- Machinery, Supplies & Equipment - Business Supplies Related, Clarksville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Clarksville
- Mailbox Rental Services, Clarksville
- Mailing, Delivery & Courier Service, Clarksville
- Management Consultants & Services, Clarksville
- Manicurists & Pedicurists, Clarksville
- Manufacturing, Clarksville
- Market Research & Analysis , Clarksville - Market Analysis, Business & Economic Research
- Martial Arts & Self Defense Schools, Clarksville
- Massage Therapists & Professional, Clarksville
- Massage Therapy, Clarksville
- Medical Diagnostic Clinics, Clarksville - Clinical Labs & Centers
- Men's Clothing Stores, Clarksville - Clothes & Accessories
- Mental Health Specialists, Clarksville - Psychologist, Psychiatrist, Psychotherapist, etc
- Messianic Church, Clarksville
- Messianic Synagogues, Clarksville
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- Methodist Church, Clarksville
- Mexican Restaurants, Clarksville
- Miscellaneous Government, Clarksville
- Miscellaneous Manufacturing, Clarksville
- Miscellaneous Personal Services, Clarksville
- Miscellaneous Professional, Clarksville
- Mortgage Bankers & Correspondents, Clarksville
- Mortgage Companies, Clarksville
- Mortgage Contracts & Services, Clarksville
- Mortgages & Loans, Clarksville
- Mortgages Commercial & Industrial, Clarksville
- Motor Vehicle, Clarksville
- Motor Vehicle Rental & Leasing, Clarksville
- Moving & Storage Supplies & Equipment, Clarksville
- Moving Companies, Clarksville
- Muffler Shop & Exhaust Systems, Clarksville
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