- Sales & Marketing Consultant, Eureka
- Sand Gravel & Aggregate, Eureka
- Sandblasting, Eureka - General Contractors
- Sandwich Shop Restaurants, Eureka
- Satellite Dish Antennas & Equipment Dealers, Eureka
- Savings Banks, Eureka
- Scrap & Waste Materials, Eureka
- Secondary Schools, Eureka
- Security Brokers & Dealers, Eureka
- Senior Citizens Service & Health Organizations, Eureka
- Sewer & Drain Cleaning & Repair, Eureka - Drain Cleaner & Installation Services
- Sewer Construction Contractors, Eureka - Sewer Line, Pipe Installation & Repair Services
- Sewing & Yarn Stores & Supplies, Eureka
- Sewing Machines, Equipment & Supplies, Eureka
- Shelving & Shelves, Eureka - Metal, Steel, Wire & Glass Shelving Units & Storage - Wall Shelves
- Shopping & Shopping Services, Eureka
- Siding Contractors, Eureka - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Eureka
- Ski Centers, Eureka
- Ski Resorts, Eureka
- Small Appliances, Eureka
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- Snacks & Desserts, Eureka
- Snow Removal Services, Eureka - Snow Plow Service
- Social Services & Welfare, Eureka
- Societies & Foundation Associations, Eureka
- Sod & Sodding Service, Eureka
- Special Dies Tools Jigs & Fixtures Manufacturers, Eureka
- Specialty Stores, Eureka
- Sporting & Recreational Camps, Eureka
- Sporting Goods Stores, Eureka
- Sports & Recreational Services, Eureka
- Sports Bars & Lounges, Eureka
- Stadiums, Arenas, Coliseums & Athletic Fields, Eureka
- State Government, Eureka
- Stocks & Bond Brokers, Eureka
- Stoves & Furnace Equipment, Eureka - Fittings & Repair Parts
- Stucco Siding Contractors, Eureka - Stucco Repair & Installation
- Stucco Siding, Granite & Grouting Contractors, Eureka
- Surgical Hospitals, Eureka - Surgical Centers
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Eureka
- Swimming Pools Supplies, Equipment & Accessories, Eureka
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