- Scrap & Waste Machinery, Holtville
- Scrap & Waste Materials, Holtville
- Secretarial & Court Reporting Services, Holtville
- Seed Companies, Holtville
- Seeds & Bulbs Wholesale & Growers, Holtville
- Septic Tanks & Septic Systems Contractors, Holtville - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sheet Metal Contractors, Holtville - Sheet Metal Fabrication
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