- Safety Equipment & Supplies, Ottawa
- Sandblasting, Ottawa - General Contractors
- Sandwich Shop Restaurants, Ottawa
- Satellite TV Service, Ottawa
- School - Christian, Ottawa
- Secondary Schools, Ottawa
- Security Brokers & Dealers, Ottawa
- Security Services, Ottawa
- Seeds & Bulbs Wholesale & Growers, Ottawa
- Senior Citizens Housing, Ottawa
- Senior Citizens Service & Health Organizations, Ottawa
- Sewer & Drain Cleaning & Repair, Ottawa - Drain Cleaner & Installation Services
- Shipping Service, Ottawa
- Shoe Stores, Ottawa - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Ottawa
- Siding Contractors, Ottawa - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Ottawa
- Snack Foods, Ottawa
- Snacks & Desserts, Ottawa
- Social Services & Welfare, Ottawa
- Societies & Foundation Associations, Ottawa
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- Sound Systems, Microphones & Equipment, Ottawa
- Special Interest Schools Or Instruction, Ottawa
- Specialty Communication Companies & Services, Ottawa
- Specialty Stores, Ottawa
- Sporting Goods Stores, Ottawa
- Staffing & Support Services, Ottawa
- State Government, Ottawa
- State Highway Patrol, Ottawa
- State Law Enforcement, Ottawa
- Steak House Restaurants, Ottawa
- Steel Detailers, Ottawa
- Steel Manufacturers, Ottawa
- Steel Work Contractors, Ottawa
- Stocks & Bond Brokers, Ottawa
- Stone & Rock Quarry, Ottawa - Gravel Pit, Shale, Granite, Limestone, Crushed Rock, etc
- Storage Trailers & Containers, Ottawa
- Storm Doors & Windows, Ottawa
- Stoves & Furnace Equipment, Ottawa - Fittings & Repair Parts
- Submarine Sandwich Restaurants, Ottawa
- Substance Abuse Clinics, Ottawa - Alcoholism, Addiction & Drug Abuse Treatment Centers
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