- Machine Shop & Tool Repair Service, Hauppauge
- Machine Tools , Hauppauge
- Machine Tools Manufacturers Metal Cutting Types, Hauppauge
- Machinery And Equipment Manufacturers, Hauppauge
- Machinery Custom Design Manufacturers, Hauppauge
- Machinery, Supplies & Equipment - Business Production Related, Hauppauge
- Machinery, Supplies & Equipment - Business Supplies Related, Hauppauge
- Machinery, Supplies & Equipment - Construction & Contractor Related, Hauppauge
- Magnetic Devices, Hauppauge
- Magnets & Magnetic Devices, Hauppauge
- Mail Delivery Service, Hauppauge
- Mailbox Rental Services, Hauppauge
- Mailing, Delivery & Courier Service, Hauppauge
- Major Appliances, Hauppauge - Household & Kitchen
- Management Consultants & Services, Hauppauge
- Manicurists & Pedicurists, Hauppauge
- Manifold Business Forms Manufacturers, Hauppauge
- Manufacturers Agents & Representatives, Hauppauge
- Manufacturers Representative, Hauppauge - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Hauppauge
- Manufacturing & Industrial Consultants, Hauppauge
- Manufacturing Products, Hauppauge
- Marble, Hauppauge
- Marble Tile, Hauppauge
- Marine Products And Services, Hauppauge
- Marine Repair & Service Stations, Hauppauge
- Marine Supplies & Equipment, Hauppauge - Boat Supplies
- Marine Supplies & Equipment Repair, Hauppauge - Boat Supplies & Equipment
- Marine Surveyors & Adjustors, Hauppauge
- Marketing Consultants Professional Practices, Hauppauge
- Marketing Schools, Hauppauge
- Marriage & Family Counselors, Hauppauge
- Masonry Contractors, Hauppauge - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Hauppauge
- Massage Therapists & Professional, Hauppauge
- Massage Therapy, Hauppauge
- Material Handling Equipment, Hauppauge - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, Hauppauge
- Medical & Dental Management, Hauppauge
- Medical & Health Service Organizations, Hauppauge
- Medical Billing Services, Hauppauge
- Medical Diagnostic Clinics, Hauppauge - Clinical Labs & Centers
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Hauppauge
- Medical Supplies & Equipment, Hauppauge
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- Membership Sports & Recreation Clubs, Hauppauge
- Men's & Boys Clothing & Accessories Stores, Hauppauge
- Mens & Boys Hats, Gloves & Neckwear, Hauppauge
- Mental & Developmental Information & Referral Services, Hauppauge
- Mental Health Specialists, Hauppauge - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Hauppauge
- Messenger Service, Hauppauge - Message Receiving & Forwarding Service
- Metal Lockers, Hauppauge
- Metal Products, Hauppauge
- Metal Shapes Extruded, Hauppauge
- Metal Specialties, Hauppauge
- Metal Stampings Manufacturers, Hauppauge
- Methodist Church, Hauppauge
- Mexican Restaurants, Hauppauge
- Microwave Communications, Hauppauge
- Military Supplies, Hauppauge
- Mini & Self Storage, Hauppauge
- Miscellaneous Household Item Repair, Hauppauge
- Miscellaneous Business Services, Hauppauge
- Miscellaneous Government, Hauppauge
- Miscellaneous Manufacturing, Hauppauge
- Miscellaneous Metal Work Manufacturers, Hauppauge
- Miscellaneous Personal Services, Hauppauge
- Miscellaneous Professional, Hauppauge
- Modular & Mobile Homes For Sale, Hauppauge - Manufactured Homes Sale & Service
- Moldings Materials, Hauppauge
- Mortgage Bankers & Correspondents, Hauppauge
- Mortgage Companies, Hauppauge
- Mortgages & Loans, Hauppauge
- Motion Picture & Television Production Services, Hauppauge
- Motion Picture Pre & Post Production Services, Hauppauge
- Motion Picture Projection Service, Hauppauge
- Motor Vehicle, Hauppauge
- Motor Vehicle Rental & Leasing, Hauppauge
- Moving & Storage Supplies & Equipment, Hauppauge
- Moving Companies, Hauppauge
- Moving Services - Labor & Material, Hauppauge
- Moving Supplies & Equipment Rental, Hauppauge
- Moving Truck Rental , Hauppauge
- Music, Hauppauge
- Music Lessons, Hauppauge
- Music Lessons - Instrumental, Hauppauge
- Musical Instruments & Equipment Stores, Hauppauge
- Musical Recording Services, Hauppauge
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