- Sales & Marketing Consultant, Boxford
- Secondary Schools, Boxford
- Security Brokers & Dealers, Boxford
- Security Investigative Services, Boxford
- Security Services, Boxford
- Service Establishment Supplies & Equipment, Boxford
- Sewer & Drain Cleaning & Repair, Boxford - Drain Cleaner & Installation Services
- Shopping & Shopping Services, Boxford
- Silversmiths & Goldsmiths, Boxford
- Silverware & Plated Ware, Boxford
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- Small Appliances, Boxford
- Social Services & Welfare, Boxford
- Sound Systems, Microphones & Equipment, Boxford
- Specialty Animal Services, Boxford
- Specialty Stores, Boxford
- Sporting & Recreational Camps, Boxford
- Sprinkler Alarm Systems, Boxford - Fire Sprinkler Systems
- Staffing & Support Services, Boxford
- Synthetic Resins & Rubber, Boxford
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