- Machine Shop & Tool Repair Service, West Hartford
- Machinery And Equipment Manufacturers, West Hartford
- Machinery Repair & Rebuild, West Hartford
- Machinery, Supplies & Equipment - Business Production Related, West Hartford
- Machinery, Supplies & Equipment - Business Supplies Related, West Hartford
- Machinery, Supplies & Equipment - Construction & Contractor Related, West Hartford
- Mailbox Rental Services, West Hartford
- Mailing, Delivery & Courier Service, West Hartford
- Maintenance, Cleaning & Sanitation, West Hartford
- Major Appliance Repair & Service, West Hartford
- Major Appliances, West Hartford - Household & Kitchen
- Malls & Shopping Centers, West Hartford
- Management Consultants & Services, West Hartford
- Manicurists & Pedicurists, West Hartford
- Manufacturers Agents & Representatives, West Hartford
- Manufacturers Representative, West Hartford - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, West Hartford
- Manufacturing Products, West Hartford
- Manufacturing Services, West Hartford
- Marble, West Hartford
- Market Research & Analysis , West Hartford - Market Analysis, Business & Economic Research
- Marketing Consultants Professional Practices, West Hartford
- Marriage & Family Counselors, West Hartford
- Martial Arts & Self Defense Schools, West Hartford
- Masonry Contractors, West Hartford - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, West Hartford
- Massage Therapists & Professional, West Hartford
- Massage Therapy, West Hartford
- Mastectomy Apparel, Forms, Prostheses & Supplies, West Hartford
- Material Handling, West Hartford
- Material Handling Equipment, West Hartford - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, West Hartford
- Medical & Dental Management, West Hartford
- Medical Diagnostic Clinics, West Hartford - Clinical Labs & Centers
- Medical Diagnostic Imaging, West Hartford
- Medical Equipment Manufacturers, West Hartford
- Medical Supplies & Equipment, West Hartford
- Membership Sports & Recreation Clubs, West Hartford
- Men's Clothing Stores, West Hartford - Clothes & Accessories
- Mental Health Clinics, West Hartford - Treatment Centers
- Mental Health Specialists, West Hartford - Psychologist, Psychiatrist, Psychotherapist, etc
- Merle Norman Cosmetics, West Hartford
- Metal Coating & Allied Services, West Hartford
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- Metal Finishers, West Hartford
- Metal Heat Treating, West Hartford
- Metal Plating & Polishing, West Hartford
- Metal Repair Service & Blacksmith, West Hartford - Iron Works
- Metaphysical Churches, West Hartford
- Methodist Church, West Hartford
- Mexican Restaurants, West Hartford
- Middle Eastern Restaurants, West Hartford
- Midwives, West Hartford
- Mini & Self Storage, West Hartford
- Mirrors, West Hartford - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, West Hartford
- Miscellaneous Agriculture, West Hartford
- Miscellaneous Business Services, West Hartford
- Miscellaneous Government, West Hartford
- Miscellaneous Industry, West Hartford
- Miscellaneous Manufacturing, West Hartford
- Miscellaneous Personal Services, West Hartford
- Miscellaneous Photographers, West Hartford
- Miscellaneous Professional, West Hartford
- Mortgage Bankers & Correspondents, West Hartford
- Mortgages Commercial & Industrial, West Hartford
- Motion Picture & Television Production Services, West Hartford
- Motion Picture Pre & Post Production Services, West Hartford
- Motion Pictures Video Tape Duplication & Transfer Services, West Hartford
- Motor Vehicle, West Hartford
- Motor Vehicle Rental & Leasing, West Hartford
- Motorcycle Parts, Accessories & Dealers, West Hartford
- Movie Theaters, West Hartford
- Moving & Storage Supplies & Equipment, West Hartford
- Moving Companies, West Hartford
- Moving Supplies & Equipment Rental, West Hartford
- Moving Truck Rental , West Hartford
- Muffler Shop & Exhaust Systems, West Hartford
- Museums, West Hartford
- Music, West Hartford
- Music Entertainment, West Hartford
- Music Lessons, West Hartford
- Music Lessons - Instrumental, West Hartford
- Musical Instrument Rental, West Hartford - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, West Hartford
- Musical Instruments Repair, Sales & Service, West Hartford
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