- Machine Shop, Smithfield
- Machinery, Supplies & Equipment - Business Production Related, Smithfield
- Machinery, Supplies & Equipment - Business Supplies Related, Smithfield
- Machinery, Supplies & Equipment - Construction & Contractor Related, Smithfield
- Mailbox Rental Services, Smithfield
- Mailing, Delivery & Courier Service, Smithfield
- Management Consultants & Services, Smithfield
- Manicurists & Pedicurists, Smithfield
- Manufacturing, Smithfield
- Manufacturing & Industrial Consultants, Smithfield
- Manufacturing Products, Smithfield
- Masonry Contractors, Smithfield - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Smithfield
- Meat Packers, Smithfield
- Medical & Health Service Organizations, Smithfield
- Medical Billing Services, Smithfield
- Medical Diagnostic Clinics, Smithfield - Clinical Labs & Centers
- Medical Supplies & Equipment, Smithfield
- Meeting & Event Planning Services, Smithfield - Conference Consultants
- Membership Sports & Recreation Clubs, Smithfield
- Mental Health Clinics, Smithfield - Treatment Centers
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- Methodist Church, Smithfield
- Mexican Restaurants, Smithfield
- Mining, Smithfield
- Miscellaneous Agriculture, Smithfield
- Miscellaneous Government, Smithfield
- Miscellaneous Industry, Smithfield
- Miscellaneous Personal Services, Smithfield
- Miscellaneous Professional, Smithfield
- Mobile Home Parks & Communities , Smithfield
- Modular & Mobile Homes For Sale, Smithfield - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Smithfield
- Mortgage Bankers & Correspondents, Smithfield
- Mortgages & Loans, Smithfield
- Motion Picture Pre & Post Production Services, Smithfield
- Motor Vehicle, Smithfield
- Motor Vehicle Rental & Leasing, Smithfield
- Moving & Storage Supplies & Equipment, Smithfield
- Moving Companies, Smithfield
- Moving Truck Rental , Smithfield
- Music, Smithfield
- Musical Instruments & Equipment Stores, Smithfield
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