- Safety & Security Systems & Consultants, North Aurora
- Sandwich Shop Restaurants, North Aurora
- Satellite Dish Antennas & Equipment Dealers, North Aurora
- Sawmill, Paper & Woodworking Supplies, Machinery & Equipment, North Aurora
- Scientific & Laboratory Equipment & Instruments, North Aurora
- Secondary Schools, North Aurora
- Security Brokers & Dealers, North Aurora
- Senior Citizens Service & Health Organizations, North Aurora
- Sheet Metal Contractors, North Aurora - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, North Aurora
- Shoe Stores, North Aurora - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, North Aurora
- Signs, North Aurora
- Snacks & Desserts, North Aurora
- Snow Removal Services, North Aurora - Snow Plow Service
- Social Services & Welfare, North Aurora
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- Sound Systems & Recording Equipment, North Aurora
- Special Needs Transportation, North Aurora
- Specialty Animal Services, North Aurora
- Specialty Rental Services, North Aurora
- Specialty Stores, North Aurora
- Sporting & Recreational Camps, North Aurora
- Sporting Goods Stores, North Aurora
- Sports Motivational Training, North Aurora
- Staffing & Support Services, North Aurora
- State Government, North Aurora
- Stock & Bond Brokers & Dealers, North Aurora
- Stocks & Bond Brokers, North Aurora
- Storage & Closet Equipment Supplies & Materials, North Aurora
- Stoves & Furnace Equipment, North Aurora - Fittings & Repair Parts
- Summer Camps, North Aurora
- Sushi Restaurants, North Aurora
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