- Machine Shop & Tool Repair Service, Clarksville
- Machinery And Equipment Manufacturers, Clarksville
- Machinery, Supplies & Equipment - Business Production Related, Clarksville
- Machinery, Supplies & Equipment - Business Supplies Related, Clarksville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Clarksville
- Mailbox Rental Services, Clarksville
- Mailing, Delivery & Courier Service, Clarksville
- Major Appliances, Clarksville - Household & Kitchen
- Management Consultants & Services, Clarksville
- Manicurists & Pedicurists, Clarksville
- Manufacturers Agents & Representatives, Clarksville
- Manufacturers Representative, Clarksville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Clarksville
- Manufacturing Products, Clarksville
- Marinas & Marina Services, Clarksville
- Marriage & Family Counselors, Clarksville
- Martial Arts & Self Defense Schools, Clarksville
- Masonry Contractors, Clarksville - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Clarksville
- Medical Supplies & Equipment, Clarksville
- Membership Sports & Recreation Clubs, Clarksville
- Mennonite Church, Clarksville
- Mental Health Clinics, Clarksville - Treatment Centers
- Mental Health Specialists, Clarksville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Clarksville
- Merle Norman Cosmetics, Clarksville
- Metal Buildings, Clarksville - Kits, Homes, Steel Buildings, etc
- Metal Repair Service & Blacksmith, Clarksville - Iron Works
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- Methodist Church, Clarksville
- Mexican Restaurants, Clarksville
- Mini & Self Storage, Clarksville
- Mirrors, Clarksville - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Services, Clarksville
- Miscellaneous Government, Clarksville
- Miscellaneous Manufacturing, Clarksville
- Miscellaneous Personal Services, Clarksville
- Miscellaneous Photographers, Clarksville
- Miscellaneous Professional, Clarksville
- Mission Churches, Clarksville
- Money Counting & Wrapping, Clarksville
- Mortgage Bankers & Correspondents, Clarksville
- Motor Vehicle, Clarksville
- Motor Vehicle Rental & Leasing, Clarksville
- Motorcycle & ATV Repair & Service, Clarksville
- Motorcycle & Motor Scooters Dealers, Repair & Service, Clarksville
- Motorcycle Parts, Accessories & Dealers, Clarksville
- Motorcycle Repair & Service, Clarksville
- Motorcycles Paint & Refinishing, Clarksville
- Movie Theaters, Clarksville
- Moving & Storage Supplies & Equipment, Clarksville
- Moving Supplies & Equipment Rental, Clarksville
- Moving Truck Rental , Clarksville
- Muffler Shop & Exhaust Systems, Clarksville
- Museums, Clarksville
- Music, Clarksville
- Musical Instruments & Equipment Stores, Clarksville
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