- Sandwich Shop Restaurants, Youngsville
- Scientific & Laboratory Equipment & Instruments, Youngsville
- Scrap & Waste Materials, Youngsville
- Seafood Restaurants, Youngsville
- Secondary Schools, Youngsville
- Security Brokers & Dealers, Youngsville
- Security Investigative Services, Youngsville
- Security Services, Youngsville
- Sewer & Drain Cleaning & Repair, Youngsville - Drain Cleaner & Installation Services
- Sewer Cleaning Equipment & Supplies, Youngsville - Sewer Builders
- Sheet Metal Contractors, Youngsville - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Youngsville
- Shopping & Shopping Services, Youngsville
- Shutters - Interior & Exterior, Youngsville - Wood, Vinyl, Window, Plantation Shutters, etc
- Siding Contractors, Youngsville - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
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- Snacks & Desserts, Youngsville
- Snow Cone Stands, Youngsville
- Social Clubs & Organizations, Youngsville
- Social Services & Welfare, Youngsville
- Special Interest Schools Or Instruction, Youngsville
- Specialty Animal Services, Youngsville
- Specialty Stores, Youngsville
- Specialty Vehicle Rental & Leasing, Youngsville
- Sporting Goods Stores, Youngsville
- Sports Bars & Lounges, Youngsville
- Staffing & Support Services, Youngsville
- Stocks & Bond Brokers, Youngsville
- Submarine Sandwich Restaurants, Youngsville
- Surveyor Services, Youngsville - Surveying Service
- Synagogues & Temples, Youngsville
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