- Machine Shop & Tool Repair Service, Melville
- Machine Tools Manufacturers Metal Cutting Types, Melville
- Machinery And Equipment Manufacturers, Melville
- Machinery Repair & Rebuild, Melville
- Machinery, Supplies & Equipment - Business Production Related, Melville
- Machinery, Supplies & Equipment - Business Supplies Related, Melville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Melville
- Magazine & Newspaper Stands, Melville - Dealers & Distributors
- Mail Delivery Service, Melville
- Mailing, Delivery & Courier Service, Melville
- Major Appliances, Melville - Household & Kitchen
- Management Consultants & Services, Melville
- Manicurists & Pedicurists, Melville
- Manufacturers Agents & Representatives, Melville
- Manufacturers Representative, Melville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Melville
- Manufacturing & Industrial Consultants, Melville
- Manufacturing Equipment & Supplies, Melville
- Manufacturing Products, Melville
- Marble & Terrazzo Flooring - Cleaning & Service, Melville
- Marine Contractors & Designers, Melville
- Marine Electronic Equipment, Melville
- Marine Products And Services, Melville
- Marine Repair & Service Stations, Melville
- Marine Supplies & Equipment Repair, Melville - Boat Supplies & Equipment
- Market Research & Analysis , Melville - Market Analysis, Business & Economic Research
- Marketing Consultants Professional Practices, Melville
- Marriage & Family Counselors, Melville
- Masonry Contractors, Melville - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Melville
- Material Handling & Heavy Machinery & Equipment, Melville
- Mechanical Engineer, Melville - Mechanical Engineering Service
- Medical & Health Service Organizations, Melville
- Medical Billing Services, Melville
- Medical Claims Processing & Assistance, Melville
- Medical Diagnostic Clinics, Melville - Clinical Labs & Centers
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- Medical Research, Melville
- Medical Research & Development, Melville - Medical Information & Research
- Medical Supplies & Equipment, Melville
- Membership Sports & Recreation Clubs, Melville
- Mental Health Specialists, Melville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Melville
- Merchandising & Pricing Equipment, Melville
- Metal Distributors, Melville
- Metal Working Machinery, Melville
- Mexican Restaurants, Melville
- Millwork Contractors, Melville
- Mini & Self Storage, Melville
- Miscellaneous Household Item Repair, Melville
- Miscellaneous Business Services, Melville
- Miscellaneous Government, Melville
- Miscellaneous Manufacturing, Melville
- Miscellaneous Personal Services, Melville
- Miscellaneous Photographers, Melville
- Miscellaneous Professional, Melville
- Mortgage Bankers & Correspondents, Melville
- Mortgage Companies, Melville
- Mortgage Service Bureaus, Melville
- Mortgages & Loans, Melville
- Motor Homes Renting & Leasing, Melville
- Motor Vehicle, Melville
- Motor Vehicle Rental & Leasing, Melville
- Moving & Storage Consultants, Melville
- Moving & Storage Supplies & Equipment, Melville
- Moving Companies, Melville
- Multimedia Publishers, Melville - Multimedia Services & Systems
- Music, Melville
- Music Entertainment, Melville
- Music Schools, Melville
- Musical Instrument Rental, Melville - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Melville
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