- Machine Shop & Tool Repair Service, Clarksville
- Machinery And Equipment Manufacturers, Clarksville
- Machinery Custom Design Manufacturers, Clarksville
- Machinery Movers & Erectors, Clarksville
- Machinery, Supplies & Equipment - Business Production Related, Clarksville
- Machinery, Supplies & Equipment - Business Supplies Related, Clarksville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Clarksville
- Magazine & Newspaper Stands, Clarksville - Dealers & Distributors
- Mailbox Rental Services, 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
- Manufacturers Agents & Representatives, Clarksville
- Manufacturers Representative, Clarksville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Clarksville
- Manufacturing Products, Clarksville
- Map Publishers & Printers, Clarksville
- Mapping & Topographical Services, Clarksville
- Marble, Clarksville
- Marinas & Marina 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
- Mastectomy Apparel, Forms, Prostheses & Supplies, Clarksville
- Material Handling Equipment, Clarksville - Conveyor Belt, Pallet Jack, Forklift, etc
- Maternity Clothes & Clothing Stores, Clarksville - Maternity Dress, Gown, Swimwear, Underwear & More
- Mausoleums Developers, Clarksville
- Meat Market, Wholesale & Products, Clarksville
- Mechanical Contractors, Clarksville - Install, Service & Repair
- Medical & Health Service Organizations, Clarksville
- Medical Billing Services, Clarksville
- Medical Diagnostic Clinics, Clarksville - Clinical Labs & Centers
- Medical Groups & Clinics, Clarksville - Medical & Health Centers
- Medical Supplies & Equipment, Clarksville
- Medical Supplies Canes, Clarksville
- Meeting & Event Planning Services, Clarksville - Conference Consultants
- Membership Sports & Recreation Clubs, Clarksville
- Men's & Boys Clothing & Accessories Stores, Clarksville
- Men's Clothing Stores, Clarksville - Clothes & Accessories
- Mens & Boys Belts & Suspenders, Clarksville
- Mental Health Clinics, Clarksville - Treatment Centers
- Mental Health Specialists, Clarksville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Clarksville
- Merchandising & Marketing Consultants, Clarksville
- Merchandising & Pricing Equipment, Clarksville
- Merle Norman Cosmetics, Clarksville
- Metal Buildings, Clarksville - Kits, Homes, Steel Buildings, etc
- Metal Coating & Allied Services, Clarksville
- Metal Detecting Equipment, Clarksville
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- Metal Repair Service & Blacksmith, Clarksville - Iron Works
- Methodist Church, Clarksville
- Mexican Restaurants, Clarksville
- Middle Eastern Restaurants, Clarksville
- Mildew Removal & Control, Clarksville - Mold Removal
- Military Supplies, Clarksville
- Mini & Self Storage, Clarksville
- Mining, Clarksville
- Ministries Church, Clarksville
- Mirrors, Clarksville - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Clarksville
- Miscellaneous Household Item Repair, Clarksville
- Miscellaneous Agriculture, Clarksville
- Miscellaneous Business Services, Clarksville
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Clarksville
- Miscellaneous Government, Clarksville
- Miscellaneous Industry, Clarksville
- Miscellaneous Manufacturing, Clarksville
- Miscellaneous Personal Services, Clarksville
- Miscellaneous Photographers, Clarksville
- Miscellaneous Professional, Clarksville
- Mission Churches, Clarksville
- Mobile Home Parks & Communities , Clarksville
- Mobile Homes for Rent & Lease, Clarksville
- Mobile Travel Medicine, Clarksville
- Modular & Mobile Homes For Sale, Clarksville - Manufactured Homes Sale & Service
- Moisture & Vapor Control, Clarksville
- Monuments, Tombstones, Markers & Memorials, Clarksville
- Mortgage Bankers & Correspondents, Clarksville
- Mortgage Brokers, Clarksville
- Mortgage Companies, Clarksville
- Mortgage Feasibility Consultants, Clarksville
- Mortgages & Loans, Clarksville
- Motor Vehicle, Clarksville
- Motor Vehicle Rental & Leasing, Clarksville
- Motorcycle & Motor Scooters Dealers, Repair & Service, Clarksville
- Motorcycle Parts, Accessories & Dealers, Clarksville
- Motorcycle Repair & Service, Clarksville
- Movie Theaters, Clarksville
- Moving & Storage Supplies & Equipment, Clarksville
- Moving Companies, Clarksville
- Moving Services - Labor & Material, Clarksville
- Moving Supplies & Equipment Rental, Clarksville
- Moving Truck Rental , Clarksville
- Mowers & Tractors, Clarksville
- Muffler Shop & Exhaust Systems, Clarksville
- Mulch, Peat & Moss Products, Clarksville
- Museums, Clarksville
- Music, Clarksville
- Music Lessons, Clarksville
- Music Lessons - Instrumental, Clarksville
- Music Production Services, Clarksville
- Musical Instruments & Equipment Stores, Clarksville
- Musical Instruments Repair, Sales & Service, Clarksville
- Musical Recording Services, Clarksville
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