- Machine Shop, Clarksville
- Machine Shop & Tool Repair Service, Clarksville
- Machinery And Equipment Manufacturers, Clarksville
- Machinery Custom Design Manufacturers, Clarksville
- Machinery, Supplies & Equipment - Business Supplies Related, Clarksville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Clarksville
- Mailing, Delivery & Courier Service, Clarksville
- Maintenance, Cleaning & Sanitation, Clarksville
- Major Appliances, Clarksville - Household & Kitchen
- Malls & Shopping Centers, Clarksville
- Management Consultants & Services, Clarksville
- Manicurists & Pedicurists, Clarksville
- Manufacturing, Clarksville
- Manufacturing Products, Clarksville
- Marine Products And Services, Clarksville
- Marine Services, Clarksville
- Market Research & Analysis , Clarksville - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Clarksville
- Martial Arts & Self Defense Schools, Clarksville
- Masonry Contractors, Clarksville - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Clarksville
- Massage Therapists & Professional, Clarksville
- Massage Therapy, Clarksville
- Medical & Health Service Organizations, Clarksville
- Medical Equipment Manufacturers, Clarksville
- Medical Supplies & Equipment, Clarksville
- Men's & Boys Clothing & Accessories Stores, Clarksville
- Men's Clothing Stores, Clarksville - Clothes & Accessories
- Merchandise Sales Events, Clarksville
- Merle Norman Cosmetics, Clarksville
- Metal Buildings, Clarksville - Kits, Homes, Steel Buildings, etc
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- Methodist Church, Clarksville
- Mexican Restaurants, Clarksville
- Mildew Removal & Control, Clarksville - Mold Removal
- Mini & Self Storage, Clarksville
- Mining, Clarksville
- Ministries Church, Clarksville
- Miscellaneous Business Credit Institutions & Services, Clarksville
- Miscellaneous Government, Clarksville
- Miscellaneous Industry, Clarksville
- Miscellaneous Personal Services, Clarksville
- Miscellaneous Photographers, Clarksville
- Miscellaneous Professional, Clarksville
- Mobile Home Parks & Communities , Clarksville
- Modular & Mobile Homes For Sale, Clarksville - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Clarksville
- Mortgages & Loans, 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 Companies, Clarksville
- Moving Supplies & Equipment Rental, Clarksville
- Moving Truck Rental , Clarksville
- Muffler Shop & Exhaust Systems, Clarksville
- Music, Clarksville
- Musical Instrument Rental, Clarksville - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Clarksville
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