- Safety & Security Systems & Consultants, South Houston
- Safety Equipment & Supplies, South Houston
- Sandwich Shop Restaurants, South Houston
- Scales Retail, South Houston
- School Bus Transportation Service, South Houston
- Scrap & Waste Materials, South Houston
- Seafood Restaurants, South Houston
- Secondary Schools, South Houston
- Secretarial & Court Reporting Services, South Houston
- Security & Surveillance System & Equipment, South Houston
- Security Alarm Systems - Home & Business, South Houston
- Security Consultants, South Houston
- Security Control Systems & Monitoring, South Houston - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, South Houston
- Sewer & Drain Cleaning & Repair, South Houston - Drain Cleaner & Installation Services
- Shoe Dyers, South Houston
- Shoe Repair Shops, South Houston
- Shoe Store - More, South Houston
- Shoe Stores, South Houston - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, South Houston
- Signs, South Houston
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- Skateboards & Equipment Shops, South Houston - Skateboarding Supplies
- Snacks & Desserts, South Houston
- Social Services & Welfare, South Houston
- Societies & Foundation Associations, South Houston
- Special Coatings, South Houston - Protective Coatings
- Special Dies Tools Jigs & Fixtures Manufacturers, South Houston
- Special Events & Party Supply Rental, South Houston
- Speciality Food Stores, South Houston
- Specialty Stores, South Houston
- Sporting Goods Stores, South Houston
- Sports Bars & Lounges, South Houston
- Spraying Booths & Equipment, South Houston
- Stamp Collecting & Coin Dealers , South Houston
- Steel & Metal Goods, South Houston - Steel Distributors
- Steel Manufacturers, South Houston
- Store Fixtures & Display Equipment, South Houston
- Store Fronts, South Houston - Storefront
- Surveyor Services, South Houston - Surveying Service
- Swimming Pool, Sauna & Spa Contractors, South Houston
- Swimming Pools Contractors, South Houston - Install Inground - Above Ground Pools
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