- Sandwich Shop Restaurants, Houston
- Satellite TV Service, Houston
- Sawmill & Planing Mills, Houston
- Sawmill Supplies & Equipment Repair, Houston
- Secondary Schools, Houston
- Security Alarm Systems - Home & Business, Houston
- Security Brokers & Dealers, Houston
- Security Control Systems & Monitoring, Houston - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Houston
- Seeds & Bulbs Wholesale & Growers, Houston
- Septic Tank Installation & Repair, Houston - Septic Systems
- Septic Tank Pumping & Cleaning, Houston - Septic Systems
- Septic Tanks & Septic Systems Contractors, Houston - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
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- Septic Tanks & Systems Contractors & Designers, Houston
- Shelving Equipment, Houston
- Shelving Manufacturers, Houston
- Shopping & Shopping Services, Houston
- Siding Contractors, Houston - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Houston
- Snacks & Desserts, Houston
- Social Services & Welfare, Houston
- Specialty Stores, Houston
- Store & Retail Fixtures & Display Manufacturers, Houston
- Store Fixtures & Display Equipment, Houston
- Submarine Sandwich Restaurants, Houston
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