- Sand Gravel & Aggregate, Gatesville
- Sandwich Shop Restaurants, Gatesville
- Savings & Loan Associations, Gatesville
- Savings Banks, Gatesville
- Scrap & Waste Materials, Gatesville
- Screen Printing, Gatesville
- Seafood Restaurants, Gatesville
- Secondary Schools, Gatesville
- Security & Surveillance System & Equipment, Gatesville
- Security Brokers & Dealers, Gatesville
- Security Services, Gatesville
- Senior Citizens Service & Health Organizations, Gatesville
- Septic Tanks & Septic Systems Contractors, Gatesville - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sewing & Yarn Stores & Supplies, Gatesville
- Shipyards, Gatesville
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- Shirts & T-Shirts, Gatesville
- Shoe Stores, Gatesville - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Gatesville
- Snacks & Desserts, Gatesville
- Social Clubs & Organizations, Gatesville
- Social Services & Welfare, Gatesville
- Special Events & Party Supply Rental, Gatesville
- Specialty Stores, Gatesville
- Sporting Goods Stores, Gatesville
- State Government, Gatesville
- Steak House Restaurants, Gatesville
- Stocks & Bond Brokers, Gatesville
- Substance Abuse Clinics, Gatesville - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Gatesville
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