- Machine Shop, Waltham
- Machine Shop & Tool Repair Service, Waltham
- Machine Shops Experimental, Waltham
- Machine Tools Manufacturers Metal Cutting Types, Waltham
- Machinery And Equipment Manufacturers, Waltham
- Machinery, Supplies & Equipment - Business Production Related, Waltham
- Machinery, Supplies & Equipment - Business Supplies Related, Waltham
- Machinery, Supplies & Equipment - Construction & Contractor Related, Waltham
- Mailbox Rental Services, Waltham
- Mailing, Delivery & Courier Service, Waltham
- Major Appliances, Waltham - Household & Kitchen
- Malls & Shopping Centers, Waltham
- Malpractice Attorneys & Lawyers, Waltham
- Malpractice Attorneys & Lawyers, Waltham
- Malpractice Lawyers & Attorneys, Waltham
- Management Consultants & Services, Waltham
- Manicurists & Pedicurists, Waltham
- Manufacturers Agents & Representatives, Waltham
- Manufacturers Representative, Waltham - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Waltham
- Manufacturing & Industrial Consultants, Waltham
- Manufacturing Equipment & Supplies, Waltham
- Manufacturing Products, Waltham
- Manufacturing Services, Waltham
- Maps & Globes, Waltham
- Marble, Waltham
- Marble & Terrazzo Flooring - Cleaning & Service, Waltham
- Market Research & Analysis , Waltham - Market Analysis, Business & Economic Research
- Marketing Consultants Professional Practices, Waltham
- Marketing Schools, Waltham
- Markets & Grocers Equipment, Waltham
- Marriage & Family Counselors, Waltham
- Martial Arts & Self Defense Schools, Waltham
- Masonry Contractors, Waltham - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Waltham
- Massage Therapists & Professional, Waltham
- Massage Therapy, Waltham
- Meat Market, Wholesale & Products, Waltham
- Mechanical Engineer, Waltham - Mechanical Engineering Service
- Medical Diagnostic Clinics, Waltham - Clinical Labs & Centers
- Medical Equipment Manufacturers, Waltham
- Medical Examiner, Waltham - Doctors, Physicians & Surgeons
- Medical Groups & Clinics, Waltham - Medical & Health Centers
- Medical Records Service , Waltham
- Medical Research, Waltham
- Medical Research & Development, Waltham - Medical Information & Research
- Medical Research Facilities, Waltham - Research & Development Centers
- Medical Supplies & Equipment, Waltham
- Medical Transcription Service, Waltham
- Membership Sports & Recreation Clubs, Waltham
- Mental Health Specialists, Waltham - Psychologist, Psychiatrist, Psychotherapist, etc
- Merger & Acquisition Services, Waltham
- Metal Finishers, Waltham
- Metal Plating & Polishing, Waltham
- Metal Repair Service & Blacksmith, Waltham - Iron Works
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- Metal Services, Waltham
- Metal Stampings Manufacturers, Waltham
- Metal Working Machinery, Waltham
- Methodist Church, Waltham
- Mexican Restaurants, Waltham
- Middle Eastern Restaurants, Waltham
- Milling Cutters, Waltham
- Millwork Contractors, Waltham
- Mini & Self Storage, Waltham
- Mirrors, Waltham - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Waltham
- Miscellaneous Household Item Repair, Waltham
- Miscellaneous Agriculture, Waltham
- Miscellaneous Business Services, Waltham
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Waltham
- Miscellaneous Government, Waltham
- Miscellaneous Industry, Waltham
- Miscellaneous Manufacturing, Waltham
- Miscellaneous Metal Work Manufacturers, Waltham
- Miscellaneous Personal Services, Waltham
- Miscellaneous Professional, Waltham
- Mission Churches, Waltham
- Model Trains, Waltham
- Monuments, Tombstones, Markers & Memorials, Waltham
- Mortgage Bankers & Correspondents, Waltham
- Mortgages & Loans, Waltham
- Mosquito Control, Waltham
- Motion Picture & Television Production Services, Waltham
- Motion Picture Film Libraries, Waltham
- Motion Picture Pre & Post Production Services, Waltham
- Motivational & Self Improvement Schools, Waltham
- Motor Vehicle, Waltham
- Motor Vehicle Rental & Leasing, Waltham
- Motorcycle & Motor Scooters Dealers, Repair & Service, Waltham
- Motorcycle Repair & Service, Waltham
- Movie Theaters, Waltham
- Moving & Storage Supplies & Equipment, Waltham
- Moving Companies, Waltham
- Moving Supplies & Equipment Rental, Waltham
- Moving Truck Rental , Waltham
- Muffler Shop & Exhaust Systems, Waltham
- Mulch, Peat & Moss Products, Waltham
- Multimedia Publishers, Waltham - Multimedia Services & Systems
- Museums, Waltham
- Music, Waltham
- Music Entertainment, Waltham
- Music Lessons, Waltham
- Music Lessons - Instrumental, Waltham
- Music Production Services, Waltham
- Musical Instrument Rental, Waltham - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Waltham
- Musical Instruments Repair, Sales & Service, Waltham
- Musical Recording Services, Waltham
- Musicians, Bands & Disc Jockeys, Waltham
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