- Secondary Schools, Williston Park
- Secretarial & Court Reporting Services, Williston Park
- Security & Surveillance System & Equipment, Williston Park
- Security Alarm Systems - Home & Business, Williston Park
- Security Control Systems & Monitoring, Williston Park - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Investigative Services, Williston Park
- Security Services, Williston Park
- Sewer & Drain Cleaning & Repair, Williston Park - Drain Cleaner & Installation Services
- Shoe Repair Shops, Williston Park
- Shoe Store - More, Williston Park
- Shoe Stores, Williston Park - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Williston Park
- Siding Contractors, Williston Park - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Williston Park
- Small Appliances, Williston Park
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- Snacks & Desserts, Williston Park
- Social & Human Services Autism Services, Williston Park
- Social Services & Welfare, Williston Park
- Special Events & Party Supply Rental, Williston Park
- Special Events Photographers, Williston Park
- Special Interest Schools Or Instruction, Williston Park
- Specialty Stores, Williston Park
- Speech & Hearing Specialists, Williston Park
- Speech & Language Therapy, Williston Park
- Speech Pathologists, Williston Park - Speech & Language Therapy
- Stationery & Office Supplies, Williston Park
- Stationery Manufacturers, Williston Park
- Stone And Glass Products, Williston Park
- Sushi Restaurants, Williston Park
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