- Machinery Movers & Erectors, Northborough
- Machinery, Supplies & Equipment - Business Production Related, Northborough
- Machinery, Supplies & Equipment - Business Supplies Related, Northborough
- Machinery, Supplies & Equipment - Construction & Contractor Related, Northborough
- Mail Delivery Service, Northborough
- Mailing, Delivery & Courier Service, Northborough
- Maintenance, Cleaning & Sanitation, Northborough
- Major Appliances, Northborough - Household & Kitchen
- Management Consultants & Services, Northborough
- Mandarin Restaurants, Northborough
- Manicurists & Pedicurists, Northborough
- Manufacturers Agents & Representatives, Northborough
- Manufacturers Representative, Northborough - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Northborough
- Manufacturing & Industrial Consultants, Northborough
- Manufacturing Equipment & Supplies, Northborough
- Manuscript Service, Northborough
- Marriage & Family Counselors, Northborough
- Martial Arts & Self Defense Schools, Northborough
- Masonry Contractors, Northborough - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Northborough
- Massage Therapy, Northborough
- Material Handling Equipment, Northborough - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, Northborough
- Medical Research, Northborough
- Medical Research & Development, Northborough - Medical Information & Research
- Membership Sports & Recreation Clubs, Northborough
- Men's & Boys Clothing & Accessories Stores, Northborough
- Men's Clothing Stores, Northborough - Clothes & Accessories
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- Mens & Boys Jeans & Western Wear Stores, Northborough
- Mental Health Clinics, Northborough - Treatment Centers
- Mental Health Specialists, Northborough - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, Northborough - Iron Works
- Metaphysical Churches, Northborough
- Mexican Restaurants, Northborough
- Millwork Contractors, Northborough
- Mini & Self Storage, Northborough
- Miscellaneous Household Item Repair, Northborough
- Miscellaneous Business Services, Northborough
- Miscellaneous Manufacturing, Northborough
- Miscellaneous Personal Services, Northborough
- Miscellaneous Photographers, Northborough
- Miscellaneous Professional, Northborough
- Mortgage Bankers & Correspondents, Northborough
- Motion Pictures Video Tape Duplication & Transfer Services, Northborough
- Motor Vehicle, Northborough
- Motor Vehicle Rental & Leasing, Northborough
- Motorcycle & Motor Scooters Dealers, Repair & Service, Northborough
- Motorcycle Parts, Accessories & Dealers, Northborough
- Motorcycle Repair & Service, Northborough
- Moving Companies, Northborough
- Moving Truck Rental , Northborough
- Mulch, Peat & Moss Products, Northborough
- Music, Northborough
- Music Lessons, Northborough
- Music Lessons - Instrumental, Northborough
- Musical Instrument Rental, Northborough - Band & Orchestra Instruments
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