- Machine Shop & Tool Repair Service, Copiague
- Machinery, Supplies & Equipment - Business Production Related, Copiague
- Machinery, Supplies & Equipment - Business Supplies Related, Copiague
- Machinery, Supplies & Equipment - Construction & Contractor Related, Copiague
- Management Consultants & Services, Copiague
- Manicurists & Pedicurists, Copiague
- Manifold Business Forms Manufacturers, Copiague
- Manufacturers Agents & Representatives, Copiague
- Manufacturers Representative, Copiague - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Copiague
- Manufacturing Products, Copiague
- Marinas & Marina Services, Copiague
- Marine Electronic Equipment, Copiague
- Marine Products And Services, Copiague
- Marine Services, Copiague
- Martial Arts & Self Defense Schools, Copiague
- Masonry Contractors, Copiague - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Copiague
- Massage Therapy, Copiague
- Material Handling & Heavy Machinery & Equipment, Copiague
- Meat Market, Wholesale & Products, Copiague
- Mechanical Contractors, Copiague - Install, Service & Repair
- Medical & Health Service Organizations, Copiague
- Medical Diagnostic Clinics, Copiague - Clinical Labs & Centers
- Medical Supplies & Equipment, Copiague
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- Membership Sports & Recreation Clubs, Copiague
- Mental Health Clinics, Copiague - Treatment Centers
- Metal Finishers, Copiague
- Metal Plating & Polishing, Copiague
- Metal Specialties, Copiague
- Metal Stampings Manufacturers, Copiague
- Metal Tanks, Copiague
- Methodist Church, Copiague
- Miscellaneous Agriculture, Copiague
- Miscellaneous Business Services, Copiague
- Miscellaneous Manufacturing, Copiague
- Miscellaneous Metal Work Manufacturers, Copiague
- Miscellaneous Personal Services, Copiague
- Miscellaneous Professional, Copiague
- Mortgage Bankers & Correspondents, Copiague
- Motor Vehicle, Copiague
- Motor Vehicle Rental & Leasing, Copiague
- Moving Truck Rental , Copiague
- Muffler Shop & Exhaust Systems, Copiague
- Music, Copiague
- Music Lessons, Copiague
- Music Lessons - Instrumental, Copiague
- Musical Instruments & Equipment Stores, Copiague
- Musical Instruments - Guitars, Copiague
- Musical Recording Services, Copiague
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