- Safe Deposit Box Services, Mathis
- Sand Gravel & Aggregate, Mathis
- Sandwich Shop Restaurants, Mathis
- Scrap & Waste Materials, Mathis
- Secondary Schools, Mathis
- Security & Surveillance System & Equipment, Mathis
- Security Services, Mathis
- Senior Citizens Service & Health Organizations, Mathis
- Septic Tanks & Septic Systems Contractors, Mathis - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Shipping Service, Mathis
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