- Sandblasting, Plessisville - General Contractors
- Sandwich Shop Restaurants, Plessisville
- Savings & Loan Associations, Plessisville
- Savings Banks, Plessisville
- Sawmill Equipment & Supplies, Plessisville
- Sawmill, Paper & Woodworking Supplies, Machinery & Equipment, Plessisville
- Scientific Equipment, Plessisville
- Scientific Services, Plessisville
- Screening & Sifting Equipment & Services, Plessisville
- Secondary Schools, Plessisville
- Security Alarm Systems - Home & Business, Plessisville
- Security Services, Plessisville
- Septic Tanks & Systems, Plessisville - Wholesale, Dealers & Suppliers
- Sheet Metal Contractors, Plessisville - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Plessisville
- Shoe Repair Shops, Plessisville
- Shoe Stores, Plessisville - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Plessisville
- Siding Contractors, Plessisville - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Skating Supplies, Plessisville - Ice, Inline, Speed, Figure & Roller Skates
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- Small Appliances, Plessisville
- Snow Removal Services, Plessisville - Snow Plow Service
- Social Clubs & Organizations, Plessisville
- Social Services & Welfare, Plessisville
- Societies & Foundation Associations, Plessisville
- Speciality Food Stores, Plessisville
- Specialty Goods Storage, Plessisville
- Specialty Stores, Plessisville
- Sporting Goods Stores, Plessisville
- Sportswear Clothing Stores, Plessisville - Sports Clothes
- Stainless Steel, Plessisville
- Steel & Metal Goods, Plessisville - Steel Distributors
- Steel Fabrications Specialties, Plessisville
- Sugar Refiners, Plessisville
- Suicide Prevention Service & Counseling, Plessisville
- Surveyor Services, Plessisville - Surveying Service
- Surveyors, Plessisville
- Swimming Pool, Sauna & Spa Contractors, Plessisville
- Swimming Pools Contractors, Plessisville - Install Inground - Above Ground Pools
- Swimwear & Accessories Shops, Plessisville - Water Sports Equipment
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