- Machinery, Supplies & Equipment - Business Production Related, West Yarmouth
- Machinery, Supplies & Equipment - Construction & Contractor Related, West Yarmouth
- Maintenance, Cleaning & Sanitation, West Yarmouth
- Major Appliances, West Yarmouth - Household & Kitchen
- Management Consultants & Services, West Yarmouth
- Manicurists & Pedicurists, West Yarmouth
- Manufacturing, West Yarmouth
- Manufacturing Products, West Yarmouth
- Marine Contractors & Designers, West Yarmouth
- Market Research & Analysis , West Yarmouth - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, West Yarmouth
- Martial Arts & Self Defense Schools, West Yarmouth
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- Masonry Contractors, West Yarmouth - Stone Mason, Brick Mason - Install & Repair
- Massage Therapy, West Yarmouth
- Material Handling & Heavy Machinery & Equipment, West Yarmouth
- Medical & Health Service Organizations, West Yarmouth
- Medical Supplies & Equipment, West Yarmouth
- Mental Health Specialists, West Yarmouth - Psychologist, Psychiatrist, Psychotherapist, etc
- Mildew Removal & Control, West Yarmouth - Mold Removal
- Mini Golf Courses, West Yarmouth
- Miscellaneous Personal Services, West Yarmouth
- Miscellaneous Professional, West Yarmouth
- Motor Vehicle, West Yarmouth
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