- Machinery, Supplies & Equipment - Business Production Related, Copperopolis
- Machinery, Supplies & Equipment - Business Supplies Related, Copperopolis
- Machinery, Supplies & Equipment - Construction & Contractor Related, Copperopolis
- Mail Delivery Service, Copperopolis
- Management Consultants & Services, Copperopolis
- Manicurists & Pedicurists, Copperopolis
- Manufacturing, Copperopolis
- Marinas & Marina Services, Copperopolis
- Marine Supplies & Equipment, Copperopolis - Boat Supplies
- Mental Health Clinics, Copperopolis - Treatment Centers
- Metal Repair Service & Blacksmith, Copperopolis - Iron Works
- Mexican Restaurants, Copperopolis
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- Mini & Self Storage, Copperopolis
- Mining, Copperopolis
- Mining Contractors, Copperopolis - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, Copperopolis - Mining Companies
- Miscellaneous Business Product Repair, Copperopolis
- Miscellaneous Business Services, Copperopolis
- Miscellaneous Government, Copperopolis
- Miscellaneous Personal Services, Copperopolis
- Mortgage Bankers & Correspondents, Copperopolis
- Motor Vehicle, Copperopolis
- Motor Vehicle Rental & Leasing, Copperopolis
- Moving Truck Rental , Copperopolis
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