- Salvation Army, Assiniboia
- Sand Gravel & Aggregate, Assiniboia
- Sandwich Shop Restaurants, Assiniboia
- Scrapbooks & Scrapbook Supplies, Assiniboia
- Secondary Schools, Assiniboia
- Security Brokers & Dealers, Assiniboia
- Seed & Grain Cleaning, Assiniboia
- Seed Pedigreed, Assiniboia
- Septic Tanks & Systems, Assiniboia
- Sewer Cleaning Equipment & Supplies, Assiniboia - Sewer Builders
- Sewer Construction Contractors, Assiniboia - Sewer Line, Pipe Installation & Repair Services
- Shopping & Shopping Services, Assiniboia
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- Signs, Assiniboia
- Skating Rink & Hockey Operation Services, Assiniboia
- Snow Removal Services, Assiniboia - Snow Plow Service
- Snowmobile Dealers, Assiniboia - Parts, Gear, Clothing & Accessories
- Social Clubs & Organizations, Assiniboia
- Social Services & Welfare, Assiniboia
- Specialty Stores, Assiniboia
- Sporting Goods Stores, Assiniboia
- State Government, Assiniboia
- Steak House Restaurants, Assiniboia
- Steel Manufacturers, Assiniboia
- Swimming Pools, Assiniboia
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