- Sandwich Shop Restaurants, Ottawa
- Schools For The Physically Challenged, Ottawa
- Scrap & Waste Materials, Ottawa
- Screen Houses, Ottawa
- Screen Printing, Ottawa
- Secondary Schools, Ottawa
- Security Brokers & Dealers, Ottawa
- Seeds & Bulbs Wholesale & Growers, Ottawa
- Senior Citizens Information & Services, Ottawa
- Senior Citizens Service & Health Organizations, Ottawa
- Septic Tank Installation & Repair, Ottawa - Septic Systems
- Septic Tank Pumping & Cleaning, Ottawa - Septic Systems
- Septic Tanks & Septic Systems Contractors, Ottawa - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sewer & Drain Cleaning & Repair, Ottawa - Drain Cleaner & Installation Services
- Sheet Metal Contractors, Ottawa - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Ottawa
- Shopping & Shopping Services, Ottawa
- Signs, Ottawa
- Snow Removal Services, Ottawa - Snow Plow Service
- Social Services & Welfare, Ottawa
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- Societies & Foundation Associations, Ottawa
- Special Dies Tools Jigs & Fixtures Manufacturers, Ottawa
- Special Education & Care, Ottawa
- Special Interest Schools Or Instruction, Ottawa
- Speciality Food Stores, Ottawa
- Specialty Stores, Ottawa
- Speech & Hearing Specialists, Ottawa
- Speech Pathologists, Ottawa - Speech & Language Therapy
- Sporting Goods Stores, Ottawa
- Staffing & Support Services, Ottawa
- State Government, Ottawa
- Steel & Metal Goods, Ottawa - Steel Distributors
- Steel Fabrication & Processing Equipment, Ottawa
- Stocks & Bond Brokers, Ottawa
- Stoves & Furnace Equipment, Ottawa - Fittings & Repair Parts
- Surplus & Salvage Merchandise, Ottawa
- Surveyor Services, Ottawa - Surveying Service
- Swimming Pool, Sauna & Spa Contractors, Ottawa
- Swimming Pools Contractors, Ottawa - Install Inground - Above Ground Pools
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