- Machine Shop & Tool Repair Service, Ridgefield
- Machine Tools , Ridgefield
- Machinery Repair & Rebuild, Ridgefield
- Machinery, Supplies & Equipment - Business Production Related, Ridgefield
- Machinery, Supplies & Equipment - Business Supplies Related, Ridgefield
- Machinery, Supplies & Equipment - Construction & Contractor Related, Ridgefield
- Management Consultants & Services, Ridgefield
- Manufacturing, Ridgefield
- Manufacturing Products, Ridgefield
- Marine Contractors & Designers, Ridgefield
- Masonry Materials & Supplies, Ridgefield
- Meat Cutting Services, Ridgefield
- Meat Market, Wholesale & Products, Ridgefield
- Merchandising & Pricing Equipment, Ridgefield
- Methodist Church, Ridgefield
- Mexican Restaurants, Ridgefield
- Miscellaneous Household Item Repair, Ridgefield
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- Miscellaneous Business Services, Ridgefield
- Miscellaneous Government, Ridgefield
- Miscellaneous Manufacturing, Ridgefield
- Miscellaneous Personal Services, Ridgefield
- Miscellaneous Photographers, Ridgefield
- Miscellaneous Professional, Ridgefield
- Mobile Home Parks & Communities , Ridgefield
- Monuments, Tombstones, Markers & Memorials, Ridgefield
- Motor Vehicle, Ridgefield
- Motor Vehicle Rental & Leasing, Ridgefield
- Moving Companies, Ridgefield
- Moving Truck Rental , Ridgefield
- Multimedia Publishers, Ridgefield - Multimedia Services & Systems
- Music, Ridgefield
- Music Schools, Ridgefield
- Musical Instruments & Equipment Stores, Ridgefield
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