- Sandwich Shop Restaurants, Houston
- Secondary Schools, Houston
- Security Brokers & Dealers, Houston
- Senior Citizens Service & Health Organizations, Houston
- Septic Tanks & Systems, Houston - Wholesale, Dealers & Suppliers
- Shoe Stores, Houston - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Houston
- Signs, Houston
- Social Services & Welfare, Houston
- Societies & Foundation Associations, Houston
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- Specialty Stores, Houston
- Sporting Goods Stores, Houston
- Sportswear Clothing Stores, Houston - Sports Clothes
- Staffing & Support Services, Houston
- State Government, Houston
- Stocks & Bond Brokers, Houston
- Stone, Houston
- Stone & Rock Quarry, Houston - Gravel Pit, Shale, Granite, Limestone, Crushed Rock, etc
- Submarine Sandwich Restaurants, Houston
- Surveyor Services, Houston - Surveying Service
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