- Sand Gravel & Aggregate, Hallettsville
- Sandwich Shop Restaurants, Hallettsville
- Savings Banks, Hallettsville
- Screen Houses, Hallettsville
- Screen Printing, Hallettsville
- Secondary Schools, Hallettsville
- Secretarial School, Hallettsville
- Security & Surveillance System & Equipment, Hallettsville
- Security Brokers & Dealers, Hallettsville
- Security Services, Hallettsville
- Seeds & Bulbs Wholesale & Growers, Hallettsville
- Septic Tank Installation & Repair, Hallettsville - Septic Systems
- Septic Tank Pumping & Cleaning, Hallettsville - Septic Systems
- Septic Tanks & Septic Systems Contractors, Hallettsville - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Shopping & Shopping Services, Hallettsville
- Siding Contractors, Hallettsville - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
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- Siding Materials, Hallettsville
- Small Appliances, Hallettsville
- Social Services & Welfare, Hallettsville
- Space Heaters, Hallettsville
- Specialty Animal Services, Hallettsville
- Specialty Stores, Hallettsville
- Sporting Goods Stores, Hallettsville
- Stadiums, Arenas, Coliseums & Athletic Fields, Hallettsville
- Staffing & Support Services, Hallettsville
- State Government, Hallettsville
- Steel Detailers, Hallettsville
- Steel Fabrications Specialties, Hallettsville
- Steel Manufacturers, Hallettsville
- Steel Work Contractors, Hallettsville
- Stocks & Bond Brokers, Hallettsville
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