- Machine Shop, Hartford
- Machine Shop & Tool Repair Service, Hartford
- Machine Tool Repair & Rebuild, Hartford
- Machinery, Supplies & Equipment - Business Production Related, Hartford
- Machinery, Supplies & Equipment - Business Supplies Related, Hartford
- Machinery, Supplies & Equipment - Construction & Contractor Related, Hartford
- Mailing List Service, Brokers & Compilers, Hartford
- Mailing, Delivery & Courier Service, Hartford
- Maintenance, Cleaning & Sanitation, Hartford
- Major Appliance Repair & Service, Hartford
- Major Appliances, Hartford - Household & Kitchen
- Malls & Shopping Centers, Hartford
- Malpractice Attorneys & Lawyers, Hartford
- Malpractice Lawyers & Attorneys, Hartford
- Management Consultants & Services, Hartford
- Manicurists & Pedicurists, Hartford
- Manufacturers Agents & Representatives, Hartford
- Manufacturers Representative, Hartford - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Hartford
- Manufacturing Products, Hartford
- Manufacturing Services, Hartford
- Marble, Hartford
- Marble Contractors, Hartford - Installation, Cleaning & Removal Services
- Marriage & Family Counselors, Hartford
- Martial Arts & Self Defense Schools, Hartford
- Masonry Contractors, Hartford - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Hartford
- Massage Therapists & Professional, Hartford
- Massage Therapy, Hartford
- Material Handling & Heavy Machinery & Equipment, Hartford
- Material Handling Equipment, Hartford - Conveyor Belt, Pallet Jack, Forklift, etc
- Mats & Matting, Hartford
- Meat Market, Wholesale & Products, Hartford
- Mechanical Contractors, Hartford - Install, Service & Repair
- Mechanical Engineer, Hartford - Mechanical Engineering Service
- Medical & Dental Management, Hartford
- Medical & Health Service Organizations, Hartford
- Medical Alert Systems, Hartford - Medical Alarms - PERS
- Medical Diagnostic Clinics, Hartford - Clinical Labs & Centers
- Medical Groups & Clinics, Hartford - Medical & Health Centers
- Medical Supplies & Equipment, Hartford
- Meeting & Event Planning Services, Hartford - Conference Consultants
- Membership Sports & Recreation Clubs, Hartford
- Men's & Boys Clothing & Accessories Stores, Hartford
- Men's Clothing Stores, Hartford - Clothes & Accessories
- Mens & Boys Belts & Suspenders, Hartford
- Mental Health Clinics, Hartford - Treatment Centers
- Mental Health Specialists, Hartford - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Hartford
- Merchandising & Marketing Consultants, Hartford
- Merchandising & Pricing Equipment, Hartford
- Messenger Service, Hartford - Message Receiving & Forwarding Service
- Metal Coating & Allied Services, Hartford
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- Metal Distributors, Hartford
- Metal Lockers, Hartford
- Metal Products, Hartford
- Metal Repair Service & Blacksmith, Hartford - Iron Works
- Methodist Church, Hartford
- Metropolitan Church, Hartford
- Mexican Food, Hartford
- Mexican Restaurants, Hartford
- Microwave Oven Repair & Service, Hartford
- Midwives, Hartford
- Mildew Removal & Control, Hartford - Mold Removal
- Milk Bars, Hartford
- Millwork Contractors, Hartford
- Mini & Self Storage, Hartford
- Mining, Hartford
- Ministries Church, Hartford
- Miscellaneous Household Item Repair, Hartford
- Miscellaneous Agriculture, Hartford
- Miscellaneous Business Services, Hartford
- Miscellaneous Government, Hartford
- Miscellaneous Industry, Hartford
- Miscellaneous Manufacturing, Hartford
- Miscellaneous Personal Services, Hartford
- Miscellaneous Photographers, Hartford
- Miscellaneous Professional, Hartford
- Missing Persons Organizations, Hartford
- Modeling & Talent Agencies, Hartford
- Modular & Mobile Homes For Sale, Hartford - Manufactured Homes Sale & Service
- Money Transfer Service, Hartford
- Monuments, Tombstones, Markers & Memorials, Hartford
- Mortgage Bankers & Correspondents, Hartford
- Mortgage Companies, Hartford
- Mortgages & Loans, Hartford
- Mosques, Hartford
- Motion Picture & Television Production Services, Hartford
- Motion Picture Dists & Producers, Hartford
- Motion Picture Pre & Post Production Services, Hartford
- Motor Vehicle, Hartford
- Motor Vehicle Rental & Leasing, Hartford
- Motorcycle Parts, Accessories & Dealers, Hartford
- Movie Theaters, Hartford
- Moving Companies, Hartford
- Moving Supplies & Equipment Rental, Hartford
- Moving Truck Rental , Hartford
- Muffler Shop & Exhaust Systems, Hartford
- Multimedia Publishers, Hartford - Multimedia Services & Systems
- Museums, Hartford
- Music, Hartford
- Music Entertainment, Hartford
- Music Production Services, Hartford
- Musical Instruments & Equipment Stores, Hartford
- Musical Instruments Repair, Sales & Service, Hartford
- Musical Recording Services, Hartford
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