- Machine Shop & Tool Repair Service, Oakland
- Machinery, Supplies & Equipment - Business Supplies Related, Oakland
- Machinery, Supplies & Equipment - Construction & Contractor Related, Oakland
- Mail Delivery Service, Oakland
- Mailing, Delivery & Courier Service, Oakland
- Major Appliances, Oakland - Household & Kitchen
- Management Consultants & Services, Oakland
- Manicurists & Pedicurists, Oakland
- Manufacturing, Oakland
- Manufacturing Products, Oakland
- Marinas & Marina Services, Oakland
- Marine Products And Services, Oakland
- Marine Services, Oakland
- Marine Supplies & Equipment, Oakland - Boat Supplies
- Marriage & Family Counselors, Oakland
- Masonry Materials & Supplies, Oakland
- Massage Therapists & Professional, Oakland
- Massage Therapy, Oakland
- Meat Market, Wholesale & Products, Oakland
- Medical Supplies & Equipment, Oakland
- Membership Sports & Recreation Clubs, Oakland
- Men's Clothing Stores, Oakland - Clothes & Accessories
- Mental Health Specialists, Oakland - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Oakland
- Methodist Church, Oakland
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- Mexican Restaurants, Oakland
- Millwork Contractors, Oakland
- Mini & Self Storage, Oakland
- Mining, Oakland
- Mining Consultants, Oakland
- Mining Equipment & Supplies, Oakland
- Mining Equipment & Supplies Service & Repair, Oakland
- Mining Services, Oakland
- Miscellaneous Prosthesis & Appliances, Oakland
- Miscellaneous Government, Oakland
- Miscellaneous Industry, Oakland
- Miscellaneous Photographers, Oakland
- Miscellaneous Professional, Oakland
- Modular & Mobile Homes For Sale, Oakland - Manufactured Homes Sale & Service
- Moisture & Vapor Control, Oakland
- Monuments, Tombstones, Markers & Memorials, Oakland
- Mortgage Bankers & Correspondents, Oakland
- Mortgages & Loans, Oakland
- Motor Vehicle, Oakland
- Motor Vehicle Rental & Leasing, Oakland
- Motorcycle Parts, Accessories & Dealers, Oakland
- Movie Theaters, Oakland
- Moving Companies, Oakland
- Moving Truck Rental , Oakland
- Museums, Oakland
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