- Machine Shop & Tool Repair Service, Hempstead
- Machine Tools Manufacturers Metal Cutting Types, Hempstead
- Machinery And Equipment Manufacturers, Hempstead
- Machinery, Supplies & Equipment - Business Production Related, Hempstead
- Machinery, Supplies & Equipment - Business Supplies Related, Hempstead
- Machinery, Supplies & Equipment - Construction & Contractor Related, Hempstead
- Magazine & Newspaper Stands, Hempstead - Dealers & Distributors
- Mailing, Delivery & Courier Service, Hempstead
- Major Appliances, Hempstead - Household & Kitchen
- Malls & Shopping Centers, Hempstead
- Management Consultants & Services, Hempstead
- Management Training & Development, Hempstead
- Manicurists & Pedicurists, Hempstead
- Manifold Business Forms Manufacturers, Hempstead
- Mannequins & Showroom Equipment, Hempstead
- Manufacturing, Hempstead
- Manufacturing Products, Hempstead
- Marketing Consultants Professional Practices, Hempstead
- Marriage & Family Counselors, Hempstead
- Martial Arts & Self Defense Schools, Hempstead
- Masonry Materials & Supplies, Hempstead
- Massage Therapists & Professional, Hempstead
- Massage Therapy, Hempstead
- Meat Market, Wholesale & Products, Hempstead
- Medical & Dental Assistant Schools, Hempstead
- Medical & Dental Management, Hempstead
- Medical Alert Systems, Hempstead - Medical Alarms - PERS
- Medical Diagnostic Clinics, Hempstead - Clinical Labs & Centers
- Medical Examiner, Hempstead - Doctors, Physicians & Surgeons
- Medical Management & Business Administration Service, Hempstead
- Medical Supplies & Equipment, Hempstead
- Membership Sports & Recreation Clubs, Hempstead
- Men's Clothing Stores, Hempstead - Clothes & Accessories
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- Mental Health Clinics, Hempstead - Treatment Centers
- Mental Health Specialists, Hempstead - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Hempstead
- Messenger Service, Hempstead - Message Receiving & Forwarding Service
- Metal Electroforming, Hempstead
- Metal Furniture, Hempstead
- Metal Plating & Polishing, Hempstead
- Metal Products, Hempstead
- Metal Repair Service & Blacksmith, Hempstead - Iron Works
- Methodist Church, Hempstead
- Mexican Restaurants, Hempstead
- Middle Eastern Restaurants, Hempstead
- Mini & Self Storage, Hempstead
- Ministries Church, Hempstead
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Hempstead
- Miscellaneous Government, Hempstead
- Miscellaneous Professional, Hempstead
- Money Transfer Service, Hempstead
- Monuments, Tombstones, Markers & Memorials, Hempstead
- Mortgage Bankers & Correspondents, Hempstead
- Mortgages & Loans, Hempstead
- Motor Vehicle, Hempstead
- Motor Vehicle Rental & Leasing, Hempstead
- Motorcycle & Motor Scooters Dealers, Repair & Service, Hempstead
- Motorcycle Repair & Service, Hempstead
- Moving Companies, Hempstead
- Moving Truck Rental , Hempstead
- Multimedia Publishers, Hempstead - Multimedia Services & Systems
- Museums, Hempstead
- Music, Hempstead
- Musical Instrument Rental, Hempstead - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Hempstead
- Musical Recording Services, Hempstead
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