- Sandwich Shop Restaurants, East Alton
- Scrap & Waste Machinery, East Alton
- Scrap & Waste Materials, East Alton
- Sculptures Retail, East Alton
- Security Services, East Alton
- Seeds & Bulbs Wholesale & Growers, East Alton
- Sewer & Drain Cleaning & Repair, East Alton - Drain Cleaner & Installation Services
- Shoe Store - More, East Alton
- Shopping & Shopping Services, East Alton
- Shopping Services, East Alton
- Siding Contractors, East Alton - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, East Alton
- Skating Rink & Hockey Operation Services, East Alton
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- Social Services & Welfare, East Alton
- Societies & Foundation Associations, East Alton
- Soup & Salad Restaurants, East Alton
- Specialty Stores, East Alton
- Sportswear Clothing Stores, East Alton - Sports Clothes
- Staffing & Support Services, East Alton
- Stamp Collecting & Coin Dealers , East Alton
- State Government, East Alton
- Steel Manufacturers, East Alton
- Stereo, Audio & Video Equipment Dealers & Stores, East Alton
- Sunrooms & Solarium Construction Contractors, East Alton - Build & Repair
- Sunrooms, Greenhouses, Solariums & Atrium Builders, East Alton - Build & Repair
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