- Machine Shop, Oakley
- Machine Shop & Tool Repair Service, Oakley
- Machinery, Supplies & Equipment - Business Production Related, Oakley
- Machinery, Supplies & Equipment - Construction & Contractor Related, Oakley
- Mailbox Rental Services, Oakley
- Mailing, Delivery & Courier Service, Oakley
- Management Consultants & Services, Oakley
- Manicurists & Pedicurists, Oakley
- Manufacturing, Oakley
- Manufacturing Products, Oakley
- Marinas & Marina Services, Oakley
- Martial Arts & Self Defense Schools, Oakley
- Masonry Materials & Supplies, Oakley
- Massage Therapy, Oakley
- Meat Market, Wholesale & Products, Oakley
- Membership Sports & Recreation Clubs, Oakley
- Men's & Boys Clothing & Accessories Stores, Oakley
- Mens & Boys Jeans & Western Wear Stores, Oakley
- Metal Repair Service & Blacksmith, Oakley - Iron Works
- Metal Roofs, Oakley
- Mexican Food, Oakley
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- Mexican Restaurants, Oakley
- Mini & Self Storage, Oakley
- Miscellaneous Business Services, Oakley
- Miscellaneous Government, Oakley
- Miscellaneous Industry, Oakley
- Miscellaneous Personal Services, Oakley
- Miscellaneous Professional, Oakley
- Mobile Home Contractors, Oakley
- Mobile Home Improvements & Repairs, Oakley
- Mobile Home Parks & Communities , Oakley
- Motor Vehicle, Oakley
- Motor Vehicle Rental & Leasing, Oakley
- Motorcycle & Motor Scooters Dealers, Repair & Service, Oakley
- Motorcycle Repair & Service, Oakley
- Moving & Storage Supplies & Equipment, Oakley
- Moving Companies, Oakley
- Moving Truck Rental , Oakley
- Music, Oakley
- Music Lessons, Oakley
- Music Lessons - Instrumental, Oakley
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