- Salvation Army, Dorchester Center
- Sand Gravel & Aggregate, Dorchester Center
- Sandwich Shop Restaurants, Dorchester Center
- School - Catholic, Dorchester Center
- School - Christian, Dorchester Center
- School Bus Transportation, Dorchester Center
- Scientific Equipment & Services, Dorchester Center
- Scientific Services, Dorchester Center
- Seafood Restaurants, Dorchester Center
- Secondary Schools, Dorchester Center
- Senior Citizens Information & Services, Dorchester Center
- Senior Citizens Service & Health Organizations, Dorchester Center
- Sewer & Drain Cleaning & Repair, Dorchester Center - Drain Cleaner & Installation Services
- Sheet Metal, Dorchester Center
- Sheet Metal Contractors, Dorchester Center - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Dorchester Center
- Sheet Metal Work - Aluminum, Tin, Stainless Steel, etc, Dorchester Center - Sheet Metal Products
- Shirts & T-Shirts, Dorchester Center
- Shoe Stores, Dorchester Center - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Dorchester Center
- Skating Rink & Hockey Operation Services, Dorchester Center
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- Small Appliances, Dorchester Center
- Small Business & Office Equipment Repair Services, Dorchester Center
- Snacks & Desserts, Dorchester Center
- Snow Removal Services, Dorchester Center - Snow Plow Service
- Social Clubs & Organizations, Dorchester Center
- Social Services & Welfare, Dorchester Center
- Societies & Foundation Associations, Dorchester Center
- Sound Systems, Microphones & Equipment, Dorchester Center
- Special Events & Party Supply Rental, Dorchester Center
- Special Interest Schools Or Instruction, Dorchester Center
- Special Needs Transportation, Dorchester Center
- Specialty Stores, Dorchester Center
- Sporting Goods Stores, Dorchester Center
- Sportswear Clothing Stores, Dorchester Center - Sports Clothes
- Staffing & Support Services, Dorchester Center
- State Government, Dorchester Center
- Storage Containers, Dorchester Center
- Submarine Sandwich Restaurants, Dorchester Center
- Support Services, Dorchester Center
- Swimming Pool Covers & Enclosures, Dorchester Center
- Swimming Pools Supplies, Equipment & Accessories, Dorchester Center
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