- Machine Shop & Tool Repair Service, Westbury
- Machine Tools Manufacturers Metal Cutting Types, Westbury
- Machinery And Equipment Manufacturers, Westbury
- Machinery Movers & Erectors, Westbury
- Machinery, Supplies & Equipment - Business Production Related, Westbury
- Machinery, Supplies & Equipment - Business Supplies Related, Westbury
- Machinery, Supplies & Equipment - Construction & Contractor Related, Westbury
- Magazine & Newspaper Stands, Westbury - Dealers & Distributors
- Magicians & Hypnotist Entertainers, Westbury
- Mail Delivery Service, Westbury
- Mailing, Delivery & Courier Service, Westbury
- Major Appliance Repair & Service, Westbury
- Major Appliances, Westbury - Household & Kitchen
- Malls & Shopping Centers, Westbury
- Management Consultants & Services, Westbury
- Manicurists & Pedicurists, Westbury
- Manufacturers Agents & Representatives, Westbury
- Manufacturers Representative, Westbury - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Westbury
- Manufacturing & Industrial Consultants, Westbury
- Manufacturing Products, Westbury
- Marble, Westbury
- Marble & Terrazzo Flooring - Cleaning & Service, Westbury
- Marble Contractors, Westbury - Installation, Cleaning & Removal Services
- Marble Tiles, Westbury
- Marketing Consultants Professional Practices, Westbury
- Marriage & Family Counselors, Westbury
- Martial Arts & Self Defense Schools, Westbury
- Masonry Contractors, Westbury - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Westbury
- Massage Therapists & Professional, Westbury
- Massage Therapy, Westbury
- Mattress & Bedspring Manufacturers, Westbury
- Mausoleum Builders, Westbury
- Mausoleums Developers, Westbury
- Meat Market, Wholesale & Products, Westbury
- Mechanical Contractors, Westbury - Install, Service & Repair
- Medical & Dental Management, Westbury
- Medical & Health Service Organizations, Westbury
- Medical Billing Services, Westbury
- Medical Diagnostic Clinics, Westbury - Clinical Labs & Centers
- Medical Groups & Clinics, Westbury - Medical & Health Centers
- Medical Records Service , Westbury
- Medical Supplies & Equipment, Westbury
- Mediterranean Restaurants, Westbury
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- Men's Clothing Stores, Westbury - Clothes & Accessories
- Mental & Developmental Information & Referral Services, Westbury
- Mental Health Specialists, Westbury - Psychologist, Psychiatrist, Psychotherapist, etc
- Messenger Service, Westbury - Message Receiving & Forwarding Service
- Metal Distributors, Westbury
- Metal Products, Westbury
- Metal Repair Service & Blacksmith, Westbury - Iron Works
- Metal Specialties, Westbury
- Methodist Church, Westbury
- Mexican Restaurants, Westbury
- Middle Eastern Restaurants, Westbury
- Mining, Westbury
- Mirrors, Westbury - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Westbury
- Miscellaneous Prosthesis & Appliances, Westbury
- Miscellaneous Agriculture, Westbury
- Miscellaneous Business Services, Westbury
- Miscellaneous Government, Westbury
- Miscellaneous Manufacturing, Westbury
- Miscellaneous Personal Services, Westbury
- Miscellaneous Photographers, Westbury
- Miscellaneous Professional, Westbury
- Moldings Materials, Westbury
- Money Transfer Service, Westbury
- Monuments, Tombstones, Markers & Memorials, Westbury
- Mortgage Bankers & Correspondents, Westbury
- Motion Picture & Television Production Services, Westbury
- Motion Picture Dists & Producers, Westbury
- Motion Picture Pre & Post Production Services, Westbury
- Motivational Speakers & Consultants, Westbury - Speakers, Lectures & Seminars
- Motor Vehicle, Westbury
- Motor Vehicle Rental & Leasing, Westbury
- Movie Theaters, Westbury
- Moving Companies, Westbury
- Muffler Shop & Exhaust Systems, Westbury
- Mulch, Peat & Moss Products, Westbury
- Museums, Westbury
- Music, Westbury
- Music Lessons, Westbury
- Music Lessons - Instrumental, Westbury
- Music Lessons - Vocal, Westbury
- Music Schools, Westbury
- Musical Instrument Rental, Westbury - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Westbury
- Musical Instruments Repair, Sales & Service, Westbury
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