- Malls & Shopping Centers, Key Biscayne
- Management Consultants & Services, Key Biscayne
- Manifold Business Forms Manufacturers, Key Biscayne
- Manufacturing, Key Biscayne
- Martial Arts & Self Defense Schools, Key Biscayne
- Massage Therapy, Key Biscayne
- Medical & Dental Assistant Schools, Key Biscayne
- Medical & Dental Management, Key Biscayne
- Medical Diagnostic Imaging, Key Biscayne
- Medical Management & Business Administration Service, Key Biscayne
- Medical Supplies & Equipment, Key Biscayne
- Membership Sports & Recreation Clubs, Key Biscayne
- Mental Health Clinics, Key Biscayne - Treatment Centers
- Mental Health Specialists, Key Biscayne - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Marketing Consultants, Key Biscayne
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- Mexican Restaurants, Key Biscayne
- Miscellaneous Household Item Repair, Key Biscayne
- Miscellaneous Business Services, Key Biscayne
- Miscellaneous Government, Key Biscayne
- Miscellaneous Personal Services, Key Biscayne
- Miscellaneous Professional, Key Biscayne
- Mortgage Bankers & Correspondents, Key Biscayne
- Mortgages & Loans, Key Biscayne
- Motion Picture & Television Production Services, Key Biscayne
- Motion Picture Pre & Post Production Services, Key Biscayne
- Motor Vehicle, Key Biscayne
- Moving Companies, Key Biscayne
- Multimedia Publishers, Key Biscayne - Multimedia Services & Systems
- Music, Key Biscayne
- Musical Recording Services, Key Biscayne
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