- Machine Shop & Tool Repair Service, Hartford
- Machine Tool Repair & Rebuild, Hartford
- Machinery And Equipment Manufacturers, Hartford
- Machinery, Supplies & Equipment - Business Production Related, Hartford
- Machinery, Supplies & Equipment - Business Supplies Related, Hartford
- Machinery, Supplies & Equipment - Construction & Contractor Related, Hartford
- Major Appliances, Hartford - Household & Kitchen
- Manicurists & Pedicurists, Hartford
- Manufacturing, Hartford
- Manufacturing Products, Hartford
- Marriage & Family Counselors, Hartford
- Masonry Materials & Supplies, Hartford
- Massage Therapy, Hartford
- Meat Market, Wholesale & Products, Hartford
- Medical Supplies & Equipment, Hartford
- Membership Sports & Recreation Clubs, Hartford
- Mental Health Specialists, Hartford - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Hartford
- Metal Working Machinery, Hartford
- Methodist Church, Hartford
- Mexican Restaurants, Hartford
- Mini & Self Storage, Hartford
- Mining, Hartford
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- Mirrors, Hartford - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Agriculture, Hartford
- Miscellaneous Business Services, Hartford
- Miscellaneous Government, Hartford
- Miscellaneous Personal Services, Hartford
- Miscellaneous Photographers, Hartford
- Miscellaneous Professional, Hartford
- Mobile Home Parks & Communities , Hartford
- Modular & Mobile Homes For Sale, Hartford - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Hartford
- Mortgage Bankers & Correspondents, Hartford
- Mortgages & Loans, Hartford
- Motion Picture Pre & Post Production Services, Hartford
- Motor Vehicle, Hartford
- Motor Vehicle Rental & Leasing, Hartford
- Motorcycle & ATV Repair & Service, Hartford
- Motorcycle & Motor Scooters Dealers, Repair & Service, Hartford
- Motorcycle Repair & Service, Hartford
- Movie Theaters, Hartford
- Moving Supplies & Equipment Rental, Hartford
- Moving Truck Rental , Hartford
- Muffler Shop & Exhaust Systems, Hartford
- Museums, Hartford
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