- Sandwich Shop Restaurants, Stittsville
- Satellite & Cable TV Equipment & Systems Repair & Service, Stittsville
- Satellite Dish Antennas & Equipment Dealers, Stittsville
- Scientific & Laboratory Equipment & Instruments, Stittsville
- Scottish Restaurants, Stittsville
- Screens Doors & Windows, Stittsville
- Secondary Schools, Stittsville
- Security Alarm Systems - Home & Business, Stittsville
- Security Brokers & Dealers, Stittsville
- Security Investigative Services, Stittsville
- Security Services, Stittsville
- Semiconductors & Equipment, Stittsville
- Senior Citizens Housing, Stittsville
- Sewing & Yarn Stores & Supplies, Stittsville
- Sharpening Service, Stittsville
- Shelving & Shelves, Stittsville - Metal, Steel, Wire & Glass Shelving Units & Storage - Wall Shelves
- Shelving Equipment, Stittsville
- Shoe Stores, Stittsville - Mens, Womens & Kids Shoes
- Shooting & Target Ranges, Stittsville
- Shopping & Shopping Services, Stittsville
- Sign Hanging & Installation Service, Stittsville - Signs Erectors & Hangers
- Signs, Stittsville
- Small Appliances, Stittsville
- Snow Removal Services, Stittsville - Snow Plow Service
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- Soccer Clubs, Stittsville
- Social Services & Welfare, Stittsville
- Societies & Foundation Associations, Stittsville
- Special Interest Schools Or Instruction, Stittsville
- Specialty Animal Services, Stittsville
- Specialty Stores, Stittsville
- Speech & Hearing Specialists, Stittsville
- Sporting Goods Stores, Stittsville
- Sports & Recreational Services, Stittsville
- Stairs & Railings Contractors, Stittsville - Metal & Wood Stairs, Spiral Staircase & Stair Railing - Installation & Repair
- Stairs, Balcony, Terrace & Steeple Contractors, Stittsville
- Steel Manufacturers, Stittsville
- Stock & Bond Brokers & Dealers, Stittsville
- Stocks & Bond Brokers, Stittsville
- Stone & Rock Quarry, Stittsville - Gravel Pit, Shale, Granite, Limestone, Crushed Rock, etc
- Store Fixtures & Display Equipment, Stittsville
- Stoves & Furnace Equipment, Stittsville - Fittings & Repair Parts
- Submarine Sandwich Restaurants, Stittsville
- Surveyor Services, Stittsville - Surveying Service
- Surveyors, Stittsville
- Swimming Pool, Sauna & Spa Contractors, Stittsville
- Swimming Pools Contractors, Stittsville - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Stittsville
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