- Salvage Yards, Junk Yards & Wrecker Service, Willcox
- Satellite Descrambling & Programming Service, Willcox
- Satellite TV Service, Willcox
- Secondary Schools, Willcox
- Security Brokers & Dealers, Willcox
- Septic Tank Installation & Repair, Willcox - Septic Systems
- Septic Tank Pumping & Cleaning, Willcox - Septic Systems
- Septic Tanks & Septic Systems Contractors, Willcox - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Septic Tanks & Systems Contractors & Designers, Willcox
- Sewer & Drain Cleaning & Repair, Willcox - Drain Cleaner & Installation Services
- Sheet Metal Contractors, Willcox - Sheet Metal Fabrication
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- Sheet Metal Fabricators & Ductwork Contractors, Willcox
- Shoe Stores, Willcox - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Willcox
- Snacks & Desserts, Willcox
- Social Services & Welfare, Willcox
- Solar Products & Services, Willcox
- Specialty Animal Services, Willcox
- Specialty Stores, Willcox
- State Government, Willcox
- Stock & Bond Brokers & Dealers, Willcox
- Stocks & Bond Brokers, Willcox
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