- Machine Shop, Hempstead
- Machine Shop & Tool Repair Service, Hempstead
- Machinery And Equipment Manufacturers, Hempstead
- Machinery, Supplies & Equipment - Business Production Related, Hempstead
- Machinery, Supplies & Equipment - Construction & Contractor Related, Hempstead
- Major Appliances, Hempstead - Household & Kitchen
- Management Consultants & Services, Hempstead
- Manicurists & Pedicurists, Hempstead
- Manufacturing, Hempstead
- Manufacturing Products, Hempstead
- Masonry Materials & Supplies, Hempstead
- Meat Market, Wholesale & Products, Hempstead
- Mechanical Contractors, Hempstead - Install, Service & Repair
- Membership Sports & Recreation Clubs, Hempstead
- Mental Health Clinics, Hempstead - Treatment Centers
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- Metal Products, Hempstead
- Metal Repair Service & Blacksmith, Hempstead - Iron Works
- Methodist Church, Hempstead
- Mexican Restaurants, Hempstead
- Ministries Church, Hempstead
- Miscellaneous Government, Hempstead
- Miscellaneous Manufacturing, Hempstead
- Miscellaneous Photographers, Hempstead
- Mobile Home Insurance, Hempstead
- Mobile Home Parks & Communities , Hempstead
- Motor Vehicle, Hempstead
- Motor Vehicle Rental & Leasing, Hempstead
- Movie Theaters, Hempstead
- Moving Companies, Hempstead
- Moving Truck Rental , Hempstead
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