- Sandwich Shop Restaurants, Folsom
- Savings Banks, Folsom
- Scientific & Laboratory Equipment & Instruments, Folsom
- Scrap & Waste Materials, Folsom
- Seafood Restaurants, Folsom
- Secondary Schools, Folsom
- Senior Citizens Service & Health Organizations, Folsom
- Sewer & Drain Cleaning & Repair, Folsom - Drain Cleaner & Installation Services
- Sheet Metal Contractors, Folsom - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Folsom
- Shopping & Shopping Services, Folsom
- Signs, Folsom
- Snacks & Desserts, Folsom
- Snow Removal Services, Folsom - Snow Plow Service
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- Social Services & Welfare, Folsom
- Special Education & Care, Folsom
- Special Interest Schools Or Instruction, Folsom
- Specialty Animal Services, Folsom
- Specialty Stores, Folsom
- Sporting Goods Stores, Folsom
- Springs Automotive, Folsom
- Stairs & Railings Contractors, Folsom - Metal & Wood Stairs, Spiral Staircase & Stair Railing - Installation & Repair
- Stairs, Balcony, Terrace & Steeple Contractors, Folsom
- Stamp Collecting & Coin Dealers , Folsom
- State Government, Folsom
- Stationery & Office Supplies, Folsom
- Steak House Restaurants, Folsom
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