- Machine Shop & Tool Repair Service, Bellport
- Machinery And Equipment Manufacturers, Bellport
- Machinery, Supplies & Equipment - Business Supplies Related, Bellport
- Machinery, Supplies & Equipment - Construction & Contractor Related, Bellport
- Magazine & Newspaper Stands, Bellport - Dealers & Distributors
- Magnetic Devices, Bellport
- Magnets & Magnetic Devices, Bellport
- Mailing, Delivery & Courier Service, Bellport
- Malls & Shopping Centers, Bellport
- Management Consultants & Services, Bellport
- Manicurists & Pedicurists, Bellport
- Manufacturing, Bellport
- Marble Contractors, Bellport - Installation, Cleaning & Removal Services
- Marinas & Marina Services, Bellport
- Marine Products And Services, Bellport
- Marine Repair & Service Stations, Bellport
- Marine Supplies & Equipment, Bellport - Boat Supplies
- Marine Supplies & Equipment Repair, Bellport - Boat Supplies & Equipment
- Masonry Contractors, Bellport - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Bellport
- Massage Therapists & Professional, Bellport
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- Massage Therapy, Bellport
- Meat Market, Wholesale & Products, Bellport
- Medical & Dental Management, Bellport
- Membership Sports & Recreation Clubs, Bellport
- Mental Health Specialists, Bellport - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Buildings, Bellport - Kits, Homes, Steel Buildings, etc
- Methodist Church, Bellport
- Miscellaneous Agriculture, Bellport
- Miscellaneous Personal Services, Bellport
- Miscellaneous Professional, Bellport
- Mortgage Bankers & Correspondents, Bellport
- Motion Picture Pre & Post Production Services, Bellport
- Motor Vehicle, Bellport
- Motor Vehicle Rental & Leasing, Bellport
- Moving Supplies & Equipment Rental, Bellport
- Moving Truck Rental , Bellport
- Museums, Bellport
- Music Entertainment, Bellport
- Musical Instrument Rental, Bellport - Band & Orchestra Instruments
- Musicians, Bands & Disc Jockeys, Bellport
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