- Scientific Equipment & Services, Boylston
- Scientific Services, Boylston
- Secondary Schools, Boylston
- Security Alarm Systems - Home & Business, Boylston
- Security Control Systems & Monitoring, Boylston - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Boylston
- Sewer & Drain Cleaning & Repair, Boylston - Drain Cleaner & Installation Services
- Shopping & Shopping Services, Boylston
- Snack Foods, Boylston
- Snow Removal Services, Boylston - Snow Plow Service
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- Social Services & Welfare, Boylston
- Societies & Foundation Associations, Boylston
- Special Coatings, Boylston - Protective Coatings
- Specialty Stores, Boylston
- Sporting Goods Stores, Boylston
- Sprinkler System Contractors, Boylston - Garden & Lawn Sprinkler System Installation & Repair
- Staffing & Support Services, Boylston
- State Government, Boylston
- Stationery & Office Supplies, Boylston
- Surveyor Services, Boylston - Surveying Service
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