- Safety & Security Systems & Consultants, West Hempstead
- Safety Equipment & Supplies, West Hempstead
- Scientific Equipment & Services, West Hempstead
- Scientific Services, West Hempstead
- Scrap & Waste Machinery, West Hempstead
- Scrap & Waste Materials, West Hempstead
- Screen Printing, West Hempstead
- Secondary Schools, West Hempstead
- Secretarial & Court Reporting Services, West Hempstead
- Security & Surveillance System & Equipment, West Hempstead
- Security Alarm Systems - Home & Business, West Hempstead
- Security Brokers & Dealers, West Hempstead
- Security Control Systems & Monitoring, West Hempstead - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Management Consultants, West Hempstead
- Security Services, West Hempstead
- Self Defense Programs, West Hempstead
- Senior Citizens Service & Health Organizations, West Hempstead
- Sewer & Drain Cleaning & Repair, West Hempstead - Drain Cleaner & Installation Services
- Sewing Machines, Equipment & Supplies, West Hempstead
- Sheet Metal Fabricators & Ductwork Contractors, West Hempstead
- Shoe Repair Shops, West Hempstead
- Shoe Stores, West Hempstead - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, West Hempstead
- Siding Contractors, West Hempstead - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, West Hempstead
- Sleep Doctors, West Hempstead - Specialists, Physicians & Surgeons (Sleep Medicine)
- Slip Covers, West Hempstead - Ready & Custom Made
- Small Appliances, West Hempstead
- Snacks & Desserts, West Hempstead
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- Snow Removal Services, West Hempstead - Snow Plow Service
- Social Services & Welfare, West Hempstead
- Social Workers & Services, West Hempstead
- Sound Systems & Recording Equipment, West Hempstead
- South American Restaurants, West Hempstead
- Special Events & Party Supply Rental, West Hempstead
- Special Interest Schools Or Instruction, West Hempstead
- Specialty Animal Services, West Hempstead
- Specialty Stores, West Hempstead
- Sporting & Recreational Camps, West Hempstead
- Sporting Goods Stores, West Hempstead
- Sports Bars & Lounges, West Hempstead
- Sports Clubs, West Hempstead
- Sportswear Manufacturers, West Hempstead
- Sportswear Wholesale, West Hempstead
- Sprinkler System Contractors, West Hempstead - Garden & Lawn Sprinkler System Installation & Repair
- Staffing & Support Services, West Hempstead
- State Government, West Hempstead
- Steel & Metal Goods, West Hempstead - Steel Distributors
- Stocks & Bond Brokers, West Hempstead
- Store Fixtures & Display Equipment, West Hempstead
- Stove, Oven, Range & Cooktop Parts & Supplies, West Hempstead
- Stucco Stone, West Hempstead
- Substance Abuse Clinics, West Hempstead - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Surgical Supplies & Equipment, West Hempstead
- Surgical Supplies, Instruments, Tools & Equipment, West Hempstead
- Sushi Restaurants, West Hempstead
- Synagogues & Temples, West Hempstead
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