- Machine Shop & Tool Repair Service, Clinton
- Machinery Rebuilt & Used, Clinton
- Machinery, Supplies & Equipment - Business Production Related, Clinton
- Machinery, Supplies & Equipment - Business Supplies Related, Clinton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Clinton
- Mail Delivery Service, Clinton
- Management Consultants & Services, Clinton
- Manicurists & Pedicurists, Clinton
- Manufacturers Agents & Representatives, Clinton
- Manufacturers Representative, Clinton - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Clinton
- Manufacturing Products, Clinton
- Marriage & Family Counselors, Clinton
- Masonry Contractors, Clinton - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Clinton
- Massage Therapists & Professional, Clinton
- Massage Therapy, Clinton
- Medical Research, Clinton
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- Medical Research & Development, Clinton - Medical Information & Research
- Medical Supplies & Equipment, Clinton
- Mental Health Specialists, Clinton - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Clinton
- Miscellaneous Government, Clinton
- Miscellaneous Manufacturing, Clinton
- Miscellaneous Personal Services, Clinton
- Miscellaneous Professional, Clinton
- Monuments, Tombstones, Markers & Memorials, Clinton
- Mortgage Bankers & Correspondents, Clinton
- Motor Vehicle, Clinton
- Motor Vehicle Rental & Leasing, Clinton
- Movie Theaters, Clinton
- Moving & Storage Consultants, Clinton
- Moving Companies, Clinton
- Moving Truck Rental , Clinton
- Museums, Clinton
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