- Sales & Marketing Consultant, Sinton
- Sandblasting, Sinton - General Contractors
- Sandwich Shop Restaurants, Sinton
- Scrap & Waste Materials, Sinton
- Secondary Schools, Sinton
- Security & Surveillance System & Equipment, Sinton
- Security Brokers & Dealers, Sinton
- Security Services, Sinton
- Senior Citizens Housing, Sinton
- Sheriff's Department, Sinton
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