- Machine Shop, Clarksville
- Machinery, Supplies & Equipment - Business Supplies Related, Clarksville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Clarksville
- Mail Delivery Service, Clarksville
- Major Appliances, Clarksville - Household & Kitchen
- Malls & Shopping Centers, Clarksville
- Management Consultants & Services, Clarksville
- Manicurists & Pedicurists, Clarksville
- Manufacturers Agents & Representatives, Clarksville
- Manufacturers Representative, Clarksville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Clarksville
- Marinas & Marina Services, Clarksville
- Masonry Materials & Supplies, Clarksville
- Membership Sports & Recreation Clubs, Clarksville
- Men's Clothing Stores, Clarksville - Clothes & Accessories
- Mental Health Specialists, Clarksville - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Clarksville
- Mexican Restaurants, Clarksville
- Miscellaneous Household Item Repair, Clarksville
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- Miscellaneous Government, Clarksville
- Miscellaneous Industry, Clarksville
- Miscellaneous Manufacturing, Clarksville
- Miscellaneous Personal Services, Clarksville
- Miscellaneous Photographers, Clarksville
- Miscellaneous Professional, Clarksville
- Mission Churches, Clarksville
- Mobile Automobile Services, Clarksville
- Modular & Mobile Homes For Sale, Clarksville - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Clarksville
- Mortgage Companies, Clarksville
- Mortgages & Loans, Clarksville
- Motor Vehicle, Clarksville
- Motor Vehicle Rental & Leasing, Clarksville
- Moving & Storage Supplies & Equipment, Clarksville
- Moving Truck Rental , Clarksville
- Museums, Clarksville
- Music, Clarksville
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