- Salvage Yards, Junk Yards & Wrecker Service, Brownsville
- Sand Gravel & Aggregate, Brownsville
- Sandwich Shop Restaurants, Brownsville
- Satellite Dish Antennas & Equipment Dealers, Brownsville
- Satellite TV Service, Brownsville
- Sawmill & Planing Mills, Brownsville
- Sawmill Supplies & Equipment Repair, Brownsville
- Scrap & Waste Machinery, Brownsville
- Scrap & Waste Materials, Brownsville
- Secondary Schools, Brownsville
- Security & Surveillance System & Equipment, Brownsville
- Security Alarm Systems - Home & Business, Brownsville
- Security Control Systems & Monitoring, Brownsville - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Investigative Services, Brownsville
- Security Services, Brownsville
- Seeds & Bulbs Wholesale & Growers, Brownsville
- Senior Citizens Service & Health Organizations, Brownsville
- Sheet Metal Contractors, Brownsville - Sheet Metal Fabrication
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- Sheet Metal Fabricators & Ductwork Contractors, Brownsville
- Shirts & T-Shirts, Brownsville
- Shoe Manufacturers Supplies, Brownsville
- Shopping & Shopping Services, Brownsville
- Signs, Brownsville
- Snacks & Desserts, Brownsville
- Soaps & Detergents Manufacturers, Brownsville
- Social Clubs & Organizations, Brownsville
- Social Services & Welfare, Brownsville
- Sod & Sodding Service, Brownsville
- Sod Farms, Brownsville
- Specialty Stores, Brownsville
- Sporting Goods Stores, Brownsville
- State Government, Brownsville
- Substance Abuse Clinics, Brownsville - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Surveyor Services, Brownsville - Surveying Service
- Surveyors, Brownsville
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