- Machine Shop & Tool Repair Service, Westerly
- Machinery, Supplies & Equipment - Business Production Related, Westerly
- Machinery, Supplies & Equipment - Business Supplies Related, Westerly
- Machinery, Supplies & Equipment - Construction & Contractor Related, Westerly
- Mailing, Delivery & Courier Service, Westerly
- Maintenance, Cleaning & Sanitation, Westerly
- Major Appliances, Westerly - Household & Kitchen
- Management Consultants & Services, Westerly
- Manicurists & Pedicurists, Westerly
- Manufacturing, Westerly
- Manufacturing Products, Westerly
- Marinas & Marina Services, Westerly
- Marine Cargo Handling, Westerly
- Marine Products And Services, Westerly
- Marine Repair & Service Stations, Westerly
- Marine Supplies & Equipment - Boat Engine & Drive Train Repair, Westerly
- Marriage & Family Counselors, Westerly
- Martial Arts & Self Defense Schools, Westerly
- Masonry Contractors, Westerly - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Westerly
- Massage Therapists & Professional, Westerly
- Massage Therapy, Westerly
- Maternity Clothes & Clothing Stores, Westerly - Maternity Dress, Gown, Swimwear, Underwear & More
- Meat Market, Wholesale & Products, Westerly
- Medical Supplies & Equipment, Westerly
- Membership Sports & Recreation Clubs, Westerly
- Men's Clothing Stores, Westerly - Clothes & Accessories
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- Mental Health Specialists, Westerly - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, Westerly - Iron Works
- Methodist Church, Westerly
- Mexican Restaurants, Westerly
- Mildew Removal & Control, Westerly - Mold Removal
- Mini & Self Storage, Westerly
- Miscellaneous Business Services, Westerly
- Miscellaneous Industry, Westerly
- Miscellaneous Manufacturing, Westerly
- Miscellaneous Personal Services, Westerly
- Miscellaneous Photographers, Westerly
- Miscellaneous Professional, Westerly
- Modeling & Talent Agencies, Westerly
- Monuments, Tombstones, Markers & Memorials, Westerly
- Motion Picture Pre & Post Production Services, Westerly
- Motor Vehicle, Westerly
- Motor Vehicle Rental & Leasing, Westerly
- Motorcycle & Motor Scooters Dealers, Repair & Service, Westerly
- Motorcycle Parts, Accessories & Dealers, Westerly
- Motorcycle Repair & Service, Westerly
- Moving & Storage Supplies & Equipment, Westerly
- Moving Companies, Westerly
- Moving Truck Rental , Westerly
- Music, Westerly
- Musical Instrument Rental, Westerly - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Westerly
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