- Machine Shop & Tool Repair Service, New Haven
- Machinery And Equipment Manufacturers, New Haven
- Machinery, Supplies & Equipment - Business Production Related, New Haven
- Machinery, Supplies & Equipment - Construction & Contractor Related, New Haven
- Manicurists & Pedicurists, New Haven
- Manufacturing, New Haven
- Manufacturing Products, New Haven
- Martial Arts & Self Defense Schools, New Haven
- Masonry Contractors, New Haven - Stone Mason, Brick Mason - Install & Repair
- Meat Market, Wholesale & Products, New Haven
- Mechanical Contractors, New Haven - Install, Service & Repair
- Mechanical Engineer, New Haven - Mechanical Engineering Service
- Medical Supplies & Equipment, New Haven
- Men's Clothing Stores, New Haven - Clothes & Accessories
- Merchandise Sales Events, New Haven
- Metal Repair Service & Blacksmith, New Haven - Iron Works
- Methodist Church, New Haven
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- Miscellaneous Agriculture, New Haven
- Miscellaneous Business Services, New Haven
- Miscellaneous Government, New Haven
- Miscellaneous Industry, New Haven
- Miscellaneous Manufacturing, New Haven
- Miscellaneous Photographers, New Haven
- Miscellaneous Professional, New Haven
- Mortgage Bankers & Correspondents, New Haven
- Mortgages & Loans, New Haven
- Motion Picture Pre & Post Production Services, New Haven
- Motor Vehicle, New Haven
- Motor Vehicle Rental & Leasing, New Haven
- Motorcycle & ATV Repair & Service, New Haven
- Motorcycle Parts, Accessories & Dealers, New Haven
- Motorcycle Repair & Service, New Haven
- Moving Companies, New Haven
- Mulch, Peat & Moss Products, New Haven
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