- Sand Gravel & Aggregate, Louiseville
- Shoe Stores, Louiseville - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Louiseville
- Signs, Louiseville
- Silk Screen Printing, Louiseville
- Silkscreen Printing, Louiseville
- Small Appliances, Louiseville
- Snow Equipment & Supplies, Louiseville
- Snow Removal Services, Louiseville - Snow Plow Service
- Snowmobile Dealers, Louiseville - Parts, Gear, Clothing & Accessories
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- Snowmobile Equipment & Supplies, Louiseville
- Social Services & Welfare, Louiseville
- Societies & Foundation Associations, Louiseville
- Speciality Food Stores, Louiseville
- Specialty Stores, Louiseville
- Sporting Goods Stores, Louiseville
- Sports Clubs, Louiseville
- Substance Abuse Clinics, Louiseville - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Surveyor Services, Louiseville - Surveying Service
- Surveyors, Louiseville
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