- Machine Shop & Tool Repair Service, New Haven
- Machinery And Equipment Manufacturers, New Haven
- Machinery, Supplies & Equipment - Construction & Contractor Related, New Haven
- Maintenance, Cleaning & Sanitation, New Haven
- Major Appliances, New Haven - Household & Kitchen
- Manufacturing, New Haven
- Manufacturing Products, New Haven
- Meat Market, Wholesale & Products, New Haven
- Metal Finishers, New Haven
- Metal Plating & Polishing, New Haven
- Methodist Church, New Haven
- Mexican Restaurants, New Haven
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- Mini & Self Storage, New Haven
- Miscellaneous Agriculture, New Haven
- Miscellaneous Government, New Haven
- Miscellaneous Personal Services, New Haven
- Miscellaneous Photographers, New Haven
- Miscellaneous Professional, New Haven
- Mortgage Bankers & Correspondents, New Haven
- Mortgage Companies, New Haven
- Motor Vehicle, New Haven
- Movie Theaters, New Haven
- Music, New Haven
- Musical Instruments & Equipment Stores, New Haven
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