- Machinery And Equipment Manufacturers, Oakland
- Machinery Custom Design Manufacturers, Oakland
- Machinery, Supplies & Equipment - Business Production Related, Oakland
- Machinery, Supplies & Equipment - Business Supplies Related, Oakland
- Machinery, Supplies & Equipment - Construction & Contractor Related, Oakland
- Management Consultants & Services, Oakland
- Manicurists & Pedicurists, Oakland
- Manufacturing, Oakland
- Manufacturing Products, Oakland
- Marine Contractors & Designers, Oakland
- Masonry Contractors, Oakland - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Oakland
- Massage Therapy, Oakland
- Material Handling Equipment, Oakland - Conveyor Belt, Pallet Jack, Forklift, etc
- Medical Records Service , Oakland
- Medical Supplies & Equipment, Oakland
- Men's Clothing Stores, Oakland - Clothes & Accessories
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- Mental Health Specialists, Oakland - Psychologist, Psychiatrist, Psychotherapist, etc
- Mini & Self Storage, Oakland
- Mining, Oakland
- Miscellaneous Business Product Repair, Oakland
- Miscellaneous Household Item Repair, Oakland
- Miscellaneous Business Services, Oakland
- Miscellaneous Government, Oakland
- Miscellaneous Personal Services, Oakland
- Miscellaneous Professional, Oakland
- Mortgage Bankers & Correspondents, Oakland
- Motor Vehicle, Oakland
- Motor Vehicle Rental & Leasing, Oakland
- Moving Companies, Oakland
- Music, Oakland
- Musical Instrument Rental, Oakland - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Oakland
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