- Sandwich Shop Restaurants, Whitinsville
- Secondary Schools, Whitinsville
- Security Alarm Systems - Home & Business, Whitinsville
- Security Control Systems & Monitoring, Whitinsville - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Investigative Services, Whitinsville
- Security Services, Whitinsville
- Service Establishment Supplies & Equipment, Whitinsville
- Shopping & Shopping Services, Whitinsville
- Siding Contractors, Whitinsville - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Whitinsville
- Small Appliances, Whitinsville
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- Snacks & Desserts, Whitinsville
- Social Services & Welfare, Whitinsville
- Solar Energy Companies - Contractors, Whitinsville - Solar Panel Installation - Solar Power Systems
- Sound Systems, Microphones & Equipment, Whitinsville
- Specialty Stores, Whitinsville
- Sporting Goods Stores, Whitinsville
- Sports & Recreational Services, Whitinsville
- Sprinkler Alarm Systems, Whitinsville - Fire Sprinkler Systems
- Staffing & Support Services, Whitinsville
- State Government, Whitinsville
- Swimming Pools Supplies, Equipment & Accessories, Whitinsville
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