- Sandwich Shop Restaurants, Williamston
- Savings Banks, Williamston
- Search & Rescue, Williamston
- Secondary Schools, Williamston
- Security & Surveillance System & Equipment, Williamston
- Security Alarm Systems - Home & Business, Williamston
- Security Control Systems & Monitoring, Williamston - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Investigative Services, Williamston
- Security Services, Williamston
- Sewer Cleaning Equipment & Supplies, Williamston - Sewer Builders
- Sheriff's Department, Williamston
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- Shopping & Shopping Services, Williamston
- Signs, Williamston
- Silicones & Silicone Products, Williamston
- Small Appliances, Williamston
- Social Services & Welfare, Williamston
- Specialty Animal Services, Williamston
- Specialty Stores, Williamston
- Stationery & Office Supplies, Williamston
- Surplus & Salvage Merchandise, Williamston
- Surveyor Services, Williamston - Surveying Service
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