- Machine Shop & Tool Repair Service, Glastonbury
- Machine Shop Rotary Surface Grinding, Glastonbury - Tool Grinding & Sharpening
- Machinery And Equipment Manufacturers, Glastonbury
- Machinery Custom Design Manufacturers, Glastonbury
- Machinery, Supplies & Equipment - Business Production Related, Glastonbury
- Machinery, Supplies & Equipment - Business Supplies Related, Glastonbury
- Machinery, Supplies & Equipment - Construction & Contractor Related, Glastonbury
- Magazine & Newspaper Stands, Glastonbury - Dealers & Distributors
- Magicians & Hypnotist Entertainers, Glastonbury
- Mailbox Rental Services, Glastonbury
- Mailing, Delivery & Courier Service, Glastonbury
- Management Consultants & Services, Glastonbury
- Manicurists & Pedicurists, Glastonbury
- Manufacturing, Glastonbury
- Manufacturing Products, Glastonbury
- Marinas & Marina Services, Glastonbury
- Marriage & Family Counselors, Glastonbury
- Marriage & Family Counselors Information & Referrals, Glastonbury
- Martial Arts & Self Defense Schools, Glastonbury
- Masonry Contractors, Glastonbury - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Glastonbury
- Massage Therapy, Glastonbury
- Material Handling & Heavy Machinery & Equipment, Glastonbury
- Mausoleum Builders, Glastonbury
- Measuring Equipment, Glastonbury
- Mechanical Contractors, Glastonbury - Install, Service & Repair
- Medical & Health Service Organizations, Glastonbury
- Medical Diagnostic Clinics, Glastonbury - Clinical Labs & Centers
- Medical Supplies & Equipment, Glastonbury
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- Membership Sports & Recreation Clubs, Glastonbury
- Men's Clothing Stores, Glastonbury - Clothes & Accessories
- Mental Health Clinics, Glastonbury - Treatment Centers
- Mental Health Specialists, Glastonbury - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Marketing Consultants, Glastonbury
- Metal Coating & Allied Services, Glastonbury
- Metal Drilling Services, Glastonbury
- Metal Etching, Glastonbury
- Mexican Restaurants, Glastonbury
- Midwives, Glastonbury
- Mini & Self Storage, Glastonbury
- Mining, Glastonbury
- Miscellaneous Household Item Repair, Glastonbury
- Miscellaneous Business Services, Glastonbury
- Miscellaneous Industry, Glastonbury
- Miscellaneous Manufacturing, Glastonbury
- Miscellaneous Personal Services, Glastonbury
- Miscellaneous Photographers, Glastonbury
- Miscellaneous Professional, Glastonbury
- Money Transfer Service, Glastonbury
- Monuments, Tombstones, Markers & Memorials, Glastonbury
- Mortgage Bankers & Correspondents, Glastonbury
- Motion Picture Pre & Post Production Services, Glastonbury
- Motor Sports, Glastonbury
- Motor Vehicle, Glastonbury
- Motor Vehicle Rental & Leasing, Glastonbury
- Moving & Storage Supplies & Equipment, Glastonbury
- Moving Companies, Glastonbury
- Muffler Shop & Exhaust Systems, Glastonbury
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