- Machine Shop & Tool Repair Service, Newburyport
- Machine Shops Experimental, Newburyport
- Machinery, Supplies & Equipment - Business Production Related, Newburyport
- Machinery, Supplies & Equipment - Business Supplies Related, Newburyport
- Machinery, Supplies & Equipment - Construction & Contractor Related, Newburyport
- Magazine & Newspaper Stands, Newburyport - Dealers & Distributors
- Mail Delivery Service, Newburyport
- Mailing, Delivery & Courier Service, Newburyport
- Maintenance, Cleaning & Sanitation, Newburyport
- Malls & Shopping Centers, Newburyport
- Management Consultants & Services, Newburyport
- Manicurists & Pedicurists, Newburyport
- Manufacturers Agents & Representatives, Newburyport
- Manufacturers Representative, Newburyport - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Newburyport
- Manufacturing & Industrial Consultants, Newburyport
- Manufacturing Equipment & Supplies, Newburyport
- Manufacturing Products, Newburyport
- Manufacturing Services, Newburyport
- Marinas & Marina Services, Newburyport
- Marine Supplies & Equipment, Newburyport - Boat Supplies
- Marriage & Family Counselors, Newburyport
- Marriage & Family Counselors Information & Referrals, Newburyport
- Martial Arts & Self Defense Schools, Newburyport
- Massage Therapists & Professional, Newburyport
- Massage Therapy, Newburyport
- Massage Therapy Relaxation, Newburyport
- Material Handling & Heavy Machinery & Equipment, Newburyport
- Meat Market, Wholesale & Products, Newburyport
- Mechanical Contractors, Newburyport - Install, Service & Repair
- Mechanical Engineer, Newburyport - Mechanical Engineering Service
- Medical & Health Service Organizations, Newburyport
- Medical Billing Services, Newburyport
- Medical Supplies & Equipment, Newburyport
- Membership Sports & Recreation Clubs, Newburyport
- Men's & Boys Clothing & Accessories Stores, Newburyport
- Mental Health Specialists, Newburyport - Psychologist, Psychiatrist, Psychotherapist, etc
- Messianic Synagogues, Newburyport
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- Metal Foil & Leaf Manufacturers, Newburyport
- Metal Plating & Polishing, Newburyport
- Metal Products, Newburyport
- Metal Stampings Manufacturers, Newburyport
- Metaphysical Churches, Newburyport
- Methodist Church, Newburyport
- Mexican Restaurants, Newburyport
- Microwave Communications, Newburyport
- Middle Eastern Restaurants, Newburyport
- Mildew Removal & Control, Newburyport - Mold Removal
- Mill Supplies & Equipment, Newburyport - Milling Machines
- Mind-Body Massage, Newburyport
- Mirrors, Newburyport - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Newburyport
- Miscellaneous Household Item Repair, Newburyport
- Miscellaneous Government, Newburyport
- Miscellaneous Manufacturing, Newburyport
- Miscellaneous Metal Work Manufacturers, Newburyport
- Miscellaneous Personal Services, Newburyport
- Miscellaneous Photographers, Newburyport
- Miscellaneous Professional, Newburyport
- Moldings Materials, Newburyport
- Mortgage Bankers & Correspondents, Newburyport
- Motion Picture Pre & Post Production Services, Newburyport
- Motor Vehicle, Newburyport
- Motor Vehicle Rental & Leasing, Newburyport
- Movie Theaters, Newburyport
- Moving & Storage Supplies & Equipment, Newburyport
- Moving Companies, Newburyport
- Muffler Shop & Exhaust Systems, Newburyport
- Mulch, Peat & Moss Products, Newburyport
- Museums, Newburyport
- Music, Newburyport
- Music Entertainment, Newburyport
- Music Lessons, Newburyport
- Music Lessons - Instrumental, Newburyport
- Musicians, Bands & Disc Jockeys, Newburyport
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