companies)
- Moss Landing (159 Companies)
- Mount Aukum (9 Companies)
- Mount Baldy (4 Companies)
- Mount Hamilton (10 Companies)
- Mount Hermon (5 Companies)
- Mount Laguna (3 Companies)
- Mount Shasta (896 Companies)
- Mountain Center (54 Companies)
- Mountain House (31 Companies)
- Mountain Mesa (36 Companies)
- Mountain Ranch (61 Companies)
- Mountain View (6,004 Companies)
- Muir Beach (30 Companies)
- Murphys (699 Companies)
