- Machinery, Supplies & Equipment - Business Production Related, Naugatuck
- Machinery, Supplies & Equipment - Business Supplies Related, Naugatuck
- Machinery, Supplies & Equipment - Construction & Contractor Related, Naugatuck
- Magazine & Newspaper Stands, Naugatuck - Dealers & Distributors
- Malpractice Attorneys & Lawyers, Naugatuck
- Malpractice Lawyers & Attorneys, Naugatuck
- Management Consultants & Services, Naugatuck
- Manicurists & Pedicurists, Naugatuck
- Manufacturing, Naugatuck
- Manufacturing Products, Naugatuck
- Manufacturing Services, Naugatuck
- Market Research & Analysis , Naugatuck - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Naugatuck
- Martial Arts & Self Defense Schools, Naugatuck
- Masonry Contractors, Naugatuck - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Naugatuck
- Meat Market, Wholesale & Products, Naugatuck
- Mechanical Contractors, Naugatuck - Install, Service & Repair
- Medical Attorneys & Lawyers, Naugatuck
- Medical Attorneys & Lawyers, Naugatuck
- Medical Groups & Clinics, Naugatuck - Medical & Health Centers
- Medical Lawyers & Attorneys, Naugatuck
- Medical Supplies & Equipment, Naugatuck
- Membership Sports & Recreation Clubs, Naugatuck
- Mental Health Clinics, Naugatuck - Treatment Centers
- Metal Plating & Polishing, Naugatuck
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- Metal Powder Products, Naugatuck
- Metal Repair Service & Blacksmith, Naugatuck - Iron Works
- Metal Stampings Manufacturers, Naugatuck
- Methodist Church, Naugatuck
- Mexican Restaurants, Naugatuck
- Mining, Naugatuck
- Mirrors, Naugatuck - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Fabricated Wire Products Manufacturers, Naugatuck
- Miscellaneous Business Services, Naugatuck
- Miscellaneous Government, Naugatuck
- Miscellaneous Manufacturing, Naugatuck
- Miscellaneous Metal Work Manufacturers, Naugatuck
- Miscellaneous Personal Services, Naugatuck
- Miscellaneous Photographers, Naugatuck
- Miscellaneous Professional, Naugatuck
- Mortgage Bankers & Correspondents, Naugatuck
- Mortgages Commercial & Industrial, Naugatuck
- Motor Vehicle, Naugatuck
- Motor Vehicle Rental & Leasing, Naugatuck
- Movie Theaters, Naugatuck
- Moving Companies, Naugatuck
- Moving Truck Rental , Naugatuck
- Muffler Shop & Exhaust Systems, Naugatuck
- Museums, Naugatuck
- Musical Instruments Repair, Sales & Service, Naugatuck
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