- Machine Shop & Tool Repair Service, Port Washington
- Machinery And Equipment Manufacturers, Port Washington
- Machinery, Supplies & Equipment - Business Production Related, Port Washington
- Machinery, Supplies & Equipment - Business Supplies Related, Port Washington
- Machinery, Supplies & Equipment - Construction & Contractor Related, Port Washington
- Mailbox Rental Services, Port Washington
- Mailing, Delivery & Courier Service, Port Washington
- Major Appliances, Port Washington - Household & Kitchen
- Malls & Shopping Centers, Port Washington
- Malpractice Attorneys & Lawyers, Port Washington
- Management Consultants & Services, Port Washington
- Management Training & Development, Port Washington
- Manicurists & Pedicurists, Port Washington
- Manufacturers Agents & Representatives, Port Washington
- Manufacturers Representative, Port Washington - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Port Washington
- Manufacturing & Industrial Consultants, Port Washington
- Manufacturing Products, Port Washington
- Marble Contractors, Port Washington - Installation, Cleaning & Removal Services
- Marinas & Marina Services, Port Washington
- Marine Contractors & Designers, Port Washington
- Marine Electronic Equipment, Port Washington
- Marine Products And Services, Port Washington
- Marine Services, Port Washington
- Marine Supplies & Equipment, Port Washington - Boat Supplies
- Market Research & Analysis , Port Washington - Market Analysis, Business & Economic Research
- Marketing Consultants Professional Practices, Port Washington
- Marriage & Family Counselors, Port Washington
- Martial Arts & Self Defense Schools, Port Washington
- Masonry Contractors, Port Washington - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Port Washington
- Massage Therapy, Port Washington
- Meat Market, Wholesale & Products, Port Washington
- Mechanical Contractors, Port Washington - Install, Service & Repair
- Medical & Health Service Organizations, Port Washington
- Medical Diagnostic Clinics, Port Washington - Clinical Labs & Centers
- Medical Equipment Manufacturers, Port Washington
- Medical Products & Equipment, Port Washington
- Medical Research Facilities, Port Washington - Research & Development Centers
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- Medical Supplies & Equipment, Port Washington
- Membership Sports & Recreation Clubs, Port Washington
- Mental Health Specialists, Port Washington - Psychologist, Psychiatrist, Psychotherapist, etc
- Messenger Service, Port Washington - Message Receiving & Forwarding Service
- Metal Repair Service & Blacksmith, Port Washington - Iron Works
- Metal Working Machinery, Port Washington
- Methodist Church, Port Washington
- Mexican Restaurants, Port Washington
- Mica & Mica Products, Port Washington
- Minerals, Port Washington
- Mini & Self Storage, Port Washington
- Mirrors, Port Washington - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Port Washington
- Miscellaneous Household Item Repair, Port Washington
- Miscellaneous Agriculture, Port Washington
- Miscellaneous Business Services, Port Washington
- Miscellaneous Government, Port Washington
- Miscellaneous Manufacturing, Port Washington
- Miscellaneous Personal Services, Port Washington
- Miscellaneous Professional, Port Washington
- Mission Churches, Port Washington
- Mortgage Bankers & Correspondents, Port Washington
- Mortgages & Loans, Port Washington
- Motion Picture Pre & Post Production Services, Port Washington
- Motor Vehicle, Port Washington
- Motor Vehicle Rental & Leasing, Port Washington
- Motorcycle Parts, Accessories & Dealers, Port Washington
- Movie Theaters, Port Washington
- Moving & Storage Supplies & Equipment, Port Washington
- Moving Companies, Port Washington
- Muffler Shop & Exhaust Systems, Port Washington
- Museums, Port Washington
- Music, Port Washington
- Music Lessons, Port Washington
- Music Lessons - Instrumental, Port Washington
- Music Teachers, Port Washington
- Musical Instrument Rental, Port Washington - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Port Washington
- Musical Recording Services, Port Washington
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