- Sales & Marketing Consultant, Mercer Island
- Sandwich Shop Restaurants, Mercer Island
- Savings Banks, Mercer Island
- Scrap & Waste Materials, Mercer Island
- Secondary Schools, Mercer Island
- Security & Surveillance System & Equipment, Mercer Island
- Security Brokers & Dealers, Mercer Island
- Security Services, Mercer Island
- Sewer & Drain Cleaning & Repair, Mercer Island - Drain Cleaner & Installation Services
- Sewer Cleaning Equipment & Supplies, Mercer Island - Sewer Builders
- Shoe Repair & Shoeshine Parlors, Mercer Island
- Shoe Repair Shops, Mercer Island
- Shopping & Shopping Services, Mercer Island
- Ski & Snowboard Instructions, Mercer Island
- Ski, Snowboard & Snowmobile Shop - Equipment Rental & Services, Mercer Island
- Snacks & Desserts, Mercer Island
- Social Services & Welfare, Mercer Island
- Social Workers & Services, Mercer Island
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- Special Interest Schools Or Instruction, Mercer Island
- Specialty Stores, Mercer Island
- Sporting Goods Stores, Mercer Island
- Sportswear Manufacturers, Mercer Island
- Sportswear Wholesale, Mercer Island
- Staffing & Support Services, Mercer Island
- Stamp Collecting & Coin Dealers , Mercer Island
- State Government, Mercer Island
- Stock & Bond Brokers & Dealers, Mercer Island
- Stocks & Bond Brokers, Mercer Island
- Submarine Sandwich Restaurants, Mercer Island
- Surveyor Services, Mercer Island - Surveying Service
- Surveyors, Mercer Island
- Sushi Restaurants, Mercer Island
- Swimming Lessons & Classes, Mercer Island
- Swimming Pools, Mercer Island
- Synagogues & Temples, Mercer Island
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