- Machinery, Supplies & Equipment - Business Production Related, Southport
- Machinery, Supplies & Equipment - Construction & Contractor Related, Southport
- Major Appliances, Southport - Household & Kitchen
- Management Consultants & Services, Southport
- Manicurists & Pedicurists, Southport
- Manufacturing, Southport
- Manufacturing Products, Southport
- Marinas & Marina Services, Southport
- Marine Cargo Handling, Southport
- Marine Contractors & Designers, Southport
- Marine Supplies & Equipment, Southport - Boat Supplies
- Masonry Materials & Supplies, Southport
- Mattress & Bedspring Manufacturers, Southport
- Medical Supplies & Equipment, Southport
- Membership Sports & Recreation Clubs, Southport
- Mental Health Specialists, Southport - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Southport
- Metal Products, Southport
- Methodist Church, Southport
- Mexican Restaurants, Southport
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- Mini & Self Storage, Southport
- Miscellaneous Business Services, Southport
- Miscellaneous Government, Southport
- Miscellaneous Personal Services, Southport
- Miscellaneous Photographers, Southport
- Miscellaneous Professional, Southport
- Mobile Home Parks & Communities , Southport
- Moisture & Vapor Control, Southport
- Mortgage Bankers & Correspondents, Southport
- Mortgages & Loans, Southport
- Motion Picture & Television Production Services, Southport
- Motion Picture Dists & Producers, Southport
- Motor Vehicle, Southport
- Motor Vehicle Rental & Leasing, Southport
- Motorcycle & Motor Scooters Dealers, Repair & Service, Southport
- Motorcycle Repair & Service, Southport
- Movie Theaters, Southport
- Moving Companies, Southport
- Moving Truck Rental , Southport
- Muffler Shop & Exhaust Systems, Southport
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