- Machinery, Supplies & Equipment - Business Supplies Related, Southport
- Management Consultants & Services, Southport
- Manicurists & Pedicurists, Southport
- Manufacturing, Southport
- Manufacturing Products, Southport
- Marine Surveyors & Adjustors, Southport
- Market Research & Analysis , Southport - Market Analysis, Business & Economic Research
- Meat Market, Wholesale & Products, Southport
- Medical & Dental Management, Southport
- Medical Diagnostic Clinics, Southport - Clinical Labs & Centers
- Medical Supplies & Equipment, Southport
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- Meeting & Event Planning Services, Southport - Conference Consultants
- Membership Sports & Recreation Clubs, Southport
- Mental Health Specialists, Southport - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Marketing Consultants, Southport
- Metal Plating & Polishing, Southport
- Middle Eastern Restaurants, Southport
- Miscellaneous Personal Services, Southport
- Miscellaneous Professional, Southport
- Mortgage Bankers & Correspondents, Southport
- Motion Picture & Television Production Services, Southport
- Motor Vehicle, Southport
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