- Machine Shop & Tool Repair Service, West Greenwich
- Machinery Movers & Erectors, West Greenwich
- Major Appliances, West Greenwich - Household & Kitchen
- Management Consultants & Services, West Greenwich
- Manicurists & Pedicurists, West Greenwich
- Manufacturing, West Greenwich
- Marine Surveyors & Adjustors, West Greenwich
- Masonry Materials & Supplies, West Greenwich
- Material Handling & Heavy Machinery & Equipment, West Greenwich
- Mechanical Engineer, West Greenwich - Mechanical Engineering Service
- Mental Health Specialists, West Greenwich - Psychologist, Psychiatrist, Psychotherapist, etc
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- Miscellaneous Government, West Greenwich
- Miscellaneous Industry, West Greenwich
- Miscellaneous Personal Services, West Greenwich
- Miscellaneous Professional, West Greenwich
- Mobile Home Parks & Communities , West Greenwich
- Mortgage Bankers & Correspondents, West Greenwich
- Motor Vehicle, West Greenwich
- Music, West Greenwich
- Musical Instruments & Equipment Stores, West Greenwich
- Musical Instruments - Guitars, West Greenwich
- Musical Recording Services, West Greenwich
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