- Machinery, Supplies & Equipment - Business Production Related, Darien
- Machinery, Supplies & Equipment - Construction & Contractor Related, Darien
- Mailing, Delivery & Courier Service, Darien
- Malls & Shopping Centers, Darien
- Management Consultants & Services, Darien
- Manicurists & Pedicurists, Darien
- Manufacturing, Darien
- Marinas & Marina Services, Darien
- Marine Products And Services, Darien
- Marine Repair & Service Stations, Darien
- Marine Supplies & Equipment, Darien - Boat Supplies
- Marine Supplies & Equipment Repair, Darien - Boat Supplies & Equipment
- Masonry Materials & Supplies, Darien
- Massage Therapy, Darien
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- Membership Sports & Recreation Clubs, Darien
- Mental Health Specialists, Darien - Psychologist, Psychiatrist, Psychotherapist, etc
- Merle Norman Cosmetics, Darien
- Methodist Church, Darien
- Mini & Self Storage, Darien
- Miscellaneous Government, Darien
- Miscellaneous Photographers, Darien
- Miscellaneous Professional, Darien
- Motor Vehicle, Darien
- Motor Vehicle Rental & Leasing, Darien
- Moving Supplies & Equipment Rental, Darien
- Moving Truck Rental , Darien
- Muffler Shop & Exhaust Systems, Darien
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