- Machine Shop, Amityville
- Machine Shop & Tool Repair Service, Amityville
- Machinery, Supplies & Equipment - Business Production Related, Amityville
- Machinery, Supplies & Equipment - Business Supplies Related, Amityville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Amityville
- Magazine & Newspaper Stands, Amityville - Dealers & Distributors
- Mailboxes Retail, Amityville
- Major Appliances, Amityville - Household & Kitchen
- Malls & Shopping Centers, Amityville
- Managed Care Plans, Amityville
- Management Consultants & Services, Amityville
- Manicurists & Pedicurists, Amityville
- Manufacturers Agents & Representatives, Amityville
- Manufacturers Representative, Amityville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Amityville
- Manufacturing Products, Amityville
- Marinas & Marina Services, Amityville
- Marine Contractors & Designers, Amityville
- Marine Products And Services, Amityville
- Marine Repair & Service Stations, Amityville
- Marine Services, Amityville
- Marine Supplies & Equipment Repair, Amityville - Boat Supplies & Equipment
- Marine Surveyors & Adjustors, Amityville
- Marriage & Family Counselors, Amityville
- Martial Arts & Self Defense Schools, Amityville
- Masking & Shipping Tapes, Amityville
- Massage Therapists & Professional, Amityville
- Massage Therapy, Amityville
- Medical Examiner, Amityville - Doctors, Physicians & Surgeons
- Medical Supplies & Equipment, Amityville
- Meeting & Event Planning Services, Amityville - Conference Consultants
- Membership Sports & Recreation Clubs, Amityville
- Men's Clothing Stores, Amityville - Clothes & Accessories
- Mental Health Clinics, Amityville - Treatment Centers
- Mental Health Specialists, Amityville - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, Amityville - Iron Works
- Meteorologists, Amityville
- Methodist Church, Amityville
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- Mexican Restaurants, Amityville
- Millwork Contractors, Amityville
- Mini & Self Storage, Amityville
- Ministries Church, Amityville
- Miscellaneous Household Item Repair, Amityville
- Miscellaneous Business Services, Amityville
- Miscellaneous Government, Amityville
- Miscellaneous Manufacturing, Amityville
- Miscellaneous Personal Services, Amityville
- Miscellaneous Photographers, Amityville
- Miscellaneous Professional, Amityville
- Mobile Home Parks & Communities , Amityville
- Modeling & Talent Agencies, Amityville
- Modular & Mobile Homes For Sale, Amityville - Manufactured Homes Sale & Service
- Moldings Materials, Amityville
- Mortgage Bankers & Correspondents, Amityville
- Mosques, Amityville
- Motion Picture & Television Production Services, Amityville
- Motion Picture Pre & Post Production Services, Amityville
- Motion Pictures Video Tape Duplication & Transfer Services, Amityville
- Motor Sports, Amityville
- Motor Vehicle, Amityville
- Motor Vehicle Rental & Leasing, Amityville
- Motorcycle & Motor Scooters Dealers, Repair & Service, Amityville
- Motorcycle Repair & Service, Amityville
- Moving Companies, Amityville
- Moving Supplies & Equipment Rental, Amityville
- Moving Truck Rental , Amityville
- Muffler Shop & Exhaust Systems, Amityville
- Music, Amityville
- Music Entertainment, Amityville
- Music Lessons, Amityville
- Music Lessons - Instrumental, Amityville
- Music Schools, Amityville
- Musical Instrument Rental, Amityville - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Amityville
- Musical Instruments Repair, Sales & Service, Amityville
- Musicians, Bands & Disc Jockeys, Amityville
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