- Machine Shop & Tool Repair Service, Stonington
- Mailing, Delivery & Courier Service, Stonington
- Management Consultants & Services, Stonington
- Manicurists & Pedicurists, Stonington
- Manufacturing, Stonington
- Manufacturing Products, Stonington
- Marinas & Marina Services, Stonington
- Marriage & Family Counselors, Stonington
- Marriage & Family Counselors Information & Referrals, Stonington
- Martial Arts & Self Defense Schools, Stonington
- Massage Therapy, Stonington
- Mats & Matting, Stonington
- Meat Market, Wholesale & Products, Stonington
- Mechanical Engineer, Stonington - Mechanical Engineering Service
- Medical Billing Services, Stonington
- Membership Sports & Recreation Clubs, Stonington
- Mental Health Specialists, Stonington - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Marketing Consultants, Stonington
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- Methodist Church, Stonington
- Microfilm & Imaging Service, Equipment & Supplies , Stonington
- Microfilming & Imaging Service, Stonington
- Miscellaneous Personal Services, Stonington
- Miscellaneous Professional, Stonington
- Miscellaneous Toys & Supplies, Stonington
- Motion Picture Pre & Post Production Services, Stonington
- Motor Vehicle, Stonington
- Movie Theaters, Stonington
- Museums, Stonington
- Music, Stonington
- Music Lessons, Stonington
- Music Lessons - Instrumental, Stonington
- Musical Instrument Manufacturers, Stonington
- Musical Instrument Rental, Stonington - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Stonington
- Musical Instruments Repair, Sales & Service, Stonington
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