- Machine Shop & Tool Repair Service, Colchester
- Machinery And Equipment Manufacturers, Colchester
- Machinery, Supplies & Equipment - Business Production Related, Colchester
- Machinery, Supplies & Equipment - Construction & Contractor Related, Colchester
- Maintenance, Cleaning & Sanitation, Colchester
- Major Appliances, Colchester - Household & Kitchen
- Management Consultants & Services, Colchester
- Manicurists & Pedicurists, Colchester
- Manifold Business Forms Manufacturers, Colchester
- Manufacturing, Colchester
- Manufacturing Products, Colchester
- Marriage & Family Counselors, Colchester
- Marriage & Family Counselors Information & Referrals, Colchester
- Martial Arts & Self Defense Schools, Colchester
- Masonry Contractors, Colchester - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Colchester
- Massage Therapists & Professional, Colchester
- Massage Therapy, Colchester
- Medical Diagnostic Clinics, Colchester - Clinical Labs & Centers
- Medical Groups & Clinics, Colchester - Medical & Health Centers
- Medical Supplies & Equipment, Colchester
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- Mental Health Specialists, Colchester - Psychologist, Psychiatrist, Psychotherapist, etc
- Mildew Removal & Control, Colchester - Mold Removal
- Mini & Self Storage, Colchester
- Miscellaneous Household Item Repair, Colchester
- Miscellaneous Government, Colchester
- Miscellaneous Personal Services, Colchester
- Miscellaneous Professional, Colchester
- Modular & Mobile Homes For Sale, Colchester - Manufactured Homes Sale & Service
- Molds Manufacturers, Colchester
- Mortgage Bankers & Correspondents, Colchester
- Mortgages Commercial & Industrial, Colchester
- Motor Vehicle, Colchester
- Motor Vehicle Rental & Leasing, Colchester
- Motorcycle Parts, Accessories & Dealers, Colchester
- Movie Theaters, Colchester
- Moving Supplies & Equipment Rental, Colchester
- Moving Truck Rental , Colchester
- Muffler Shop & Exhaust Systems, Colchester
- Music, Colchester
- Musical Instrument Rental, Colchester - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Colchester
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