- Machine Shop & Tool Repair Service, North Smithfield
- Machinery And Equipment Manufacturers, North Smithfield
- Machinery Custom Design Manufacturers, North Smithfield
- Machinery, Supplies & Equipment - Business Production Related, North Smithfield
- Machinery, Supplies & Equipment - Business Supplies Related, North Smithfield
- Major Appliances, North Smithfield - Household & Kitchen
- Management Consultants & Services, North Smithfield
- Manicurists & Pedicurists, North Smithfield
- Manufacturing, North Smithfield
- Marriage & Family Counselors, North Smithfield
- Martial Arts & Self Defense Schools, North Smithfield
- Masonry Materials & Supplies, North Smithfield
- Material Handling Equipment, North Smithfield - Conveyor Belt, Pallet Jack, Forklift, etc
- Medical & Health Service Organizations, North Smithfield
- Medical Billing Services, North Smithfield
- Medical Supplies & Equipment, North Smithfield
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- Membership Sports & Recreation Clubs, North Smithfield
- Mexican Restaurants, North Smithfield
- Miscellaneous Business Product Repair, North Smithfield
- Miscellaneous Manufacturing, North Smithfield
- Miscellaneous Personal Services, North Smithfield
- Miscellaneous Photographers, North Smithfield
- Miscellaneous Professional, North Smithfield
- Mortgage Bankers & Correspondents, North Smithfield
- Motor Vehicle, North Smithfield
- Motor Vehicle Rental & Leasing, North Smithfield
- Movie Theaters, North Smithfield
- Moving Truck Rental , North Smithfield
- Music, North Smithfield
- Music Lessons, North Smithfield
- Music Lessons - Instrumental, North Smithfield
- Music Lessons - Vocal, North Smithfield
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