- Safety & Security Systems & Consultants, Williston
- Safety Equipment & Supplies, Williston
- Salvage Yards, Junk Yards & Wrecker Service, Williston
- Salvation Army, Williston
- Sand Gravel & Aggregate, Williston
- Sandblasting, Williston - General Contractors
- Sandwich Shop Restaurants, Williston
- Satellite TV Service, Williston
- Savings & Loan Associations, Williston
- Savings Banks, Williston
- School - Christian, Williston
- Scrap & Waste Materials, Williston
- Screen Printing, Williston
- Screens Doors & Windows, Williston
- Seafood Restaurants, Williston
- Secondary Schools, Williston
- Secretarial & Court Reporting Services, Williston
- Security & Surveillance System & Equipment, Williston
- Security Alarm Systems - Home & Business, Williston
- Security Brokers & Dealers, Williston
- Security Consultants, Williston
- Security Control Systems & Monitoring, Williston - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Guard & Patrol Service, Williston - Bodyguard, Guard Dogs, Etc
- Security Services, Williston
- Seed & Grain Cleaning, Williston
- Senior Citizens Information & Services, Williston
- Senior Citizens Service & Health Organizations, Williston
- Septic Tank Installation & Repair, Williston - Septic Systems
- Septic Tank Pumping & Cleaning, Williston - Septic Systems
- Septic Tanks & Septic Systems Contractors, Williston - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Septic Tanks & Systems Contractors & Designers, Williston
- Service Establishment Supplies & Equipment, Williston
- Sewer & Drain Cleaning & Repair, Williston - Drain Cleaner & Installation Services
- Sewing Machine Repair & Service, Williston
- Sharpening Service, Williston
- Sheriff's Department, Williston
- Sherwin Williams Paint, Williston
- Shipping Service, Williston
- Shoe Dyers, Williston
- Shoe Repair Shops, Williston
- Shoe Stores, Williston - Mens, Womens & Kids Shoes
- Shooting & Target Ranges, Williston
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- Shopping & Shopping Services, Williston
- Siding Contractors, Williston - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Siding Materials, Williston
- Signs, Williston
- Skating Rink & Hockey Operation Services, Williston
- Small Appliances, Williston
- Smelters & Refiners Precious Metals, Williston
- Snacks & Desserts, Williston
- Snowmobile Dealers, Williston - Parts, Gear, Clothing & Accessories
- Social Clubs & Organizations, Williston
- Social Services & Welfare, Williston
- Societies & Foundation Associations, Williston
- Soil Preparation Services, Williston
- Soil Services, Williston
- Solar Products & Services, Williston
- Special Education & Care, Williston
- Special Events Photographers, Williston
- Special Interest Schools Or Instruction, Williston
- Specialty Communication Companies & Services, Williston
- Specialty Rental Services, Williston
- Specialty Stores, Williston
- Speech & Hearing Specialists, Williston
- Sporting Goods Stores, Williston
- Staffing & Support Services, Williston
- State Government, Williston
- Steak House Restaurants, Williston
- Steel & Metal Goods, Williston - Steel Distributors
- Steel Manufacturers, Williston
- Stereo, Audio & Video Equipment Dealers & Stores, Williston
- Stock & Bond Brokers & Dealers, Williston
- Stocks & Bond Brokers, Williston
- Stone Setting Contractors, Williston
- Stoves & Furnace Equipment, Williston - Fittings & Repair Parts
- Structural Engineer, Williston
- Substance Abuse Clinics, Williston - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Surgical Hospitals, Williston - Surgical Centers
- Surplus & Salvage Merchandise, Williston
- Surveyor Services, Williston - Surveying Service
- Surveyors, Williston
- Swimming Pool, Sauna & Spa Contractors, Williston
- Swimming Pools, Williston
- Swimming Pools Contractors, Williston - Install Inground - Above Ground Pools
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