- Machine Shop & Tool Repair Service, Somerville
- Machine Tools Manufacturers Metal Cutting Types, Somerville
- Machinery And Equipment Manufacturers, Somerville
- Machinery Repair & Rebuild, Somerville
- Machinery, Supplies & Equipment - Business Production Related, Somerville
- Machinery, Supplies & Equipment - Business Supplies Related, Somerville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Somerville
- Magazine & Newspaper Stands, Somerville - Dealers & Distributors
- Mailing, Delivery & Courier Service, Somerville
- Major Appliances, Somerville - Household & Kitchen
- Management Consultants & Services, Somerville
- Manicurists & Pedicurists, Somerville
- Manufacturers Agents & Representatives, Somerville
- Manufacturers Representative, Somerville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Somerville
- Manufacturing Products, Somerville
- Marriage & Family Counselors, Somerville
- Martial Arts & Self Defense Schools, Somerville
- Masonry Contractors, Somerville - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Somerville
- Massage Therapists & Professional, Somerville
- Massage Therapy, Somerville
- Material Handling & Heavy Machinery & Equipment, Somerville
- Mechanical Contractors, Somerville - Install, Service & Repair
- Medical & Dental Management, Somerville
- Medical & Health Service Organizations, Somerville
- Medical Diagnostic Clinics, Somerville - Clinical Labs & Centers
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Somerville
- Medical Groups & Clinics, Somerville - Medical & Health Centers
- Medical Research, Somerville
- Medical Research & Development, Somerville - Medical Information & Research
- Medical Supplies & Equipment, Somerville
- Meeting & Event Planning Services, Somerville - Conference Consultants
- Membership Sports & Recreation Clubs, Somerville
- Men's Clothing Stores, Somerville - Clothes & Accessories
- Men's Shoe Stores, Somerville
- Mental Health Specialists, Somerville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merle Norman Cosmetics, Somerville
- Metaphysical Churches, Somerville
- Methodist Church, Somerville
- Mexican Restaurants, Somerville
- Middle Eastern Restaurants, Somerville
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- Mill Supply & Equipment, Somerville
- Milling Cutters, Somerville
- Mini & Self Storage, Somerville
- Mining, Somerville
- Miscellaneous Household Item Repair, Somerville
- Miscellaneous Business Services, Somerville
- Miscellaneous Government, Somerville
- Miscellaneous Manufacturing, Somerville
- Miscellaneous Motor Vehicles, Somerville
- Miscellaneous Personal Services, Somerville
- Miscellaneous Photographers, Somerville
- Miscellaneous Professional, Somerville
- Mobile Home Contractors, Somerville
- Mobile Home Improvements & Repairs, Somerville
- Mobile Home Parks & Communities , Somerville
- Mobile Home Parks Development, Somerville
- Mobile Homes, Somerville
- Mobile Homes Manufactures, Somerville
- Modular & Mobile Homes For Sale, Somerville - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Somerville
- Mortgage Companies, Somerville
- Mortgages & Loans, Somerville
- Mosques, Somerville
- Motor Vehicle, Somerville
- Motor Vehicle Rental & Leasing, Somerville
- Motorcycle & Motor Scooters Dealers, Repair & Service, Somerville
- Motorcycle Parts, Accessories & Dealers, Somerville
- Motorcycle Repair & Service, Somerville
- Moving Companies, Somerville
- Moving Truck Rental , Somerville
- Muffler Shop & Exhaust Systems, Somerville
- Museums, Somerville
- Music, Somerville
- Music Lessons, Somerville
- Music Lessons - Instrumental, Somerville
- Music Lessons - Vocal, Somerville
- Music Sheet, Somerville
- Music Stores Retail, Somerville
- Musical Instrument Rental, Somerville - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Somerville
- Musical Instruments Repair, Sales & Service, Somerville
- Muslim Church, Somerville
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