- Sand Gravel & Aggregate, Martensville
- Sandwich Shop Restaurants, Martensville
- Scientific & Laboratory Equipment & Instruments, Martensville
- Secondary Schools, Martensville
- Senior Citizens Information & Services, Martensville
- Shopping & Shopping Services, Martensville
- Signs, Martensville
- Skid Loader Service Contractors, Martensville
- Skid Steer Sales, Martensville
- Snow Removal Services, Martensville - Snow Plow Service
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- Snowmobile Dealers, Martensville - Parts, Gear, Clothing & Accessories
- Social Clubs & Organizations, Martensville
- Social Services & Welfare, Martensville
- Specialty Stores, Martensville
- Sporting Goods Stores, Martensville
- Steel Manufacturers, Martensville
- Steel Mills & Blast Furnaces, Martensville
- Steel Products, Martensville
- Stoves & Furnace Equipment, Martensville - Fittings & Repair Parts
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