- Machinery, Supplies & Equipment - Business Production Related, Wellesley
- Machinery, Supplies & Equipment - Construction & Contractor Related, Wellesley
- Magazine & Newspaper Stands, Wellesley - Dealers & Distributors
- Major Appliances, Wellesley - Household & Kitchen
- Malls & Shopping Centers, Wellesley
- Management Consultants & Services, Wellesley
- Manicurists & Pedicurists, Wellesley
- Manufacturing, Wellesley
- Manufacturing Products, Wellesley
- Market Research & Analysis , Wellesley - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Wellesley
- Massage Therapists & Professional, Wellesley
- Massage Therapy, Wellesley
- Meat Market, Wholesale & Products, Wellesley
- Medical Supplies & Equipment, Wellesley
- Men's Clothing Stores, Wellesley - Clothes & Accessories
- Mental Health Specialists, Wellesley - Psychologist, Psychiatrist, Psychotherapist, etc
- Merger & Acquisition Services, Wellesley
- Metaphysical Churches, Wellesley
- Methodist Church, Wellesley
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- Mexican Restaurants, Wellesley
- Mini Golf Courses, Wellesley
- Miscellaneous Business Product Repair, Wellesley
- Miscellaneous Business Services, Wellesley
- Miscellaneous Government, Wellesley
- Miscellaneous Manufacturing, Wellesley
- Miscellaneous Personal Services, Wellesley
- Miscellaneous Professional, Wellesley
- Mortgage Bankers & Correspondents, Wellesley
- Motion Picture Pre & Post Production Services, Wellesley
- Motor Vehicle, Wellesley
- Movie Theaters, Wellesley
- Music, Wellesley
- Music Lessons, Wellesley
- Music Lessons - Instrumental, Wellesley
- Music Schools, Wellesley
- Musical Instrument Rental, Wellesley - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Wellesley
- Musical Instruments - Accordions, Wellesley
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