- Safety & Security Systems & Consultants, Clearlake
- Sand Gravel & Aggregate, Clearlake
- Sandwich Shop Restaurants, Clearlake
- Savings Banks, Clearlake
- Scrap & Waste Machinery, Clearlake
- Scrap & Waste Materials, Clearlake
- Screen Printing, Clearlake
- Screens Doors & Windows, Clearlake
- Secondary Schools, Clearlake
- Senior Citizens Housing, Clearlake
- Senior Citizens Service & Health Organizations, Clearlake
- Septic Tanks & Septic Systems Contractors, Clearlake - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sewing Machines, Equipment & Supplies, Clearlake
- Shirts & T-Shirts, Clearlake
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- Shoe Stores, Clearlake - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Clearlake
- Signs, Clearlake
- Skin Care & Cosmetology Salons, Clearlake
- Skin Care Products & Treatments, Clearlake
- Small Appliances, Clearlake
- Smog Check, Brake & Lamp Inspection & Repair, Clearlake
- Social Services & Welfare, Clearlake
- Solar Products & Services, Clearlake
- Specialty Animal Services, Clearlake
- Specialty Stores, Clearlake
- Stamp Collecting & Coin Dealers , Clearlake
- Support Services, Clearlake
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