- Machine Shop & Tool Repair Service, Northampton
- Machinery, Supplies & Equipment - Business Production Related, Northampton
- Machinery, Supplies & Equipment - Business Supplies Related, Northampton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Northampton
- Maintenance, Cleaning & Sanitation, Northampton
- Management Consultants & Services, Northampton
- Manicurists & Pedicurists, Northampton
- Manufacturing, Northampton
- Manufacturing Products, Northampton
- Marinas & Aquariums, Northampton
- Martial Arts & Self Defense Schools, Northampton
- Masonry Contractors, Northampton - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Northampton
- Massage Therapy, Northampton
- Meat Market, Wholesale & Products, Northampton
- Mechanical Contractors, Northampton - Install, Service & Repair
- Medical Supplies & Equipment, Northampton
- Membership Sports & Recreation Clubs, Northampton
- Metal Pigment & Paint Products, Northampton
- Metal Roll Forming Manufacturers, Northampton
- Methodist Church, Northampton
- Mexican Restaurants, Northampton
- Mildew Removal & Control, Northampton - Mold Removal
- Mini & Self Storage, Northampton
- Mining Equipment & Supplies, Northampton
- Mining Equipment & Supplies Service & Repair, Northampton
- Mirrors, Northampton - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Northampton
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- Miscellaneous Business Services, Northampton
- Miscellaneous Government, Northampton
- Miscellaneous Metal Work Manufacturers, Northampton
- Miscellaneous Personal Services, Northampton
- Miscellaneous Photographers, Northampton
- Miscellaneous Professional, Northampton
- Mission Churches, Northampton
- Mobile Home Parks & Communities , Northampton
- Modular & Mobile Homes For Sale, Northampton - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Northampton
- Mortgages & Loans, Northampton
- Motion Picture Pre & Post Production Services, Northampton
- Motor Vehicle, Northampton
- Motor Vehicle Rental & Leasing, Northampton
- Motorcycle & Motor Scooters Dealers, Repair & Service, Northampton
- Motorcycle Repair & Service, Northampton
- Movie Theaters, Northampton
- Moving Companies, Northampton
- Moving Services - Labor & Material, Northampton
- Moving Supplies & Equipment Rental, Northampton
- Moving Truck Rental , Northampton
- Mulch, Peat & Moss Products, Northampton
- Music, Northampton
- Music Background Leased, Northampton
- Music Lessons, Northampton
- Music Lessons - Instrumental, Northampton
- Music Production Services, Northampton
- Musical Recording Services, Northampton
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