- Machine Shop, North Haven
- Machine Shop & Tool Repair Service, North Haven
- Machine Shops Slings, North Haven
- Machinery And Equipment Manufacturers, North Haven
- Machinery, Supplies & Equipment - Business Production Related, North Haven
- Machinery, Supplies & Equipment - Business Supplies Related, North Haven
- Machinery, Supplies & Equipment - Construction & Contractor Related, North Haven
- Mailing, Delivery & Courier Service, North Haven
- Maintenance, Cleaning & Sanitation, North Haven
- Major Appliance Repair & Service, North Haven
- Major Appliances, North Haven - Household & Kitchen
- Management Consultants & Services, North Haven
- Manicurists & Pedicurists, North Haven
- Manufacturers Agents & Representatives, North Haven
- Manufacturers Representative, North Haven - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, North Haven
- Manufacturing & Industrial Consultants, North Haven
- Manufacturing Products, North Haven
- Manufacturing Services, North Haven
- Marble, North Haven
- Market Research & Analysis , North Haven - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, North Haven
- Martial Arts & Self Defense Schools, North Haven
- Masonry Contractors, North Haven - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, North Haven
- Material Handling & Heavy Machinery & Equipment, North Haven
- Material Handling Consultants, North Haven
- Material Handling Equipment, North Haven - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, North Haven
- Mechanical Contractors, North Haven - Install, Service & Repair
- Medical & Health Service Organizations, North Haven
- Medical Diagnostic Clinics, North Haven - Clinical Labs & Centers
- Medical Diagnostic Imaging, North Haven
- Medical Supplies & Equipment, North Haven
- Membership Sports & Recreation Clubs, North Haven
- Mental Health Specialists, North Haven - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Boxes & Containers, North Haven
- Metal Cans Manufacturers, North Haven
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- Metal Coating & Allied Services, North Haven
- Methodist Church, North Haven
- Mexican Restaurants, North Haven
- Mildew Removal & Control, North Haven - Mold Removal
- Mini & Self Storage, North Haven
- Mining, North Haven
- Miscellaneous Household Item Repair, North Haven
- Miscellaneous Business Services, North Haven
- Miscellaneous Government, North Haven
- Miscellaneous Industry, North Haven
- Miscellaneous Manufacturing, North Haven
- Miscellaneous Personal Services, North Haven
- Miscellaneous Photographers, North Haven
- Miscellaneous Professional, North Haven
- Mission Churches, North Haven
- Modular Buildings, North Haven - Modular Homes Buildings & Offices
- Monuments, Tombstones, Markers & Memorials, North Haven
- Mortgage Bankers & Correspondents, North Haven
- Mortgages & Loans, North Haven
- Motion Picture Pre & Post Production Services, North Haven
- Motor Vehicle, North Haven
- Motor Vehicle Rental & Leasing, North Haven
- Motorcycle & Motor Scooters Dealers, Repair & Service, North Haven
- Motorcycle Parts, Accessories & Dealers, North Haven
- Motorcycle Repair & Service, North Haven
- Motorcycles Paint & Refinishing, North Haven
- Movie Theaters, North Haven
- Moving & Storage Supplies & Equipment, North Haven
- Moving Companies, North Haven
- Moving Truck Rental , North Haven
- Muffler Shop & Exhaust Systems, North Haven
- Music, North Haven
- Music Lessons, North Haven
- Music Lessons - Instrumental, North Haven
- Musical Instrument Rental, North Haven - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, North Haven
- Musical Recording Services, North Haven
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