- Machine Shop, North Kingstown
- Machine Shop & Tool Repair Service, North Kingstown
- Machinery Repair & Rebuild, North Kingstown
- Machinery, Supplies & Equipment - Business Production Related, North Kingstown
- Machinery, Supplies & Equipment - Business Supplies Related, North Kingstown
- Machinery, Supplies & Equipment - Construction & Contractor Related, North Kingstown
- Mailing, Delivery & Courier Service, North Kingstown
- Major Appliances, North Kingstown - Household & Kitchen
- Malls & Shopping Centers, North Kingstown
- Management Consultants & Services, North Kingstown
- Manicurists & Pedicurists, North Kingstown
- Manufacturers Agents & Representatives, North Kingstown
- Manufacturers Representative, North Kingstown - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, North Kingstown
- Manufacturing & Industrial Consultants, North Kingstown
- Manufacturing Products, North Kingstown
- Marinas & Marina Services, North Kingstown
- Marine Products And Services, North Kingstown
- Marine Services, North Kingstown
- Marine Supplies & Equipment, North Kingstown - Boat Supplies
- Marine Surveyors & Adjustors, North Kingstown
- Marriage & Family Counselors, North Kingstown
- Martial Arts & Self Defense Schools, North Kingstown
- Masonry Contractors, North Kingstown - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, North Kingstown
- Massage Therapists & Professional, North Kingstown
- Massage Therapy, North Kingstown
- Material Handling Consultants, North Kingstown
- Measuring Equipment, North Kingstown
- Meat Market, Wholesale & Products, North Kingstown
- Mechanical Engineer, North Kingstown - Mechanical Engineering Service
- Medical Records Service , North Kingstown
- Medical Research, North Kingstown
- Medical Research & Development, North Kingstown - Medical Information & Research
- Medical Supplies & Equipment, North Kingstown
- Membership Sports & Recreation Clubs, North Kingstown
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- Mental Health Specialists, North Kingstown - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Buildings, North Kingstown - Kits, Homes, Steel Buildings, etc
- Metal Coating & Allied Services, North Kingstown
- Metal Deburring, North Kingstown
- Metal Finishers, North Kingstown
- Metal Plating & Polishing, North Kingstown
- Metal Repair Service & Blacksmith, North Kingstown - Iron Works
- Metal Stampings Manufacturers, North Kingstown
- Methodist Church, North Kingstown
- Mexican Restaurants, North Kingstown
- Micrometers, North Kingstown
- Miscellaneous Household Item Repair, North Kingstown
- Miscellaneous Agriculture, North Kingstown
- Miscellaneous Government, North Kingstown
- Miscellaneous Industry, North Kingstown
- Miscellaneous Manufacturing, North Kingstown
- Miscellaneous Metal Work Manufacturers, North Kingstown
- Miscellaneous Personal Services, North Kingstown
- Miscellaneous Professional, North Kingstown
- Mobile Home Parks & Communities , North Kingstown
- Modular & Mobile Homes For Sale, North Kingstown - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, North Kingstown
- Mortgages & Loans, North Kingstown
- Motor Vehicle, North Kingstown
- Motor Vehicle Rental & Leasing, North Kingstown
- Motorcycle Parts, Accessories & Dealers, North Kingstown
- Moving Companies, North Kingstown
- Moving Supplies & Equipment Rental, North Kingstown
- Moving Truck Rental , North Kingstown
- Muffler Shop & Exhaust Systems, North Kingstown
- Mulch, Peat & Moss Products, North Kingstown
- Museums, North Kingstown
- Music, North Kingstown
- Music Lessons, North Kingstown
- Music Lessons - Instrumental, North Kingstown
- Musical Recording Services, North Kingstown
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