- Machine Shop & Tool Repair Service, Suffield
- Machinery, Supplies & Equipment - Business Production Related, Suffield
- Machinery, Supplies & Equipment - Business Supplies Related, Suffield
- Machinery, Supplies & Equipment - Construction & Contractor Related, Suffield
- Mailing, Delivery & Courier Service, Suffield
- Management Consultants & Services, Suffield
- Manicurists & Pedicurists, Suffield
- Manufacturing, Suffield
- Manufacturing Products, Suffield
- Medical Groups & Clinics, Suffield - Medical & Health Centers
- Mental Health Specialists, Suffield - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Buildings, Suffield - Kits, Homes, Steel Buildings, etc
- Mini & Self Storage, Suffield
- Mining, Suffield
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- Miscellaneous Agriculture, Suffield
- Miscellaneous Government, Suffield
- Miscellaneous Personal Services, Suffield
- Miscellaneous Professional, Suffield
- Mortgage Bankers & Correspondents, Suffield
- Motor Vehicle, Suffield
- Motor Vehicle Rental & Leasing, Suffield
- Moving Truck Rental , Suffield
- Muffler Shop & Exhaust Systems, Suffield
- Music, Suffield
- Music Production Services, Suffield
- Music Publishers & Distribution, Suffield
- Musical Recording Services, Suffield
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