- Machine Shop & Tool Repair Service, Castro Valley
- Machinery Movers & Erectors, Castro Valley
- Machinery, Supplies & Equipment - Business Production Related, Castro Valley
- Machinery, Supplies & Equipment - Construction & Contractor Related, Castro Valley
- Mailbox Rental Services, Castro Valley
- Mailing, Delivery & Courier Service, Castro Valley
- Major Appliances, Castro Valley - Household & Kitchen
- Make Up & Cosmetics Application, Castro Valley
- Malls & Shopping Centers, Castro Valley
- Management Consultants & Services, Castro Valley
- Mandarin Restaurants, Castro Valley
- Manicurists & Pedicurists, Castro Valley
- Manufacturing, Castro Valley
- Marriage & Family Counselors, Castro Valley
- Martial Arts & Self Defense Schools, Castro Valley
- Masonry Contractors, Castro Valley - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Castro Valley
- Massage Therapy, Castro Valley
- Medical & Dental Management, Castro Valley
- Medical & Health Service Organizations, Castro Valley
- Medical Business Management Services, Castro Valley
- Medical Management & Business Administration Service, Castro Valley
- Medical Supplies & Equipment, Castro Valley
- Membership Sports & Recreation Clubs, Castro Valley
- Mental Health Clinics, Castro Valley - Treatment Centers
- Mental Health Specialists, Castro Valley - Psychologist, Psychiatrist, Psychotherapist, etc
- Merle Norman Cosmetics, Castro Valley
- Metal Repair Service & Blacksmith, Castro Valley - Iron Works
- Methodist Church, Castro Valley
- Mexican Restaurants, Castro Valley
- Microwave Oven Repair & Service, Castro Valley
- Middle Eastern Restaurants, Castro Valley
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- Mini & Self Storage, Castro Valley
- Mini Golf Courses, Castro Valley
- Ministries Church, Castro Valley
- Miscellaneous Business Product Repair, Castro Valley
- Miscellaneous Business Services, Castro Valley
- Miscellaneous Government, Castro Valley
- Miscellaneous Personal Services, Castro Valley
- Miscellaneous Photographers, Castro Valley
- Miscellaneous Professional, Castro Valley
- Mobile Home Parks & Communities , Castro Valley
- Money Transfer Service, Castro Valley
- Mortgage Bankers & Correspondents, Castro Valley
- Mortgage Companies, Castro Valley
- Mortgages & Loans, Castro Valley
- Motion Picture & Television Production Services, Castro Valley
- Motion Picture Dists & Producers, Castro Valley
- Motion Picture Pre & Post Production Services, Castro Valley
- Motivational & Self Improvement Schools, Castro Valley
- Motor Vehicle, Castro Valley
- Motor Vehicle Rental & Leasing, Castro Valley
- Movie Theaters, Castro Valley
- Moving & Storage Supplies & Equipment, Castro Valley
- Moving Companies, Castro Valley
- Moving Truck Rental , Castro Valley
- Muffler Shop & Exhaust Systems, Castro Valley
- Music, Castro Valley
- Music Lessons, Castro Valley
- Music Lessons - Instrumental, Castro Valley
- Music Lessons - Vocal, Castro Valley
- Musical Instrument Rental, Castro Valley - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Castro Valley
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