- Safe & Vault, Somerville
- Safety & Security Systems & Consultants, Somerville
- Sales & Marketing Consultant, Somerville
- Salvation Army, Somerville
- Sandwich Shop Restaurants, Somerville
- Satellite & Cable TV Equipment & Systems, Somerville
- Satellite Communication Downlinking & Uplinking, Somerville
- Satellite TV Service, Somerville
- Savings & Loan Associations, Somerville
- Savings Banks, Somerville
- Scientific & Laboratory Equipment & Instruments, Somerville
- Scientific Services, Somerville
- Scrap & Waste Materials, Somerville
- Screen Printing, Somerville
- Seafood Restaurants, Somerville
- Secondary Schools, Somerville
- Secretarial & Court Reporting Services, Somerville
- Security Alarm Systems - Home & Business, Somerville
- Security Control Systems & Monitoring, Somerville - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Guard & Patrol Service, Somerville - Bodyguard, Guard Dogs, Etc
- Security Management Consultants, Somerville
- Security Services, Somerville
- Senior Citizens Service & Health Organizations, Somerville
- Sewer & Drain Cleaning & Repair, Somerville - Drain Cleaner & Installation Services
- Sewing & Yarn Stores & Supplies, Somerville
- Sewing Machine Repair & Service, Somerville
- Sewing Machines, Equipment & Supplies, Somerville
- Sharpening Service, Somerville
- Shelving Equipment, Somerville
- Shirts & T-Shirts, Somerville
- Shoe Dyers, Somerville
- Shoe Repair Shops, Somerville
- Shoe Stores, Somerville - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Somerville
- Siding Contractors, Somerville - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Somerville
- Skateboards & Equipment Shops, Somerville - Skateboarding Supplies
- Skin Care & Cosmetology Salons, Somerville
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- Skin Care Products & Treatments, Somerville
- Slate, Somerville
- Small Appliances, Somerville
- Snacks & Desserts, Somerville
- Snow Removal Services, Somerville - Snow Plow Service
- Social Clubs & Organizations, Somerville
- Social Service Organizations Educational Information, Somerville
- Social Services & Welfare, Somerville
- Social Workers & Services, Somerville
- Societies & Foundation Associations, Somerville
- South American Restaurants, Somerville
- Special Events & Party Supply Rental, Somerville
- Special Interest Schools Or Instruction, Somerville
- Specialty Stores, Somerville
- Speech & Hearing Specialists, Somerville
- Sporting Goods Stores, Somerville
- Sports Bars & Lounges, Somerville
- Sports Clubs, Somerville
- Sportswear Clothing Stores, Somerville - Sports Clothes
- Staffing & Support Services, Somerville
- State Government, Somerville
- Stationery & Office Supplies, Somerville
- Steel & Metal Goods, Somerville - Steel Distributors
- Steel Manufacturers, Somerville
- Stereo, Audio & Video Equipment Dealers & Stores, Somerville
- Storage & Closet Equipment Supplies & Materials, Somerville
- Store Fixtures & Display Equipment, Somerville
- Store Fronts, Somerville - Storefront
- Storm Doors & Windows, Somerville
- Structural Engineer, Somerville
- Substance Abuse Clinics, Somerville - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Suicide Prevention Service & Counseling, Somerville
- Surfboard & Windsurfing Equipment Shops, Somerville
- Surveyor Services, Somerville - Surveying Service
- Sushi Restaurants, Somerville
- Swimming Pool Covers & Enclosures, Somerville
- Swimming Pools Supplies, Equipment & Accessories, Somerville
- Synagogues & Temples, Somerville
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