- Machine Shop & Tool Repair Service, South Deerfield
- Machinery, Supplies & Equipment - Business Production Related, South Deerfield
- Machinery, Supplies & Equipment - Business Supplies Related, South Deerfield
- Machinery, Supplies & Equipment - Construction & Contractor Related, South Deerfield
- Management Consultants & Services, South Deerfield
- Manufacturing, South Deerfield
- Manufacturing Products, South Deerfield
- Martial Arts & Self Defense Schools, South Deerfield
- Masonry Contractors, South Deerfield - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, South Deerfield
- Massage Therapy, South Deerfield
- Meat Market, Wholesale & Products, South Deerfield
- Mechanical Engineer, South Deerfield - Mechanical Engineering Service
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- Medical Groups & Clinics, South Deerfield - Medical & Health Centers
- Mental Health Specialists, South Deerfield - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, South Deerfield
- Metal Forming Equipment, South Deerfield
- Mexican Restaurants, South Deerfield
- Miscellaneous Retail Stores, South Deerfield
- Miscellaneous Government, South Deerfield
- Miscellaneous Manufacturing, South Deerfield
- Miscellaneous Personal Services, South Deerfield
- Modular & Mobile Homes For Sale, South Deerfield - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, South Deerfield
- Motor Vehicle, South Deerfield
- Moving Companies, South Deerfield
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