- Sand Gravel & Aggregate, Mckinleyville
- Sandwich Shop Restaurants, Mckinleyville
- Screen Printing, Mckinleyville
- Screens Doors & Windows, Mckinleyville
- Seafood Restaurants, Mckinleyville
- Secondary Schools, Mckinleyville
- Security Brokers & Dealers, Mckinleyville
- Seeds & Bulbs Wholesale & Growers, Mckinleyville
- Senior Citizens Service & Health Organizations, Mckinleyville
- Septic Tank Installation & Repair, Mckinleyville - Septic Systems
- Septic Tank Pumping & Cleaning, Mckinleyville - Septic Systems
- Septic Tanks & Septic Systems Contractors, Mckinleyville - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sewer Cleaning Equipment & Supplies, Mckinleyville - Sewer Builders
- Shirts & T-Shirts, Mckinleyville
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- Shopping & Shopping Services, Mckinleyville
- Signs, Mckinleyville
- Smog Check, Brake & Lamp Inspection & Repair, Mckinleyville
- Snacks & Desserts, Mckinleyville
- Social Services & Welfare, Mckinleyville
- Social Workers & Services, Mckinleyville
- Societies & Foundation Associations, Mckinleyville
- Specialty Stores, Mckinleyville
- Sporting Goods Stores, Mckinleyville
- Sports & Recreational Services, Mckinleyville
- Sprinkler System Contractors, Mckinleyville - Garden & Lawn Sprinkler System Installation & Repair
- Staffing & Support Services, Mckinleyville
- Stocks & Bond Brokers, Mckinleyville
- Sushi Restaurants, Mckinleyville
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