- Machine Shop, Norwich
- Machine Shop & Tool Repair Service, Norwich
- Machinery, Supplies & Equipment - Business Production Related, Norwich
- Machinery, Supplies & Equipment - Business Supplies Related, Norwich
- Machinery, Supplies & Equipment - Construction & Contractor Related, Norwich
- Mailing, Delivery & Courier Service, Norwich
- Maintenance, Cleaning & Sanitation, Norwich
- Major Appliances, Norwich - Household & Kitchen
- Malls & Shopping Centers, Norwich
- Management Consultants & Services, Norwich
- Manicurists & Pedicurists, Norwich
- Manufacturing, Norwich
- Marriage & Family Counselors, Norwich
- Martial Arts & Self Defense Schools, Norwich
- Masonry Contractors, Norwich - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Norwich
- Massage Therapists & Professional, Norwich
- Massage Therapy, Norwich
- Medical Research, Norwich
- Medical Research & Development, Norwich - Medical Information & Research
- Medical Supplies & Equipment, Norwich
- Membership Sports & Recreation Clubs, Norwich
- Mental Health Clinics, Norwich - Treatment Centers
- Mental Health Specialists, Norwich - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Specialties, Norwich
- Metal Working Machinery, Norwich
- Methodist Church, Norwich
- Mildew Removal & Control, Norwich - Mold Removal
- Millwork Contractors, Norwich
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- Mini & Self Storage, Norwich
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Norwich
- Miscellaneous Government, Norwich
- Miscellaneous Manufacturing, Norwich
- Miscellaneous Personal Services, Norwich
- Miscellaneous Professional, Norwich
- Mobile Home Contractors, Norwich
- Mobile Home Improvements & Repairs, Norwich
- Mobile Home Parks & Communities , Norwich
- Modular & Mobile Homes For Sale, Norwich - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Norwich
- Mortgages & Loans, Norwich
- Motion Picture & Television Production Services, Norwich
- Motor Vehicle, Norwich
- Motor Vehicle Rental & Leasing, Norwich
- Motorcycle & Motor Scooters Dealers, Repair & Service, Norwich
- Motorcycle Apparel, Norwich
- Motorcycle Repair & Service, Norwich
- Movie Theaters, Norwich
- Moving Companies, Norwich
- Moving Supplies & Equipment Rental, Norwich
- Moving Truck Rental , Norwich
- Muffler Shop & Exhaust Systems, Norwich
- Museums, Norwich
- Music, Norwich
- Musical Instrument Manufacturers, Norwich
- Musical Instrument Rental, Norwich - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Norwich
- Musical Instruments Repair, Sales & Service, Norwich
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