- Manufacturing, Hartford
- Manufacturing Products, Hartford
- Masonry Materials & Supplies, Hartford
- Mechanical Contractors, Hartford - Install, Service & Repair
- Medical & Health Service Organizations, Hartford
- Merle Norman Cosmetics, Hartford
- Metal Stampings Manufacturers, Hartford
- Methodist Church, Hartford
- Miscellaneous Government, Hartford
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- Miscellaneous Metal Work Manufacturers, Hartford
- Miscellaneous Personal Services, Hartford
- Miscellaneous Professional, Hartford
- Motor Vehicle, Hartford
- Motor Vehicle Rental & Leasing, Hartford
- Motorcycle Parts, Accessories & Dealers, Hartford
- Movie Theaters, Hartford
- Moving Truck Rental , Hartford
- Muffler Shop & Exhaust Systems, Hartford
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