- Machine Shop & Tool Repair Service, Darien
- Machinery, Supplies & Equipment - Business Production Related, Darien
- Machinery, Supplies & Equipment - Construction & Contractor Related, Darien
- Mail Delivery Service, Darien
- Major Appliances, Darien - Household & Kitchen
- Manufacturing, Darien
- Manufacturing Products, Darien
- Marinas & Marina Services, Darien
- Meat Market, Wholesale & Products, Darien
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- Methodist Church, Darien
- Miscellaneous Government, Darien
- Miscellaneous Recreational Facilities, Darien
- Moldings Materials, Darien
- Molds, Darien
- Mortgage Bankers & Correspondents, Darien
- Mortgage Contracts & Services, Darien
- Motor Vehicle, Darien
- Motorcycle Parts, Accessories & Dealers, Darien
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