- Machine Shop & Tool Repair Service, Maynardville
- Machinery, Supplies & Equipment - Business Supplies Related, Maynardville
- Management Consultants & Services, Maynardville
- Manufacturers Agents & Representatives, Maynardville
- Manufacturers Representative, Maynardville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Maynardville
- Marinas & Marina Services, Maynardville
- Marriage & Family Counselors, Maynardville
- Masonry Materials & Supplies, Maynardville
- Meat Packers, Maynardville
- Mental Health Clinics, Maynardville - Treatment Centers
- Mental Health Specialists, Maynardville - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Buildings, Maynardville - Kits, Homes, Steel Buildings, etc
- Mexican Restaurants, Maynardville
- Mining, Maynardville
- Mining Contractors, Maynardville - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, Maynardville - Mining Companies
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- Miscellaneous Government, Maynardville
- Miscellaneous Manufacturing, Maynardville
- Miscellaneous Professional, Maynardville
- Mission Churches, Maynardville
- Mobile Homes, Maynardville
- Mobile Homes Manufactures, Maynardville
- Modular & Mobile Homes For Sale, Maynardville - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Maynardville
- Mortgage Bankers & Correspondents, Maynardville
- Motor Vehicle, Maynardville
- Motor Vehicle Rental & Leasing, Maynardville
- Moving Supplies & Equipment Rental, Maynardville
- Moving Truck Rental , Maynardville
- Muffler Shop & Exhaust Systems, Maynardville
- Museums, Maynardville
- Music, Maynardville
- Musical Instruments & Equipment Stores, Maynardville
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