- Machine Shop & Tool Repair Service, Hartford
- Machinery And Equipment Manufacturers, Hartford
- Machinery, Supplies & Equipment - Business Production Related, Hartford
- Machinery, Supplies & Equipment - Construction & Contractor Related, Hartford
- Major Appliances, Hartford - Household & Kitchen
- Management Consultants & Services, Hartford
- Manufacturing, Hartford
- Manufacturing Products, Hartford
- Membership Sports & Recreation Clubs, Hartford
- Metal Finishers, Hartford
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- Metal Plating & Polishing, Hartford
- Methodist Church, Hartford
- Mexican Restaurants, Hartford
- Miscellaneous Government, Hartford
- Miscellaneous Personal Services, Hartford
- Miscellaneous Professional, Hartford
- Mobile Home Parks & Communities , Hartford
- Mortgage Bankers & Correspondents, Hartford
- Motor Vehicle, Hartford
- Museums, Hartford
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