- Sand Gravel & Aggregate, North Smithfield
- Sandwich Shop Restaurants, North Smithfield
- Scientific & Laboratory Equipment & Instruments, North Smithfield
- Sealcoating, North Smithfield - Asphalt Sealcoating & Paving
- Security Brokers & Dealers, North Smithfield
- Septic Tank Pumping & Cleaning, North Smithfield - Septic Systems
- Septic Tanks & Systems, North Smithfield - Wholesale, Dealers & Suppliers
- Shoe Stores, North Smithfield - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, North Smithfield
- Siding Contractors, North Smithfield - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, North Smithfield
- Skating Rink & Hockey Operation Services, North Smithfield
- Ski Shops - Equipment & Supplies Sales & Rental, North Smithfield
- Ski, Snowboard & Snowmobile Shop - Equipment Rental & Services, North Smithfield
- Sleds, Snowboards & Snowshoes Shops, North Smithfield - Snow Sleds, Toboggans, Helmets, Boots, Goggles, Clothing, Gear & More
- Snacks & Desserts, North Smithfield
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- Social Services & Welfare, North Smithfield
- Social Workers & Services, North Smithfield
- Special Interest Schools Or Instruction, North Smithfield
- Specialty Stores, North Smithfield
- Sporting Goods Stores, North Smithfield
- Sports & Recreational Services, North Smithfield
- Sportswear Clothing Stores, North Smithfield - Sports Clothes
- Sprinkler System Contractors, North Smithfield - Garden & Lawn Sprinkler System Installation & Repair
- State Government, North Smithfield
- Store Fixtures, North Smithfield
- Surveyor Services, North Smithfield - Surveying Service
- Surveyors, North Smithfield
- Swimming Pool, Sauna & Spa Contractors, North Smithfield
- Swimming Pools Contractors, North Smithfield - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, North Smithfield
- Swimming Pools Supplies, Equipment & Accessories, North Smithfield
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