- Machinery, Supplies & Equipment - Business Production Related, Somerville
- Machinery, Supplies & Equipment - Business Supplies Related, Somerville
- Magazine & Newspaper Stands, Somerville - Dealers & Distributors
- Mailbox Rental Services, Somerville
- Mailing, Delivery & Courier Service, Somerville
- Maintenance, Cleaning & Sanitation, Somerville
- Major Appliance Repair & Service, Somerville
- Major Appliances, Somerville - Household & Kitchen
- Make Up & Cosmetics Application, Somerville
- Management Consultants & Services, Somerville
- Mandarin Restaurants, Somerville
- Manicurists & Pedicurists, Somerville
- Manufacturers Agents & Representatives, Somerville
- Manufacturers Representative, Somerville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Somerville
- Manufacturing Products, Somerville
- Maps & Supplies, Somerville
- Marble Tiles, Somerville
- Market Research & Analysis , Somerville - Market Analysis, Business & Economic Research
- Marketing Consultants Professional Practices, Somerville
- Marriage & Family Counselors, Somerville
- Marriage & Family Counselors Information & Referrals, 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
- Meat Market, Wholesale & Products, Somerville
- Mechanical Contractors, Somerville - Install, Service & Repair
- Medical & Dental Management, Somerville
- Medical & Health Service Organizations, Somerville
- Medical Alert Systems, Somerville - Medical Alarms - PERS
- Medical Diagnostic Clinics, Somerville - Clinical Labs & Centers
- Medical Groups & Clinics, Somerville - Medical & Health Centers
- Medical Management & Business Administration Service, Somerville
- Medical Supplies & Equipment, Somerville
- Membership Sports & Recreation Clubs, Somerville
- Men's Clothing Stores, Somerville - Clothes & Accessories
- Mental Health Clinics, Somerville - Treatment Centers
- Mental Health Specialists, Somerville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Pricing Equipment, Somerville
- Metal Finishers, Somerville
- Metal Plating & Polishing, Somerville
- Metal Repair Service & Blacksmith, Somerville - Iron Works
- Metal Stampings Manufacturers, Somerville
- Metaphysical Churches, Somerville
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- Methodist Church, Somerville
- Mexican Restaurants, Somerville
- Middle Eastern Restaurants, Somerville
- Millwork Contractors, Somerville
- Mini & Self Storage, Somerville
- Mining, Somerville
- Ministries Church, Somerville
- Mirrors, Somerville - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Somerville
- Miscellaneous Business Services, Somerville
- Miscellaneous Government, Somerville
- Miscellaneous Manufacturing, Somerville
- Miscellaneous Metal Work Manufacturers, Somerville
- Miscellaneous Personal Services, Somerville
- Miscellaneous Photographers, Somerville
- Miscellaneous Professional, Somerville
- Mission Churches, Somerville
- Modular Homes - Rentals & Leases, Somerville
- Money Transfer Service, Somerville
- Moroccan Restaurants, Somerville
- Mortgage Bankers & Correspondents, Somerville
- Motion Picture & Television Production Services, Somerville
- Motion Picture Pre & Post Production Services, Somerville
- Motion Pictures Video Tape Duplication & Transfer Services, Somerville
- Motor Vehicle, Somerville
- Motor Vehicle Rental & Leasing, Somerville
- Motorcycle Parts, Accessories & Dealers, Somerville
- Movie Theaters, Somerville
- Moving & Storage Supplies & Equipment, Somerville
- Moving Companies, Somerville
- Moving Supplies & Equipment Rental, Somerville
- Moving Truck Rental , Somerville
- Muffler Shop & Exhaust Systems, Somerville
- Museums, Somerville
- Music, Somerville
- Music Background Leased, Somerville
- Music Entertainment, Somerville
- Music Lessons, Somerville
- Music Lessons - Vocal, Somerville
- Music Sheet, Somerville
- Music Stores Retail, Somerville
- Music Writers Supplies, Somerville
- Musical Instrument Rental, Somerville - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Somerville
- Musical Instruments Repair, Sales & Service, Somerville
- Musical Recording Services, Somerville
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