- Sand Gravel & Aggregate, Houston
- Sandwich Shop Restaurants, Houston
- Satellite Communication Downlinking & Uplinking, Houston
- Sawmill & Planing Mills, Houston
- Sawmill Construction & Maintenance, Houston
- Sawmill Supplies & Equipment Repair, Houston
- Scrap & Waste Machinery, Houston
- Scrap & Waste Materials, Houston
- Screens Doors & Windows, Houston
- Secondary Schools, Houston
- Senior Citizens Service & Health Organizations, Houston
- Septic Tanks & Systems, Houston - Wholesale, Dealers & Suppliers
- Shopping & Shopping Services, Houston
- Siding Materials, Houston
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- Sikh Church, Houston
- Snow Removal Services, Houston - Snow Plow Service
- Snowmobile Dealers, Houston - Parts, Gear, Clothing & Accessories
- Social Services & Welfare, Houston
- Solar Equipment, Houston
- Special Education & Care, Houston
- Specialty Stores, Houston
- Sporting Goods Stores, Houston
- State Government, Houston
- Steel Manufacturers, Houston
- Storage Containers, Houston
- Stoves & Furnace Equipment, Houston - Fittings & Repair Parts
- Swimming Pools, Houston
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