- Machinery, Supplies & Equipment - Business Supplies Related, Oakland
- Machinery, Supplies & Equipment - Construction & Contractor Related, Oakland
- Major Appliances, Oakland - Household & Kitchen
- Malls & Shopping Centers, Oakland
- Management Consultants & Services, Oakland
- Manicurists & Pedicurists, Oakland
- Manufacturing, Oakland
- Marine Products And Services, Oakland
- Marine Repair & Service Stations, Oakland
- Marine Supplies & Equipment Repair, Oakland - Boat Supplies & Equipment
- Martial Arts & Self Defense Schools, Oakland
- Masonry Materials & Supplies, Oakland
- Material Handling Equipment, Oakland - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, Oakland
- Mechanical Contractors, Oakland - Install, Service & Repair
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- Metal Repair Service & Blacksmith, Oakland - Iron Works
- Methodist Church, Oakland
- Mexican Restaurants, Oakland
- Ministries Church, Oakland
- Miscellaneous Business Services, Oakland
- Miscellaneous Government, Oakland
- Miscellaneous Industry, Oakland
- Miscellaneous Personal Services, Oakland
- Miscellaneous Photographers, Oakland
- Miscellaneous Professional, Oakland
- Mortgage Bankers & Correspondents, Oakland
- Motor Vehicle, Oakland
- Motor Vehicle Rental & Leasing, Oakland
- Moving Truck Rental , Oakland
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