- Machine Shop, Danbury
- Machine Shop & Tool Repair Service, Danbury
- Machinery, Supplies & Equipment - Business Production Related, Danbury
- Machinery, Supplies & Equipment - Business Supplies Related, Danbury
- Machinery, Supplies & Equipment - Construction & Contractor Related, Danbury
- Magazine & Newspaper Stands, Danbury - Dealers & Distributors
- Mailbox Rental Services, Danbury
- Mailboxes Retail, Danbury
- Mailing, Delivery & Courier Service, Danbury
- Maintenance, Cleaning & Sanitation, Danbury
- Major Appliances, Danbury - Household & Kitchen
- Malls & Shopping Centers, Danbury
- Malpractice Attorneys & Lawyers, Danbury
- Malpractice Attorneys & Lawyers, Danbury
- Malpractice Lawyers & Attorneys, Danbury
- Management Consultants & Services, Danbury
- Manicurists & Pedicurists, Danbury
- Manufacturers Agents & Representatives, Danbury
- Manufacturers Representative, Danbury - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Danbury
- Manufacturing Equipment & Supplies, Danbury
- Manufacturing Products, Danbury
- Manufacturing Services, Danbury
- Marble, Danbury
- Marble Contractors, Danbury - Installation, Cleaning & Removal Services
- Marinas & Marina Services, Danbury
- Marine Products And Services, Danbury
- Marine Services, Danbury
- Market Research & Analysis , Danbury - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Danbury
- Marriage & Family Counselors Information & Referrals, Danbury
- Martial Arts & Self Defense Schools, Danbury
- Masonry Contractors, Danbury - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Danbury
- Massage Therapists & Professional, Danbury
- Massage Therapy, Danbury
- Material Handling Equipment, Danbury - Conveyor Belt, Pallet Jack, Forklift, etc
- Maternity Clothes & Clothing Stores, Danbury - Maternity Dress, Gown, Swimwear, Underwear & More
- Mausoleums Developers, Danbury
- Meals Ready To Eat Manufacturers, Danbury
- Measuring Equipment, Danbury
- Meat Market, Wholesale & Products, Danbury
- Mechanical Contractors, Danbury - Install, Service & Repair
- Mechanical Engineer, Danbury - Mechanical Engineering Service
- Medical & Health Service Organizations, Danbury
- Medical Billing Services, Danbury
- Medical Diagnostic Clinics, Danbury - Clinical Labs & Centers
- Medical Diagnostic Imaging, Danbury
- Medical Equipment Manufacturers, Danbury
- Medical Groups & Clinics, Danbury - Medical & Health Centers
- Medical Supplies & Equipment, Danbury
- Meeting & Event Planning Services, Danbury - Conference Consultants
- Melkite Church, Danbury
- Membership Sports & Recreation Clubs, Danbury
- Men's Clothing Stores, Danbury - Clothes & Accessories
- Men's Shoe Stores, Danbury
- Mental Health Clinics, Danbury - Treatment Centers
- Mental Health Specialists, Danbury - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Marketing Consultants, Danbury
- Metal Buildings, Danbury - Kits, Homes, Steel Buildings, etc
- Metal Detecting Equipment, Danbury
- Metal Electroforming, Danbury
- Metal Finishers, Danbury
- Metal Plating & Polishing, Danbury
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- Metal Powder Products, Danbury
- Metal Repair Service & Blacksmith, Danbury - Iron Works
- Metal Specialties, Danbury
- Metal Stampings Manufacturers, Danbury
- Metal Working Machinery, Danbury
- Metaphysical Churches, Danbury
- Methodist Church, Danbury
- Mexican Restaurants, Danbury
- Microfilming & Imaging Service, Danbury
- Middle Eastern Restaurants, Danbury
- Midwives, Danbury
- Mildew Removal & Control, Danbury - Mold Removal
- Milk & Milk Products, Danbury
- Minerals, Danbury
- Mini & Self Storage, Danbury
- Mining, Danbury
- Ministries Church, Danbury
- Miscellaneous Business Product Repair, Danbury
- Miscellaneous Agriculture, Danbury
- Miscellaneous Business Services, Danbury
- Miscellaneous Government, Danbury
- Miscellaneous Industry, Danbury
- Miscellaneous Manufacturing, Danbury
- Miscellaneous Metal Work Manufacturers, Danbury
- Miscellaneous Personal Services, Danbury
- Miscellaneous Photographers, Danbury
- Miscellaneous Professional, Danbury
- Mobile Home Parks & Communities , Danbury
- Model Trains, Danbury
- Money Counting & Wrapping, Danbury
- Money Transfer Service, Danbury
- Monuments, Tombstones, Markers & Memorials, Danbury
- Mortgage Bankers & Correspondents, Danbury
- Mortgage Companies, Danbury
- Mortgages & Loans, Danbury
- Motion Picture & Television Production Services, Danbury
- Motion Picture Dists & Producers, Danbury
- Motion Picture Pre & Post Production Services, Danbury
- Motion Picture Special Effects, Danbury
- Motor Vehicle, Danbury
- Motor Vehicle Rental & Leasing, Danbury
- Motorcycle & Motor Scooters Dealers, Repair & Service, Danbury
- Motorcycle Parts, Accessories & Dealers, Danbury
- Motorcycle Repair & Service, Danbury
- Movie Theaters, Danbury
- Moving & Storage Supplies & Equipment, Danbury
- Moving Companies, Danbury
- Moving Supplies & Equipment Rental, Danbury
- Moving Truck Rental , Danbury
- Muffler Shop & Exhaust Systems, Danbury
- Mulch, Peat & Moss Products, Danbury
- Museums, Danbury
- Music, Danbury
- Music Entertainment, Danbury
- Music Lessons, Danbury
- Music Lessons - Instrumental, Danbury
- Music Lessons - Vocal, Danbury
- Musical Instrument Rental, Danbury - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Danbury
- Musical Instruments - Guitars, Danbury
- Musical Instruments Repair, Sales & Service, Danbury
- Musical Recording Services, Danbury
- Muslim Church, Danbury
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