- Machinery, Supplies & Equipment - Business Production Related, South Dennis
- Machinery, Supplies & Equipment - Business Supplies Related, South Dennis
- Mailing, Delivery & Courier Service, South Dennis
- Major Appliances, South Dennis - Household & Kitchen
- Mammography Clinics, South Dennis - Breast Cancer Screening
- Management Consultants & Services, South Dennis
- Manicurists & Pedicurists, South Dennis
- Manufacturing, South Dennis
- Manufacturing Products, South Dennis
- Marinas & Marina Services, South Dennis
- Marine Contractors & Designers, South Dennis
- Marine Products And Services, South Dennis
- Marine Repair & Service Stations, South Dennis
- Marine Supplies & Equipment Repair, South Dennis - Boat Supplies & Equipment
- Marriage & Family Counselors, South Dennis
- Masonry Contractors, South Dennis - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, South Dennis
- Massage Therapists & Professional, South Dennis
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- Massage Therapy, South Dennis
- Medical Alert Systems, South Dennis - Medical Alarms - PERS
- Medical Diagnostic Clinics, South Dennis - Clinical Labs & Centers
- Medical Supplies & Equipment, South Dennis
- Mental Health Specialists, South Dennis - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, South Dennis
- Miscellaneous Household Item Repair, South Dennis
- Miscellaneous Personal Services, South Dennis
- Motion Picture Pre & Post Production Services, South Dennis
- Motor Sports, South Dennis
- Motor Vehicle, South Dennis
- Motor Vehicle Rental & Leasing, South Dennis
- Movie Theaters, South Dennis
- Moving Companies, South Dennis
- Moving Truck Rental , South Dennis
- Mulch, Peat & Moss Products, South Dennis
- Musical Instrument Rental, South Dennis - Band & Orchestra Instruments
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