- Safety & Security Systems & Consultants, Aurora
- Sandwich Shop Restaurants, Aurora
- Savings & Loan Associations, Aurora
- Savings Banks, Aurora
- School - Catholic, Aurora
- School - Christian, Aurora
- Scrap & Waste Materials, Aurora
- Screen Printing, Aurora
- Secondary Schools, Aurora
- Security Brokers & Dealers, Aurora
- Sewer & Drain Cleaning & Repair, Aurora - Drain Cleaner & Installation Services
- Sewing & Yarn Stores & Supplies, Aurora
- Sheet Metal Contractors, Aurora - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Aurora
- Shoe Repair & Shoeshine Parlors, Aurora
- Shoe Repair Shops, Aurora
- Shoe Store - More, Aurora
- Shoe Stores, Aurora - Mens, Womens & Kids Shoes
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- Shopping & Shopping Services, Aurora
- Sleep Disorders Treatment & Information Centers, Aurora
- Sleep Doctors, Aurora - Specialists, Physicians & Surgeons (Sleep Medicine)
- Snacks & Desserts, Aurora
- Social Services & Welfare, Aurora
- Societies & Foundation Associations, Aurora
- Special Interest Schools Or Instruction, Aurora
- Specialty Stores, Aurora
- Sporting Goods Stores, Aurora
- Sports & Recreational Services, Aurora
- State Government, Aurora
- Steel Manufacturers, Aurora
- Stocks & Bond Brokers, Aurora
- Stoves & Furnace Equipment, Aurora - Fittings & Repair Parts
- Submarine Sandwich Restaurants, Aurora
- Swimming Pool, Sauna & Spa Contractors, Aurora
- Swimming Pools Contractors, Aurora - Install Inground - Above Ground Pools
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