- Machine Shop, Groton
- Machine Shop & Tool Repair Service, Groton
- Machinery, Supplies & Equipment - Business Production Related, Groton
- Machinery, Supplies & Equipment - Business Supplies Related, Groton
- Mailbox Rental Services, Groton
- Mailing, Delivery & Courier Service, Groton
- Major Appliances, Groton - Household & Kitchen
- Malls & Shopping Centers, Groton
- Management Consultants & Services, Groton
- Manicurists & Pedicurists, Groton
- Manufacturing, Groton
- Manufacturing Products, Groton
- Marinas & Marina Services, Groton
- Marine Contractors & Designers, Groton
- Marine Electronic Equipment, Groton
- Marine Engineers, Groton
- Marine Pilot & Operator Service, Groton
- Marine Products And Services, Groton
- Marine Repair & Service Stations, Groton
- Marine Salvage & Wrecking Services, Groton
- Marine Services, Groton
- Marine Supplies & Equipment, Groton - Boat Supplies
- Marine Supplies & Equipment - Boat Engine & Drive Train Repair, Groton
- Marine Surveyors & Adjustors, Groton
- Market Research & Analysis , Groton - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Groton
- Martial Arts & Self Defense Schools, Groton
- Masonry Contractors, Groton - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Groton
- Massage Equipment & Supplies, Groton
- Massage Therapy, Groton
- Mausoleums Developers, Groton
- Meat Market, Wholesale & Products, Groton
- Medical Supplies & Equipment, Groton
- Membership Sports & Recreation Clubs, Groton
- Men's & Boys Clothing & Accessories Stores, Groton
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- Mens & Boys Belts & Suspenders, Groton
- Mental Health Clinics, Groton - Treatment Centers
- Mental Health Specialists, Groton - Psychologist, Psychiatrist, Psychotherapist, etc
- Mexican Restaurants, Groton
- Middle Eastern Restaurants, Groton
- Military Supplies, Groton
- Mini & Self Storage, Groton
- Mini Golf Courses, Groton
- Mining, Groton
- Miscellaneous Business Product Repair, Groton
- Miscellaneous Government, Groton
- Miscellaneous Personal Services, Groton
- Miscellaneous Photographers, Groton
- Miscellaneous Professional, Groton
- Mobile Home Contractors, Groton
- Mobile Home Improvements & Repairs, Groton
- Modular & Mobile Homes For Sale, Groton - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Groton
- Mortgage Bankers & Correspondents, Groton
- Motion Picture Pre & Post Production Services, Groton
- Motor Vehicle, Groton
- Motor Vehicle Rental & Leasing, Groton
- Motorcycle Parts, Accessories & Dealers, Groton
- Movie Theaters, Groton
- Moving & Storage Supplies & Equipment, Groton
- Moving Companies, Groton
- Moving Supplies & Equipment Rental, Groton
- Moving Truck Rental , Groton
- Muffler Shop & Exhaust Systems, Groton
- Museums, Groton
- Music, Groton
- Music Production Services, Groton
- Musical Instrument Rental, Groton - Band & Orchestra Instruments
- Musical Instruments Repair, Sales & Service, Groton
- Musical Recording Services, Groton
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