- Safety Equipment & Supplies, Millbury
- Sand Spreading Contractors, Millbury
- Sandwich Shop Restaurants, Millbury
- School - Catholic, Millbury
- School - Christian, Millbury
- Scrap & Waste Machinery, Millbury
- Scrap & Waste Materials, Millbury
- Seafood Restaurants, Millbury
- Secondary Schools, Millbury
- Security & Commodity Brokers, Millbury
- Septic Tanks & Septic Systems Contractors, Millbury - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sewer & Drain Cleaning & Repair, Millbury - Drain Cleaner & Installation Services
- Sewing Machines, Equipment & Supplies, Millbury
- Sheet Metal, Millbury
- Shirts & T-Shirts, Millbury
- Shoe Store - More, Millbury
- Shoe Stores, Millbury - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Millbury
- Signs, Millbury
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- Small Appliances, Millbury
- Snacks & Desserts, Millbury
- Snow Removal Services, Millbury - Snow Plow Service
- Social Services & Welfare, Millbury
- Special Events & Party Supply Rental, Millbury
- Special Interest Schools Or Instruction, Millbury
- Specialty Animal Services, Millbury
- Specialty Stores, Millbury
- Sporting Goods Stores, Millbury
- Sportswear Clothing Stores, Millbury - Sports Clothes
- Sprinkler System Contractors, Millbury - Garden & Lawn Sprinkler System Installation & Repair
- Stationery & Office Supplies, Millbury
- Steak House Restaurants, Millbury
- Steel Manufacturers, Millbury
- Steel Mills & Blast Furnaces, Millbury
- Structural Engineer, Millbury
- Swimwear & Accessories Shops, Millbury - Water Sports Equipment
- Synthetic Resins & Rubber, Millbury
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