- Machine Shop, East Hartford
- Machine Shop & Tool Repair Service, East Hartford
- Machinery And Equipment Manufacturers, East Hartford
- Machinery Installation Equipment & Supplies, East Hartford
- Machinery, Supplies & Equipment - Business Production Related, East Hartford
- Machinery, Supplies & Equipment - Business Supplies Related, East Hartford
- Machinery, Supplies & Equipment - Construction & Contractor Related, East Hartford
- Magazine & Newspaper Stands, East Hartford - Dealers & Distributors
- Mailing, Delivery & Courier Service, East Hartford
- Major Appliances, East Hartford - Household & Kitchen
- Malls & Shopping Centers, East Hartford
- Management Consultants & Services, East Hartford
- Management Research, East Hartford
- Manicurists & Pedicurists, East Hartford
- Manufacturers Agents & Representatives, East Hartford
- Manufacturers Representative, East Hartford - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, East Hartford
- Manufacturing Products, East Hartford
- Manufacturing Services, East Hartford
- Marine Electronic Equipment, East Hartford
- Marriage & Family Counselors, East Hartford
- Martial Arts & Self Defense Schools, East Hartford
- Masonry Contractors, East Hartford - Stone Mason, Brick Mason - Install & Repair
- Massage Therapy, East Hartford
- Material Handling & Heavy Machinery & Equipment, East Hartford
- Material Handling Equipment, East Hartford - Conveyor Belt, Pallet Jack, Forklift, etc
- Mechanical Contractors, East Hartford - Install, Service & Repair
- Mechanical Engineer, East Hartford - Mechanical Engineering Service
- Medical & Health Service Organizations, East Hartford
- Medical Billing Services, East Hartford
- Medical Diagnostic Clinics, East Hartford - Clinical Labs & Centers
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, East Hartford
- Medical Groups & Clinics, East Hartford - Medical & Health Centers
- Medical Supplies & Equipment, East Hartford
- Membership Sports & Recreation Clubs, East Hartford
- Mental Health Clinics, East Hartford - Treatment Centers
- Mental Health Specialists, East Hartford - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Marketing Consultants, East Hartford
- Metal Coating & Allied Services, East Hartford
- Metal Deburring, East Hartford
- Metal Plating & Polishing, East Hartford
- Metal Tanks, East Hartford
- Metal Working Machinery, East Hartford
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- Methodist Church, East Hartford
- Mexican Restaurants, East Hartford
- Middle Eastern Restaurants, East Hartford
- Millwork Contractors, East Hartford
- Mini & Self Storage, East Hartford
- Ministries Church, East Hartford
- Mirrors, East Hartford - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Credit Institutions & Services, East Hartford
- Miscellaneous Business Services, East Hartford
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, East Hartford
- Miscellaneous Government, East Hartford
- Miscellaneous Industry, East Hartford
- Miscellaneous Manufacturing, East Hartford
- Miscellaneous Personal Services, East Hartford
- Miscellaneous Professional, East Hartford
- Mobile Home Parks & Communities , East Hartford
- Model Trains, East Hartford
- Money Transfer Service, East Hartford
- Monuments, Tombstones, Markers & Memorials, East Hartford
- Mortgage Bankers & Correspondents, East Hartford
- Mortgage Companies, East Hartford
- Mortgages & Loans, East Hartford
- Motion Picture Pre & Post Production Services, East Hartford
- Motor Vehicle, East Hartford
- Motor Vehicle Rental & Leasing, East Hartford
- Motorcycle & Motor Scooters Dealers, Repair & Service, East Hartford
- Motorcycle Parts, Accessories & Dealers, East Hartford
- Motorcycle Repair & Service, East Hartford
- Movie Theaters, East Hartford
- Moving Companies, East Hartford
- Moving Supplies & Equipment Rental, East Hartford
- Moving Truck Rental , East Hartford
- Muffler Shop & Exhaust Systems, East Hartford
- Museums, East Hartford
- Music, East Hartford
- Music Lessons, East Hartford
- Music Lessons - Instrumental, East Hartford
- Music Production Services, East Hartford
- Musical Instrument Rental, East Hartford - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, East Hartford
- Musical Instruments Repair, Sales & Service, East Hartford
- Musical Recording Services, East Hartford
- Muslim Church, East Hartford
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