- Sand Gravel & Aggregate, Stafford Springs
- Sandwich Shop Restaurants, Stafford Springs
- Satellite TV Service, Stafford Springs
- Savings & Loan Associations, Stafford Springs
- Savings Banks, Stafford Springs
- Scientific Equipment & Services, Stafford Springs
- Scientific Services, Stafford Springs
- Scrap & Waste Materials, Stafford Springs
- Screen Printing, Stafford Springs
- Semiconductors & Equipment, Stafford Springs
- Septic Tank Installation & Repair, Stafford Springs - Septic Systems
- Septic Tank Pumping & Cleaning, Stafford Springs - Septic Systems
- Septic Tanks & Septic Systems Contractors, Stafford Springs - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Septic Tanks & Systems, Stafford Springs - Wholesale, Dealers & Suppliers
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- Sheet Metal Contractors, Stafford Springs - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Stafford Springs
- Shopping & Shopping Services, Stafford Springs
- Snacks & Desserts, Stafford Springs
- Social Services & Welfare, Stafford Springs
- Soda Fountain Shops, Stafford Springs
- Special Interest Schools Or Instruction, Stafford Springs
- Specialty Animal Services, Stafford Springs
- Specialty Stores, Stafford Springs
- Sporting Goods Stores, Stafford Springs
- State Government, Stafford Springs
- Stone & Rock Quarry, Stafford Springs - Gravel Pit, Shale, Granite, Limestone, Crushed Rock, etc
- Stone Setting Contractors, Stafford Springs
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