- Sandwich Shop Restaurants, Sioux Lookout
- School - Christian, Sioux Lookout
- Secondary Schools, Sioux Lookout
- Security Brokers & Dealers, Sioux Lookout
- Senior Citizens Service & Health Organizations, Sioux Lookout
- Sewing Machine Repair & Service, Sioux Lookout
- Sewing Machines, Equipment & Supplies, Sioux Lookout
- Shopping & Shopping Services, Sioux Lookout
- Siding Materials, Sioux Lookout
- Sightseeing Tours, Sioux Lookout
- Signs, Sioux Lookout
- Ski, Snowboard & Snowmobile Shop - Equipment Rental & Services, Sioux Lookout
- Small Appliances, Sioux Lookout
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- Snowmobile Centers & Resorts, Sioux Lookout
- Social Clubs & Organizations, Sioux Lookout
- Social Services & Welfare, Sioux Lookout
- Societies & Foundation Associations, Sioux Lookout
- Soil Testing Labs, Sioux Lookout - Concrete Testing
- Specialty Stores, Sioux Lookout
- Specialty Vehicle Rental & Leasing, Sioux Lookout
- Sporting Goods Stores, Sioux Lookout
- Sports Bars & Lounges, Sioux Lookout
- Staffing & Support Services, Sioux Lookout
- Stoves & Furnace Equipment, Sioux Lookout - Fittings & Repair Parts
- Substance Abuse Outpatient Clinics, Sioux Lookout
- Surveyor Services, Sioux Lookout - Surveying Service
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