- Machine Shop & Tool Repair Service, Elmsford
- Machinery And Equipment Manufacturers, Elmsford
- Machinery, Supplies & Equipment - Business Production Related, Elmsford
- Machinery, Supplies & Equipment - Business Supplies Related, Elmsford
- Machinery, Supplies & Equipment - Construction & Contractor Related, Elmsford
- Magazine & Newspaper Stands, Elmsford - Dealers & Distributors
- Mailing List Service, Brokers & Compilers, Elmsford
- Mailing, Delivery & Courier Service, Elmsford
- Maintenance, Cleaning & Sanitation, Elmsford
- Major Appliances, Elmsford - Household & Kitchen
- Management Consultants & Services, Elmsford
- Manicurists & Pedicurists, Elmsford
- Manufacturing, Elmsford
- Manufacturing Equipment & Supplies, Elmsford
- Manufacturing Products, Elmsford
- Marble, Elmsford
- Marble Tiles, Elmsford
- Marinas & Aquariums, Elmsford
- Market Research & Analysis , Elmsford - Market Analysis, Business & Economic Research
- Martial Arts & Self Defense Schools, Elmsford
- Masonry Contractors, Elmsford - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Elmsford
- Massage Therapy, Elmsford
- Material Handling & Heavy Machinery & Equipment, Elmsford
- Mechanical Engineer, Elmsford - Mechanical Engineering Service
- Medical & Dental Management, Elmsford
- Medical Billing Services, Elmsford
- Medical Supplies & Equipment, Elmsford
- Membership Sports & Recreation Clubs, Elmsford
- Mental Health Specialists, Elmsford - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Pricing Equipment, Elmsford
- Metal Repair Service & Blacksmith, Elmsford - Iron Works
- Mexican Restaurants, Elmsford
- Microwave Oven Repair & Service, Elmsford
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- Mildew Removal & Control, Elmsford - Mold Removal
- Mini & Self Storage, Elmsford
- Mirrors, Elmsford - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Elmsford
- Miscellaneous Household Item Repair, Elmsford
- Miscellaneous Business Services, Elmsford
- Miscellaneous Government, Elmsford
- Miscellaneous Personal Services, Elmsford
- Miscellaneous Photographers, Elmsford
- Miscellaneous Professional, Elmsford
- Model Car Racing Centers, Elmsford
- Money Transfer Service, Elmsford
- Mortgage Bankers & Correspondents, Elmsford
- Mortgage Companies, Elmsford
- Mortgages & Loans, Elmsford
- Motion Picture & Television Production Services, Elmsford
- Motor Vehicle, Elmsford
- Motor Vehicle Rental & Leasing, Elmsford
- Motorcycle & Motor Scooters Dealers, Repair & Service, Elmsford
- Motorcycle Parts, Accessories & Dealers, Elmsford
- Motorcycle Repair & Service, Elmsford
- Movie Theaters, Elmsford
- Moving Companies, Elmsford
- Moving Supplies & Equipment Rental, Elmsford
- Moving Truck Rental , Elmsford
- Multi Service Charitable & Non-Profit Organizations, Elmsford
- Multimedia Publishers, Elmsford - Multimedia Services & Systems
- Museums, Elmsford
- Music, Elmsford
- Music Lessons, Elmsford
- Music Lessons - Instrumental, Elmsford
- Music Schools, Elmsford
- Musical Instruments Repair, Sales & Service, Elmsford
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