- Machine Shop & Tool Repair Service, Hartford
- Machinery And Equipment Manufacturers, Hartford
- Machinery, Supplies & Equipment - Business Supplies Related, Hartford
- Machinery, Supplies & Equipment - Construction & Contractor Related, Hartford
- Major Appliances, Hartford - Household & Kitchen
- Manufacturing, Hartford
- Manufacturing Products, Hartford
- Masonry Materials & Supplies, Hartford
- Medical Supplies & Equipment, Hartford
- Methodist Church, Hartford
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- Mexican Restaurants, Hartford
- Miscellaneous Agriculture, Hartford
- Miscellaneous Government, Hartford
- Miscellaneous Personal Services, Hartford
- Monuments, Tombstones, Markers & Memorials, Hartford
- Mortgage Bankers & Correspondents, Hartford
- Motor Vehicle, Hartford
- Motor Vehicle Rental & Leasing, Hartford
- Moving Truck Rental , Hartford
- Muffler Shop & Exhaust Systems, Hartford
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