- Sandwich Shop Restaurants, Smithville
- Satellite Dish Antennas & Equipment Dealers, Smithville
- Screen Printing, Smithville
- Security Brokers & Dealers, Smithville
- Senior Citizens Service & Health Organizations, Smithville
- Sewer & Drain Cleaning & Repair, Smithville - Drain Cleaner & Installation Services
- Sewer Cleaning Equipment & Supplies, Smithville - Sewer Builders
- Shirts & T-Shirts, Smithville
- Shopping & Shopping Services, Smithville
- Snow Removal Services, Smithville - Snow Plow Service
- Social Services & Welfare, Smithville
- Special Interest Schools Or Instruction, Smithville
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- Specialty Stores, Smithville
- Sporting Goods Stores, Smithville
- Sports & Recreational Services, Smithville
- Sportswear Clothing Stores, Smithville - Sports Clothes
- Sprinkler System Contractors, Smithville - Garden & Lawn Sprinkler System Installation & Repair
- Stocks & Bond Brokers, Smithville
- Stoves & Furnace Equipment, Smithville - Fittings & Repair Parts
- Submarine Sandwich Restaurants, Smithville
- Swimming Pool, Sauna & Spa Contractors, Smithville
- Swimming Pools Contractors, Smithville - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Smithville
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