- Machine Shop & Tool Repair Service, Tolland
- Machinery And Equipment Manufacturers, Tolland
- Machinery, Supplies & Equipment - Business Production Related, Tolland
- Machinery, Supplies & Equipment - Business Supplies Related, Tolland
- Mailing, Delivery & Courier Service, Tolland
- Management Consultants & Services, Tolland
- Manicurists & Pedicurists, Tolland
- Manufacturers Agents & Representatives, Tolland
- Manufacturers Representative, Tolland - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Tolland
- Manufacturing Products, Tolland
- Marriage & Family Counselors, Tolland
- Masonry Contractors, Tolland - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Tolland
- Massage Therapy, Tolland
- Medical Diagnostic Clinics, Tolland - Clinical Labs & Centers
- Medical Supplies & Equipment, Tolland
- Membership Sports & Recreation Clubs, Tolland
- Mental Health Specialists, Tolland - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Finishers, Tolland
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- Metal Plating & Polishing, Tolland
- Metal Working Machinery, Tolland
- Microfilm & Imaging Service, Equipment & Supplies , Tolland
- Microfilming & Imaging Service, Tolland
- Millwork Contractors, Tolland
- Mini & Self Storage, Tolland
- Miscellaneous Business Product Repair, Tolland
- Miscellaneous Household Item Repair, Tolland
- Miscellaneous Manufacturing, Tolland
- Miscellaneous Photographers, Tolland
- Miscellaneous Professional, Tolland
- Molds Manufacturers, Tolland
- Monuments, Tombstones, Markers & Memorials, Tolland
- Mortgage Bankers & Correspondents, Tolland
- Motor Vehicle, Tolland
- Motor Vehicle Rental & Leasing, Tolland
- Moving Truck Rental , Tolland
- Museums, Tolland
- Musical Instruments Repair, Sales & Service, Tolland
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