- Machine Shop, Oakland
- Machine Shop & Tool Repair Service, Oakland
- Machinery, Supplies & Equipment - Business Supplies Related, Oakland
- Machinery, Supplies & Equipment - Construction & Contractor Related, Oakland
- Manufacturing, Oakland
- Manufacturing Products, Oakland
- Masonry Contractors, Oakland - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Oakland
- Massage Therapy, Oakland
- Mechanical Contractors, Oakland - Install, Service & Repair
- Medical Billing Services, Oakland
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- Midwives, Oakland
- Miscellaneous Government, Oakland
- Miscellaneous Industry, Oakland
- Miscellaneous Personal Services, Oakland
- Modular & Mobile Homes For Sale, Oakland - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Oakland
- Mortgage Bankers & Correspondents, Oakland
- Motor Vehicle, Oakland
- Motorcycle & Motor Scooters Dealers, Repair & Service, Oakland
- Motorcycle Parts, Accessories & Dealers, Oakland
- Motorcycle Repair & Service, Oakland
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