- Machine Shop & Tool Repair Service, Darien
- Machinery, Supplies & Equipment - Business Production Related, Darien
- Machinery, Supplies & Equipment - Business Supplies Related, Darien
- Machinery, Supplies & Equipment - Construction & Contractor Related, Darien
- Mailbox Rental Services, Darien
- Mailing List Service, Brokers & Compilers, Darien
- Mailing, Delivery & Courier Service, Darien
- Major Appliances, Darien - Household & Kitchen
- Management Consultants & Services, Darien
- Manicurists & Pedicurists, Darien
- Manufacturing, Darien
- Manufacturing Products, Darien
- Marble, Darien
- Marinas & Marina Services, Darien
- Marine Products And Services, Darien
- Marine Services, Darien
- Marriage & Family Counselors, Darien
- Martial Arts & Self Defense Schools, Darien
- Masonry Contractors, Darien - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Darien
- Mausoleums Developers, Darien
- Medical & Health Service Organizations, Darien
- Medical Diagnostic Clinics, Darien - Clinical Labs & Centers
- Meeting & Event Planning Services, Darien - Conference Consultants
- Membership Sports & Recreation Clubs, Darien
- Men's Clothing Stores, Darien - Clothes & Accessories
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- Mental Health Clinics, Darien - Treatment Centers
- Mental Health Specialists, Darien - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Marketing Consultants, Darien
- Messenger Service, Darien - Message Receiving & Forwarding Service
- Methodist Church, Darien
- Mexican Food, Darien
- Mexican Restaurants, Darien
- Middle Eastern Restaurants, Darien
- Mining, Darien
- Miscellaneous Business Services, Darien
- Miscellaneous Government, Darien
- Miscellaneous Personal Services, Darien
- Miscellaneous Photographers, Darien
- Miscellaneous Professional, Darien
- Monuments, Tombstones, Markers & Memorials, Darien
- Mortgage Bankers & Correspondents, Darien
- Mortgage Companies, Darien
- Mortgages & Loans, Darien
- Motor Vehicle, Darien
- Motor Vehicle Rental & Leasing, Darien
- Movie Theaters, Darien
- Moving & Storage Supplies & Equipment, Darien
- Museums, Darien
- Music, Darien
- Music Lessons, Darien
- Music Lessons - Instrumental, Darien
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