- Machine Shop, Boston
- Machine Shop & Tool Repair Service, Boston
- Machine Shops Experimental, Boston
- Machine Tools Manufacturers Metal Cutting Types, Boston
- Machinery And Equipment Manufacturers, Boston
- Machinery Movers & Erectors, Boston
- Machinery, Supplies & Equipment - Business Production Related, Boston
- Machinery, Supplies & Equipment - Business Supplies Related, Boston
- Machinery, Supplies & Equipment - Construction & Contractor Related, Boston
- Magazine & Newspaper Stands, Boston - Dealers & Distributors
- Magazine Ads, Boston - Periodical Advertising
- Magicians & Jugglers Equipment & Supplies, Boston
- Mailbox Rental Services, Boston
- Mailing List Service, Brokers & Compilers, Boston
- Mailing, Delivery & Courier Service, Boston
- Maintenance, Cleaning & Sanitation, Boston
- Major Appliance Repair & Service, Boston
- Major Appliances, Boston - Household & Kitchen
- Malls & Shopping Centers, Boston
- Malpractice Attorneys & Lawyers, Boston
- Malpractice Attorneys & Lawyers, Boston
- Malpractice Lawyers & Attorneys, Boston
- Management Consultants & Services, Boston
- Management Training & Development, Boston
- Mandarin Restaurants, Boston
- Manicurists & Pedicurists, Boston
- Manifold Business Forms Manufacturers, Boston
- Manufacturers Agents & Representatives, Boston
- Manufacturers Representative, Boston - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Boston
- Manufacturing & Industrial Consultants, Boston
- Manufacturing Equipment & Supplies, Boston
- Manufacturing Products, Boston
- Map Publishers & Printers, Boston
- Mapping & Topographical Services, Boston
- Marble, Boston
- Marble & Terrazzo Flooring - Cleaning & Service, Boston
- Marinas & Aquariums, Boston
- Marinas & Marina Services, Boston
- Marine Contractors & Designers, Boston
- Marine Engineers, Boston
- Marine Personnel Transportation, Boston
- Marine Pilot & Operator Service, Boston
- Marine Products And Services, Boston
- Marine Repair & Service Stations, Boston
- Marine Services, Boston
- Marine Supplies & Equipment, Boston - Boat Supplies
- Marine Supplies & Equipment Repair, Boston - Boat Supplies & Equipment
- Market Research & Analysis , Boston - Market Analysis, Business & Economic Research
- Marketing Consultants Professional Practices, Boston
- Marketing Schools, Boston
- Marriage & Family Counselors, Boston
- Marriage & Family Counselors Information & Referrals, Boston
- Martial Arts & Self Defense Schools, Boston
- Masonry Contractors, Boston - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Boston
- Massage Therapists & Professional, Boston
- Massage Therapy, Boston
- Material Handling & Heavy Machinery & Equipment, Boston
- Maternity Clothes & Clothing Stores, Boston - Maternity Dress, Gown, Swimwear, Underwear & More
- Mats & Matting, Boston
- Meat Market, Wholesale & Products, Boston
- Meat Packers, Boston
- Mechanical Contractors, Boston - Install, Service & Repair
- Mechanical Engineer, Boston - Mechanical Engineering Service
- Medical & Dental Management, Boston
- Medical & Health Service Organizations, Boston
- Medical & Infectious Waste Disposal, Boston
- Medical Diagnostic Clinics, Boston - Clinical Labs & Centers
- Medical Groups & Clinics, Boston - Medical & Health Centers
- Medical Identification Jewelry, Boston
- Medical Management & Business Administration Service, Boston
- Medical Research, Boston
- Medical Research & Development, Boston - Medical Information & Research
- Medical Research Facilities, Boston - Research & Development Centers
- Medical Supplies & Equipment, Boston
- Medieval Restaurants, Boston
- Mediterranean Restaurants, Boston
- Meeting & Event Planning Services, Boston - Conference Consultants
- Membership Organizations, Boston
- Membership Sports & Recreation Clubs, Boston
- Men's & Boys Clothing & Accessories Stores, Boston
- Men's Clothing Stores, Boston - Clothes & Accessories
- Men's Shoe Stores, Boston
- Mennonite Church, Boston
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- Mens & Boys Jeans & Western Wear Stores, Boston
- Mens & Womens Clothing, Boston
- Mental & Developmental Information & Referral Services, Boston
- Mental Health Clinics, Boston - Treatment Centers
- Mental Health Specialists, Boston - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Boston
- Merger & Acquisition Services, Boston
- Messenger Service, Boston - Message Receiving & Forwarding Service
- Metal Forming Equipment, Boston
- Metal Forming Machinery, Boston
- Metal Repair Service & Blacksmith, Boston - Iron Works
- Metal Working Machinery, Boston
- Metaphysical Churches, Boston
- Methodist Church, Boston
- Mexican Restaurants, Boston
- Middle Eastern Restaurants, Boston
- Mildew Removal & Control, Boston - Mold Removal
- Military Supplies, Boston
- Minerals, Boston
- Mini & Self Storage, Boston
- Mining, Boston
- Ministries Church, Boston
- Mirrors, Boston - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Credit Institutions & Services, Boston
- Miscellaneous Business Manufacturing, Boston
- Miscellaneous Business Product Repair, Boston
- Miscellaneous Household Item Repair, Boston
- Miscellaneous Prosthesis & Appliances, Boston
- Miscellaneous Agriculture, Boston
- Miscellaneous Business Services, Boston
- Miscellaneous Government, Boston
- Miscellaneous Industry, Boston
- Miscellaneous Manufacturing, Boston
- Miscellaneous Personal Services, Boston
- Miscellaneous Photographers, Boston
- Miscellaneous Professional, Boston
- Mission Churches, Boston
- Mobile Coffee & Food Service, Boston
- Mobile Coffee & Food Service, Boston
- Mobile Home Parks & Communities , Boston
- Mobile Restaurants, Boston
- Model Jewelry, Boston
- Modeling & Talent Agencies, Boston
- Money Transfer Service, Boston
- Mortgage Bankers & Correspondents, Boston
- Mortgages & Loans, Boston
- Motion Picture & Television Production Services, Boston
- Motion Picture Dists Exchanges & Representatives, Boston
- Motion Picture Film Editing Facilities Renting, Boston
- Motion Picture Pre & Post Production Services, Boston
- Motion Picture Special Effects, Boston
- Motion Pictures Studios & Location Sets, Boston
- Motion Pictures Video Tape Duplication & Transfer Services, Boston
- Motor Vehicle, Boston
- Motor Vehicle Rental & Leasing, Boston
- Motorcycle Parts, Accessories & Dealers, Boston
- Movie Memorabilia, Boston
- Movie Theaters, Boston
- Moving & Storage Supplies & Equipment, Boston
- Moving Companies, Boston
- Moving Services - Labor & Material, Boston
- Moving Supplies & Equipment Rental, Boston
- Moving Truck Rental , Boston
- Muffler Shop & Exhaust Systems, Boston
- Multimedia Publishers, Boston - Multimedia Services & Systems
- Murals & Faux Finish Walls, Boston
- Museums, Boston
- Music, Boston
- Music Composers Agents, Boston
- Music Entertainment, Boston
- Music Lessons, Boston
- Music Lessons - Instrumental, Boston
- Music Lessons - Vocal, Boston
- Music Schools, Boston
- Music Sheet, Boston
- Music Stores Retail, Boston
- Music Writers Supplies, Boston
- Musical Instrument Manufacturers, Boston
- Musical Instrument Rental, Boston - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Boston
- Musical Instruments - Violins, Boston
- Musical Instruments Repair, Sales & Service, Boston
- Musical Instruments Supplies & Accessories Manufacturers, Boston
- Musical Recording Services, Boston
- Musicians, Bands & Disc Jockeys, Boston
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