- Machine Shop & Tool Repair Service, Darien
- Machine Tools , Darien
- Machinery, Supplies & Equipment - Business Production Related, Darien
- Machinery, Supplies & Equipment - Business Supplies Related, Darien
- Magicians & Hypnotist Entertainers, Darien
- Mailing, Delivery & Courier Service, Darien
- Major Appliances, Darien - Household & Kitchen
- Management Consultants & Services, Darien
- Manicurists & Pedicurists, Darien
- Manifold Business Forms Manufacturers, Darien
- Manufacturing, Darien
- Manufacturing Equipment & Supplies, Darien
- Manufacturing Products, Darien
- Market Research & Analysis , Darien - Market Analysis, Business & Economic Research
- Martial Arts & Self Defense Schools, Darien
- Massage Therapy, Darien
- Maytag Appliances, Darien
- Medical & Dental Management, Darien
- Medical & Infectious Waste Disposal, Darien
- Medical Diagnostic Clinics, Darien - Clinical Labs & Centers
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- Medical Supplies & Equipment, Darien
- Mexican Restaurants, Darien
- Mini & Self Storage, Darien
- Miscellaneous Household Item Repair, Darien
- Miscellaneous Government, Darien
- Miscellaneous Manufacturing, Darien
- Miscellaneous Personal Services, Darien
- Miscellaneous Professional, Darien
- Mortgage Bankers & Correspondents, Darien
- Motor Vehicle, Darien
- Motor Vehicle Rental & Leasing, Darien
- Moving Companies, Darien
- Moving Supplies & Equipment Rental, Darien
- Moving Truck Rental , Darien
- Muffler Shop & Exhaust Systems, Darien
- Music, Darien
- Music Lessons, Darien
- Music Lessons - Instrumental, Darien
- Musical Instruments Repair, Sales & Service, Darien
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