- Machine Shop & Tool Repair Service, South Windsor
- Machine Tools , South Windsor
- Machinery And Equipment Manufacturers, South Windsor
- Machinery, Supplies & Equipment - Business Production Related, South Windsor
- Machinery, Supplies & Equipment - Business Supplies Related, South Windsor
- Machinery, Supplies & Equipment - Construction & Contractor Related, South Windsor
- Mailing, Delivery & Courier Service, South Windsor
- Make Up & Cosmetics Application, South Windsor
- Malls & Shopping Centers, South Windsor
- Management Consultants & Services, South Windsor
- Manicurists & Pedicurists, South Windsor
- Manufacturers Agents & Representatives, South Windsor
- Manufacturers Representative, South Windsor - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, South Windsor
- Manufacturing Products, South Windsor
- Marble & Terrazzo Flooring - Cleaning & Service, South Windsor
- Marine Pilot & Operator Service, South Windsor
- Marine Products And Services, South Windsor
- Marine Repair & Service Stations, South Windsor
- Marine Supplies & Equipment, South Windsor - Boat Supplies
- Marine Supplies & Equipment Repair, South Windsor - Boat Supplies & Equipment
- Marriage & Family Counselors, South Windsor
- Martial Arts & Self Defense Schools, South Windsor
- Masking & Shipping Tapes, South Windsor
- Masonry Contractors, South Windsor - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, South Windsor
- Massage Therapists & Professional, South Windsor
- Massage Therapy, South Windsor
- Maternity Clothes & Clothing Stores, South Windsor - Maternity Dress, Gown, Swimwear, Underwear & More
- Meat Market, Wholesale & Products, South Windsor
- Mechanical Contractors, South Windsor - Install, Service & Repair
- Mechanical Engineer, South Windsor - Mechanical Engineering Service
- Medical & Dental Management, South Windsor
- Medical & Health Service Organizations, South Windsor
- Medical Diagnostic Clinics, South Windsor - Clinical Labs & Centers
- Medical Equipment Manufacturers, South Windsor
- Medical Research, South Windsor
- Medical Research & Development, South Windsor - Medical Information & Research
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- Medical Supplies & Equipment, South Windsor
- Membership Sports & Recreation Clubs, South Windsor
- Men's Clothing Stores, South Windsor - Clothes & Accessories
- Mental Health Specialists, South Windsor - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Coating & Allied Services, South Windsor
- Metal Deburring, South Windsor
- Metal Finishers, South Windsor
- Metal Heat Treating, South Windsor
- Metal Plating & Polishing, South Windsor
- Metal Repair Service & Blacksmith, South Windsor - Iron Works
- Metal Stampings Manufacturers, South Windsor
- Metal Working Machinery, South Windsor
- Mexican Restaurants, South Windsor
- Millwork Manufacturers, South Windsor
- Minerals, South Windsor
- Mini & Self Storage, South Windsor
- Mini Golf Courses, South Windsor
- Miscellaneous Agriculture, South Windsor
- Miscellaneous Business Services, South Windsor
- Miscellaneous Government, South Windsor
- Miscellaneous Industry, South Windsor
- Miscellaneous Manufacturing, South Windsor
- Miscellaneous Metal Work Manufacturers, South Windsor
- Miscellaneous Personal Services, South Windsor
- Miscellaneous Photographers, South Windsor
- Miscellaneous Professional, South Windsor
- Mobile Home Parks & Communities , South Windsor
- Monuments, Tombstones, Markers & Memorials, South Windsor
- Mortgage Bankers & Correspondents, South Windsor
- Motor Vehicle, South Windsor
- Motor Vehicle Rental & Leasing, South Windsor
- Motorcycle Parts, Accessories & Dealers, South Windsor
- Moving Companies, South Windsor
- Moving Services - Labor & Material, South Windsor
- Moving Supplies & Equipment Rental, South Windsor
- Moving Truck Rental , South Windsor
- Mowing Service, South Windsor
- Musical Instruments Repair, Sales & Service, South Windsor
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