- Machinery, Supplies & Equipment - Business Production Related, Northampton
- Machinery, Supplies & Equipment - Business Supplies Related, Northampton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Northampton
- Magazine & Newspaper Stands, Northampton - Dealers & Distributors
- Mailbox Rental Services, Northampton
- Mailing, Delivery & Courier Service, Northampton
- Maintenance, Cleaning & Sanitation, Northampton
- Major Appliances, Northampton - Household & Kitchen
- Malls & Shopping Centers, Northampton
- Malpractice Attorneys & Lawyers, Northampton
- Malpractice Attorneys & Lawyers, Northampton
- Malpractice Lawyers & Attorneys, Northampton
- Management Consultants & Services, Northampton
- Manicurists & Pedicurists, Northampton
- Manufacturing, Northampton
- Marinas & Marina Services, Northampton
- Market Research & Analysis , Northampton - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Northampton
- Martial Arts & Self Defense Schools, Northampton
- Masonry Materials & Supplies, Northampton
- Massage Therapists & Professional, Northampton
- Massage Therapy, Northampton
- Material Handling & Heavy Machinery & Equipment, Northampton
- Medical & Health Service Organizations, Northampton
- Medical Supplies & Equipment, Northampton
- Men's Clothing Stores, Northampton - Clothes & Accessories
- Mental Health Clinics, Northampton - Treatment Centers
- Mental Health Specialists, Northampton - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, Northampton - Iron Works
- Metaphysical Churches, Northampton
- Methodist Church, Northampton
- Mexican Restaurants, Northampton
- Middle Eastern Restaurants, Northampton
- Mildew Removal & Control, Northampton - Mold Removal
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- Millwork Contractors, Northampton
- Ministries Church, Northampton
- Mirrors, Northampton - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Government, Northampton
- Miscellaneous Manufacturing, Northampton
- Miscellaneous Personal Services, Northampton
- Miscellaneous Professional, Northampton
- Mortgage Bankers & Correspondents, Northampton
- Mosquito Control, Northampton
- Motion Picture & Television Production Services, Northampton
- Motion Picture Dists & Producers, Northampton
- Motion Picture Pre & Post Production Services, Northampton
- Motor Vehicle, Northampton
- Motor Vehicle Rental & Leasing, Northampton
- Motorcycle & Motor Scooters Dealers, Repair & Service, Northampton
- Motorcycle Parts, Accessories & Dealers, Northampton
- Motorcycle Repair & Service, Northampton
- Movie Theaters, Northampton
- Moving & Storage Supplies & Equipment, Northampton
- Moving Truck Rental , Northampton
- Muffler Shop & Exhaust Systems, Northampton
- Multimedia Publishers, Northampton - Multimedia Services & Systems
- Museums, Northampton
- Music, Northampton
- Music Entertainment, Northampton
- Music Lessons, Northampton
- Music Lessons - Instrumental, Northampton
- Music Teachers, Northampton
- Musical Instrument Rental, Northampton - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Northampton
- Musical Instruments Repair, Sales & Service, Northampton
- Musical Recording Services, Northampton
- Musicians, Bands & Disc Jockeys, Northampton
- Myofunctional Therapy, Northampton
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