- Machine Shop, Simsbury
- Machine Shop & Tool Repair Service, Simsbury
- Machinery, Supplies & Equipment - Business Supplies Related, Simsbury
- Mailbox Rental Services, Simsbury
- Mailing, Delivery & Courier Service, Simsbury
- Major Appliances, Simsbury - Household & Kitchen
- Make Up & Cosmetics Application, Simsbury
- Malls & Shopping Centers, Simsbury
- Management Consultants & Services, Simsbury
- Manicurists & Pedicurists, Simsbury
- Manufacturing, Simsbury
- Marriage & Family Counselors, Simsbury
- Martial Arts & Self Defense Schools, Simsbury
- Masonry Contractors, Simsbury - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Simsbury
- Massage Parlor & Steam Bath Services, Simsbury
- Massage Therapists & Professional, Simsbury
- Massage Therapy, Simsbury
- Meat Market, Wholesale & Products, Simsbury
- Medical Diagnostic Clinics, Simsbury - Clinical Labs & Centers
- Medical Groups & Clinics, Simsbury - Medical & Health Centers
- Membership Sports & Recreation Clubs, Simsbury
- Men's Clothing Stores, Simsbury - Clothes & Accessories
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- Mental Health Clinics, Simsbury - Treatment Centers
- Mental Health Specialists, Simsbury - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Buildings, Simsbury - Kits, Homes, Steel Buildings, etc
- Middle Eastern Restaurants, Simsbury
- Mini & Self Storage, Simsbury
- Miscellaneous Business Product Repair, Simsbury
- Miscellaneous Government, Simsbury
- Miscellaneous Manufacturing, Simsbury
- Miscellaneous Personal Services, Simsbury
- Miscellaneous Professional, Simsbury
- Mortgage Bankers & Correspondents, Simsbury
- Motor Vehicle, Simsbury
- Motor Vehicle Rental & Leasing, Simsbury
- Movie Theaters, Simsbury
- Moving & Storage Supplies & Equipment, Simsbury
- Moving Companies, Simsbury
- Moving Truck Rental , Simsbury
- Multimedia Publishers, Simsbury - Multimedia Services & Systems
- Museums, Simsbury
- Music, Simsbury
- Musical Instrument Rental, Simsbury - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Simsbury
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