- Safety & Security Systems & Consultants, Williston
- Salvage Disposal Service, Williston
- Salvage Yards, Junk Yards & Wrecker Service, Williston
- Sand Gravel & Aggregate, Williston
- Sandwich Shop Restaurants, Williston
- Satellite TV Service, Williston
- Sawmill & Planing Mills, Williston
- Sawmill Supplies & Equipment Repair, Williston
- School - Christian, Williston
- Scrap & Waste Materials, Williston
- Screen Houses, Williston
- Secondary Schools, Williston
- Security & Surveillance System & Equipment, Williston
- Security Consultants, Williston
- Security Services, Williston
- Seeds & Bulbs Wholesale & Growers, Williston
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- Shopping & Shopping Services, Williston
- Signs, Williston
- Small Appliances, Williston
- Snack Foods, Williston
- Social Services & Welfare, Williston
- Sod & Sodding Service, Williston
- Special Interest Schools Or Instruction, Williston
- Specialty Animal Services, Williston
- Specialty Stores, Williston
- Sporting Goods Stores, Williston
- Stationery & Office Supplies, Williston
- Surplus & Salvage Merchandise, Williston
- Surveyor Services, Williston - Surveying Service
- Swimming Pool, Sauna & Spa Contractors, Williston
- Swimming Pools Contractors, Williston - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Williston
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