- Machine Shop & Tool Repair Service, West Haven
- Machinery And Equipment Manufacturers, West Haven
- Machinery Custom Design Manufacturers, West Haven
- Machinery, Supplies & Equipment - Business Production Related, West Haven
- Machinery, Supplies & Equipment - Business Supplies Related, West Haven
- Machinery, Supplies & Equipment - Construction & Contractor Related, West Haven
- Mailboxes Retail, West Haven
- Mailing, Delivery & Courier Service, West Haven
- Major Appliances, West Haven - Household & Kitchen
- Malls & Shopping Centers, West Haven
- Management Consultants & Services, West Haven
- Manicurists & Pedicurists, West Haven
- Manufacturers Agents & Representatives, West Haven
- Manufacturers Representative, West Haven - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, West Haven
- Manufacturing Products, West Haven
- Marinas & Marina Services, West Haven
- Marriage & Family Counselors, West Haven
- Martial Arts & Self Defense Schools, West Haven
- Masonry Materials & Supplies, West Haven
- Mass Transit Vehicle Dealers, West Haven
- Meat Market, Wholesale & Products, West Haven
- Medical & Health Service Organizations, West Haven
- Medical Diagnostic Imaging, West Haven
- Medical Groups & Clinics, West Haven - Medical & Health Centers
- Membership Sports & Recreation Clubs, West Haven
- Mental Health Specialists, West Haven - Psychologist, Psychiatrist, Psychotherapist, etc
- Messenger Service, West Haven - Message Receiving & Forwarding Service
- Metal Perforating & Punching, West Haven
- Metal Plating & Polishing, West Haven
- Metal Repair Service & Blacksmith, West Haven - Iron Works
- Methodist Church, West Haven
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- Mexican Restaurants, West Haven
- Middle Eastern Restaurants, West Haven
- Military Supplies, West Haven
- Millwork Contractors, West Haven
- Mini & Self Storage, West Haven
- Ministries Church, West Haven
- Miscellaneous Business Product Repair, West Haven
- Miscellaneous Agriculture, West Haven
- Miscellaneous Business Services, West Haven
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, West Haven
- Miscellaneous Government, West Haven
- Miscellaneous Manufacturing, West Haven
- Miscellaneous Personal Services, West Haven
- Miscellaneous Professional, West Haven
- Moldings Materials, West Haven
- Money Transfer Service, West Haven
- Monuments, Tombstones, Markers & Memorials, West Haven
- Mortgage Bankers & Correspondents, West Haven
- Mortgage Companies, West Haven
- Mortgages & Loans, West Haven
- Mortgages Commercial & Industrial, West Haven
- Motor Vehicle, West Haven
- Motor Vehicle Rental & Leasing, West Haven
- Moving & Storage Supplies & Equipment, West Haven
- Moving Companies, West Haven
- Moving Truck Rental , West Haven
- Muffler Shop & Exhaust Systems, West Haven
- Museums, West Haven
- Music, West Haven
- Music Lessons, West Haven
- Music Lessons - Instrumental, West Haven
- Musical Recording Services, West Haven
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