- Machine Shop & Tool Repair Service, New Britain
- Machine Shop Rotary Surface Grinding, New Britain - Tool Grinding & Sharpening
- Machinery And Equipment Manufacturers, New Britain
- Machinery, Supplies & Equipment - Business Production Related, New Britain
- Machinery, Supplies & Equipment - Business Supplies Related, New Britain
- Machinery, Supplies & Equipment - Construction & Contractor Related, New Britain
- Mailing, Delivery & Courier Service, New Britain
- Major Appliances, New Britain - Household & Kitchen
- Malpractice Attorneys & Lawyers, New Britain
- Malpractice Attorneys & Lawyers, New Britain
- Malpractice Lawyers & Attorneys, New Britain
- Management Consultants & Services, New Britain
- Manicurists & Pedicurists, New Britain
- Manufacturers Agents & Representatives, New Britain
- Manufacturers Representative, New Britain - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, New Britain
- Manufacturing & Industrial Consultants, New Britain
- Manufacturing Products, New Britain
- Marriage & Family Counselors, New Britain
- Martial Arts & Self Defense Schools, New Britain
- Masonry Contractors, New Britain - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, New Britain
- Massage Parlor & Steam Bath Services, New Britain
- Massage Therapy, New Britain
- Meat Market, Wholesale & Products, New Britain
- Meat Packers, New Britain
- Mechanical Engineer, New Britain - Mechanical Engineering Service
- Medical Groups & Clinics, New Britain - Medical & Health Centers
- Medical Supplies & Equipment, New Britain
- Membership Sports & Recreation Clubs, New Britain
- Men's Clothing Stores, New Britain - Clothes & Accessories
- Mental Health Clinics, New Britain - Treatment Centers
- Mental Health Specialists, New Britain - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Pricing Equipment, New Britain
- Messenger Service, New Britain - Message Receiving & Forwarding Service
- Metal Coating & Allied Services, New Britain
- Metal Cutting Services, New Britain
- Metal Deburring, New Britain
- Metal Finishers, New Britain
- Metal Heat Treating, New Britain
- Metal Plating & Polishing, New Britain
- Metal Repair Service & Blacksmith, New Britain - Iron Works
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- Metal Working Machinery, New Britain
- Metallurgical Testing Labs, New Britain
- Mexican Restaurants, New Britain
- Microfilming & Imaging Service, New Britain
- Mini & Self Storage, New Britain
- Ministries Church, New Britain
- Miscellaneous Business Product Repair, New Britain
- Miscellaneous Household Item Repair, New Britain
- Miscellaneous Business Services, New Britain
- Miscellaneous Government, New Britain
- Miscellaneous Industry, New Britain
- Miscellaneous Manufacturing, New Britain
- Miscellaneous Personal Services, New Britain
- Miscellaneous Photographers, New Britain
- Miscellaneous Professional, New Britain
- Money Transfer Service, New Britain
- Monuments, Tombstones, Markers & Memorials, New Britain
- Mortgage Bankers & Correspondents, New Britain
- Mortgages & Loans, New Britain
- Motion Picture Pre & Post Production Services, New Britain
- Motor Vehicle, New Britain
- Motor Vehicle Rental & Leasing, New Britain
- Motorcycle & Motor Scooters Dealers, Repair & Service, New Britain
- Motorcycle Parts, Accessories & Dealers, New Britain
- Motorcycle Repair & Service, New Britain
- Movie Theaters, New Britain
- Moving Companies, New Britain
- Moving Services - Labor & Material, New Britain
- Moving Supplies & Equipment Rental, New Britain
- Moving Truck Rental , New Britain
- Muffler Shop & Exhaust Systems, New Britain
- Mulch, Peat & Moss Products, New Britain
- Museums, New Britain
- Music, New Britain
- Music Entertainment, New Britain
- Music Lessons, New Britain
- Music Lessons - Instrumental, New Britain
- Music Production Services, New Britain
- Musical Instrument Rental, New Britain - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, New Britain
- Musical Instruments Repair, Sales & Service, New Britain
- Musical Recording Services, New Britain
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