- Sand Gravel & Aggregate, Hempstead
- Sandwich Shop Restaurants, Hempstead
- Satellite Descrambling & Programming Service, Hempstead
- Satellite Dish Antennas & Equipment Dealers, Hempstead
- Satellite TV Service, Hempstead
- School - Christian, Hempstead
- Schools For The Physically Challenged, Hempstead
- Scientific & Laboratory Equipment & Instruments, Hempstead
- Seafood Restaurants, Hempstead
- Secondary Schools, Hempstead
- Security & Surveillance System & Equipment, Hempstead
- Security Brokers & Dealers, Hempstead
- Security Services, Hempstead
- Septic Tanks & Septic Systems Contractors, Hempstead - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
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- Shopping & Shopping Services, Hempstead
- Social Services & Welfare, Hempstead
- Societies & Foundation Associations, Hempstead
- Special Education & Care, Hempstead
- Specialty Communication Companies & Services, Hempstead
- Specialty Stores, Hempstead
- Spraying Booths & Equipment, Hempstead
- Staffing & Support Services, Hempstead
- State Government, Hempstead
- Steak House Restaurants, Hempstead
- Steel & Metal Goods, Hempstead - Steel Distributors
- Stocks & Bond Brokers, Hempstead
- Surveyor Services, Hempstead - Surveying Service
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