- Machine Shop & Tool Repair Service, Billerica
- Machinery, Supplies & Equipment - Business Production Related, Billerica
- Machinery, Supplies & Equipment - Business Supplies Related, Billerica
- Machinery, Supplies & Equipment - Construction & Contractor Related, Billerica
- Mail Delivery Service, Billerica
- Mailing, Delivery & Courier Service, Billerica
- Major Appliances, Billerica - Household & Kitchen
- Management Consultants & Services, Billerica
- Manicurists & Pedicurists, Billerica
- Manufacturers Agents & Representatives, Billerica
- Manufacturers Representative, Billerica - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Billerica
- Manufacturing & Industrial Consultants, Billerica
- Manufacturing Products, Billerica
- Manufacturing Services, Billerica
- Marketing Consultants Professional Practices, Billerica
- Marriage & Family Counselors, Billerica
- Martial Arts & Self Defense Schools, Billerica
- Masonry Contractors, Billerica - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Billerica
- Massage Therapy, Billerica
- Material Handling & Heavy Machinery & Equipment, Billerica
- Mechanical Engineer, Billerica - Mechanical Engineering Service
- Medical Billing Services, Billerica
- Medical Diagnostic Clinics, Billerica - Clinical Labs & Centers
- Medical Research, Billerica
- Medical Research & Development, Billerica - Medical Information & Research
- Medical Supplies & Equipment, Billerica
- Membership Sports & Recreation Clubs, Billerica
- Men's Clothing Stores, Billerica - Clothes & Accessories
- Mental Health Specialists, Billerica - Psychologist, Psychiatrist, Psychotherapist, etc
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- Metal Finishers, Billerica
- Metal Forming Equipment, Billerica
- Metal Forming Machinery, Billerica
- Metal Plating & Polishing, Billerica
- Metal Repair Service & Blacksmith, Billerica - Iron Works
- Metal Working Machinery, Billerica
- Metaphysical Churches, Billerica
- Microwave Ovens, Billerica
- Middle Eastern Restaurants, Billerica
- Mining, Billerica
- Miscellaneous Household Item Repair, Billerica
- Miscellaneous Government, Billerica
- Miscellaneous Manufacturing, Billerica
- Miscellaneous Personal Services, Billerica
- Miscellaneous Professional, Billerica
- Modular & Mobile Homes For Sale, Billerica - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Billerica
- Mortgage Bankers & Correspondents, Billerica
- Motion Picture & Television Production Services, Billerica
- Motor Sports, Billerica
- Motor Vehicle, Billerica
- Motor Vehicle Rental & Leasing, Billerica
- Motorcycle Parts, Accessories & Dealers, Billerica
- Moving & Storage Supplies & Equipment, Billerica
- Moving Companies, Billerica
- Moving Supplies & Equipment Rental, Billerica
- Moving Truck Rental , Billerica
- Muffler Shop & Exhaust Systems, Billerica
- Multimedia Publishers, Billerica - Multimedia Services & Systems
- Music, Billerica
- Musical Instruments & Equipment Stores, Billerica
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