- Sand Gravel & Aggregate, Smithville
- Sandblasting, Smithville - General Contractors
- Sandwich Shop Restaurants, Smithville
- Sawmill & Planing Mills, Smithville
- Sawmill Supplies & Equipment Repair, Smithville
- Scrap & Waste Materials, Smithville
- Secondary Schools, Smithville
- Seminars & Workshops, Smithville
- Service Establishment Supplies & Equipment, Smithville
- Sheet Metal Contractors, Smithville - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Smithville
- Shelving & Shelves, Smithville - Metal, Steel, Wire & Glass Shelving Units & Storage - Wall Shelves
- Shipping Companies, Smithville
- Shock Absorber, Smithville
- Shock Absorbers & Struts, Smithville
- Shopping & Shopping Services, Smithville
- Skating Rink & Hockey Operation Services, Smithville
- Skating Rinks & Instructions, Smithville
- Soccer Clubs, Smithville
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- Social Services & Welfare, Smithville
- Societies & Foundation Associations, Smithville
- Special Events Photographers, Smithville
- Special Interest Schools Or Instruction, Smithville
- Specialty Animal Services, Smithville
- Specialty Stores, Smithville
- Sporting Goods Equipment Rental, Smithville
- Sporting Goods Stores, Smithville
- Sports Clubs, Smithville
- Springs Automotive, Smithville
- Staffing & Support Services, Smithville
- Stamp Collecting & Coin Dealers , Smithville
- Stationery & Office Supplies, Smithville
- Steel Manufacturers, Smithville
- Stitching Services, Smithville
- Stoves & Furnace Equipment, Smithville - Fittings & Repair Parts
- Submarine Sandwich Restaurants, Smithville
- Sweepers & Scrubbers Industrial, Smithville - Sweeping Service
- Swimming Pools Supplies, Equipment & Accessories, Smithville
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