- Machinery, Supplies & Equipment - Business Production Related, Southbury
- Machinery, Supplies & Equipment - Business Supplies Related, Southbury
- Machinery, Supplies & Equipment - Construction & Contractor Related, Southbury
- Mailbox Rental Services, Southbury
- Mailing, Delivery & Courier Service, Southbury
- Maintenance, Cleaning & Sanitation, Southbury
- Major Appliances, Southbury - Household & Kitchen
- Mammography Clinics, Southbury - Breast Cancer Screening
- Management Consultants & Services, Southbury
- Manicurists & Pedicurists, Southbury
- Manufacturers Agents & Representatives, Southbury
- Manufacturers Representative, Southbury - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Southbury
- Manufacturing Products, Southbury
- Marinas & Marina Services, Southbury
- Marine Products And Services, Southbury
- Marine Services, Southbury
- Marriage & Family Counselors, Southbury
- Martial Arts & Self Defense Schools, Southbury
- Masonry Contractors, Southbury - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Southbury
- Massage Therapists & Professional, Southbury
- Massage Therapy, Southbury
- Mechanical Contractors, Southbury - Install, Service & Repair
- Medical Groups & Clinics, Southbury - Medical & Health Centers
- Medical Supplies & Equipment, Southbury
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- Membership Sports & Recreation Clubs, Southbury
- Men's Clothing Stores, Southbury - Clothes & Accessories
- Mental Health Specialists, Southbury - Psychologist, Psychiatrist, Psychotherapist, etc
- Merle Norman Cosmetics, Southbury
- Metal Stampings Manufacturers, Southbury
- Mildew Removal & Control, Southbury - Mold Removal
- Mini & Self Storage, Southbury
- Miscellaneous Agriculture, Southbury
- Miscellaneous Government, Southbury
- Miscellaneous Manufacturing, Southbury
- Miscellaneous Metal Work Manufacturers, Southbury
- Miscellaneous Personal Services, Southbury
- Miscellaneous Photographers, Southbury
- Miscellaneous Professional, Southbury
- Mobile Communications 2 Way Radios Sales & Service, Southbury
- Modeling & Talent Agencies, Southbury
- Mortgage Bankers & Correspondents, Southbury
- Mortgages & Loans, Southbury
- Motor Vehicle, Southbury
- Moving & Storage Supplies & Equipment, Southbury
- Moving Companies, Southbury
- Mulch, Peat & Moss Products, Southbury
- Museums, Southbury
- Music, Southbury
- Music Lessons, Southbury
- Music Lessons - Instrumental, Southbury
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