- Machine Shop, Stamford
- Machine Shop & Tool Repair Service, Stamford
- Machinery And Equipment Manufacturers, Stamford
- Machinery Custom Design Manufacturers, Stamford
- Machinery Movers & Erectors, Stamford
- Machinery, Supplies & Equipment - Business Production Related, Stamford
- Machinery, Supplies & Equipment - Business Supplies Related, Stamford
- Machinery, Supplies & Equipment - Construction & Contractor Related, Stamford
- Magazine & Newspaper Stands, Stamford - Dealers & Distributors
- Magnetic & Optical Recording Media Manufacturers, Stamford
- Mailbox Rental Services, Stamford
- Mailing, Delivery & Courier Service, Stamford
- Maintenance, Cleaning & Sanitation, Stamford
- Major Appliance Repair & Service, Stamford
- Major Appliances, Stamford - Household & Kitchen
- Make Up & Cosmetics Application, Stamford
- Malls & Shopping Centers, Stamford
- Malpractice Attorneys & Lawyers, Stamford
- Malpractice Lawyers & Attorneys, Stamford
- Mammography Clinics, Stamford - Breast Cancer Screening
- Management Consultants & Services, Stamford
- Management Training & Development, Stamford
- Manicurists & Pedicurists, Stamford
- Manifold Business Forms Manufacturers, Stamford
- Manufacturing, Stamford
- Manufacturing & Industrial Consultants, Stamford
- Manufacturing Equipment & Supplies, Stamford
- Manufacturing Products, Stamford
- Maps Mounting, Stamford
- Marble, Stamford
- Marble Tile, Stamford
- Marinas & Marina Services, Stamford
- Marine Electronic Equipment, Stamford
- Marine Products And Services, Stamford
- Marine Repair & Service Stations, Stamford
- Marine Services, Stamford
- Marine Supplies & Equipment, Stamford - Boat Supplies
- Marine Supplies & Equipment Repair, Stamford - Boat Supplies & Equipment
- Market Research & Analysis , Stamford - Market Analysis, Business & Economic Research
- Marketing Schools, Stamford
- Marriage & Family Counselors, Stamford
- Marriage & Family Counselors Information & Referrals, Stamford
- Marriage Officiant, Stamford
- Martial Arts & Self Defense Schools, Stamford
- Masonry Contractors, Stamford - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Stamford
- Massage Therapists & Professional, Stamford
- Massage Therapy, Stamford
- Material Handling & Heavy Machinery & Equipment, Stamford
- Meat Market, Wholesale & Products, Stamford
- Mechanical Contractors, Stamford - Install, Service & Repair
- Medical & Health Service Organizations, Stamford
- Medical Billing Services, Stamford
- Medical Diagnostic Clinics, Stamford - Clinical Labs & Centers
- Medical Equipment Manufacturers, Stamford
- Medical Groups & Clinics, Stamford - Medical & Health Centers
- Medical Supplies & Equipment, Stamford
- Meeting & Event Planning Services, Stamford - Conference Consultants
- Membership Sports & Recreation Clubs, Stamford
- Men's Clothing Stores, Stamford - Clothes & Accessories
- Mental Health Clinics, Stamford - Treatment Centers
- Mental Health Specialists, Stamford - Psychologist, Psychiatrist, Psychotherapist, etc
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- Merchandising & Marketing Consultants, Stamford
- Messenger Service, Stamford - Message Receiving & Forwarding Service
- Messianic Synagogues, Stamford
- Metal Repair Service & Blacksmith, Stamford - Iron Works
- Metaphysical Churches, Stamford
- Methodist Church, Stamford
- Mexican Food, Stamford
- Mexican Restaurants, Stamford
- Microwave Communications, Stamford
- Microwave Ovens, Stamford
- Middle Eastern Restaurants, Stamford
- Mildew Removal & Control, Stamford - Mold Removal
- Milk Bars, Stamford
- Millwork Contractors, Stamford
- Minerals, Stamford
- Mini & Self Storage, Stamford
- Mining, Stamford
- Ministries Church, Stamford
- Mirrors, Stamford - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Credit Institutions & Services, Stamford
- Miscellaneous Business Product Repair, Stamford
- Miscellaneous Household Item Repair, Stamford
- Miscellaneous Agriculture, Stamford
- Miscellaneous Business Services, Stamford
- Miscellaneous Government, Stamford
- Miscellaneous Manufacturing, Stamford
- Miscellaneous Personal Services, Stamford
- Miscellaneous Photographers, Stamford
- Miscellaneous Professional, Stamford
- Modular & Mobile Homes For Sale, Stamford - Manufactured Homes Sale & Service
- Molds, Stamford
- Money Transfer Service, Stamford
- Monuments, Tombstones, Markers & Memorials, Stamford
- Mortgage Bankers & Correspondents, Stamford
- Mortgage Companies, Stamford
- Mortgage Contracts & Services, Stamford
- Mortgages & Loans, Stamford
- Motion Picture & Television Production Services, Stamford
- Motion Picture Pre & Post Production Services, Stamford
- Motor Vehicle, Stamford
- Motor Vehicle Rental & Leasing, Stamford
- Motorcycle & Motor Scooters Dealers, Repair & Service, Stamford
- Motorcycle Parts, Accessories & Dealers, Stamford
- Motorcycle Repair & Service, Stamford
- Motorcycles Paint & Refinishing, Stamford
- Movie Theaters, Stamford
- Moving & Storage Supplies & Equipment, Stamford
- Moving Companies, Stamford
- Moving Supplies & Equipment Rental, Stamford
- Moving Truck Rental , Stamford
- Muffler Shop & Exhaust Systems, Stamford
- Multimedia Publishers, Stamford - Multimedia Services & Systems
- Museums, Stamford
- Music, Stamford
- Music Entertainment, Stamford
- Music Sheet, Stamford
- Music Stores Retail, Stamford
- Musical Instrument Manufacturers, Stamford
- Musical Instrument Rental, Stamford - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Stamford
- Musical Instruments Repair, Sales & Service, Stamford
- Musical Recording Services, Stamford
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