- Safety & Security Systems & Consultants, Somerville
- Sand Gravel & Aggregate, Somerville
- Sandwich Shop Restaurants, Somerville
- Screen Printing, Somerville
- Secondary Schools, Somerville
- Security Consultants, Somerville
- Senior Citizens Service & Health Organizations, Somerville
- Septic Tank Installation & Repair, Somerville - Septic Systems
- Septic Tank Pumping & Cleaning, Somerville - Septic Systems
- Septic Tanks & Septic Systems Contractors, Somerville - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sewer & Drain Cleaning & Repair, Somerville - Drain Cleaner & Installation Services
- Shopping & Shopping Services, Somerville
- Small Appliances, Somerville
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- Soaps & Cosmetics, Somerville
- Social Services & Welfare, Somerville
- Societies & Foundation Associations, Somerville
- Special Needs Transportation, Somerville
- Specialty Stores, Somerville
- State Government, Somerville
- Steel Detailers, Somerville
- Steel Work Contractors, Somerville
- Stone, Somerville
- Store Fixtures, Somerville
- Store Fronts, Somerville - Storefront
- Substance Abuse Clinics, Somerville - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Surveyor Services, Somerville - Surveying Service
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