- Safe & Vault, Millbrae
- Safe, Lock & Key Repair Services, Millbrae - Safes & Vaults Opening & Repair
- Sandblasting Equipment & Supplies, Millbrae
- Sandwich Shop Restaurants, Millbrae
- Savings & Loan Associations, Millbrae
- Savings Banks, Millbrae
- Scientific & Laboratory Equipment & Instruments, Millbrae
- Screen Printing, Millbrae
- Seafood Restaurants, Millbrae
- Secondary Schools, Millbrae
- Security & Surveillance System & Equipment, Millbrae
- Security Brokers & Dealers, Millbrae
- Security Services, Millbrae
- Senior Citizens Housing, Millbrae
- Service Establishment Supplies & Equipment, Millbrae
- Sewer Construction Contractors, Millbrae - Sewer Line, Pipe Installation & Repair Services
- Sewing Machines, Equipment & Supplies, Millbrae
- Sheet Metal Contractors, Millbrae - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Millbrae
- Shoe Repair Shops, Millbrae
- Shoe Store - More, Millbrae
- Shoe Stores, Millbrae - Mens, Womens & Kids Shoes
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- Shopping & Shopping Services, Millbrae
- Signs, Millbrae
- Ski Equipment & Supplies Shops, Millbrae - Skiing Helmets, Goggles, Clothes, Boots, Gear & Accessories
- Skin Care & Cosmetology Salons, Millbrae
- Skin Care Products & Treatments, Millbrae
- Sleds, Snowboards & Snowshoes Shops, Millbrae - Snow Sleds, Toboggans, Helmets, Boots, Goggles, Clothing, Gear & More
- Small Appliances, Millbrae
- Smog Check, Brake & Lamp Inspection & Repair, Millbrae
- Snacks & Desserts, Millbrae
- Social Services & Welfare, Millbrae
- Societies & Foundation Associations, Millbrae
- Special Interest Schools Or Instruction, Millbrae
- Specialty Stores, Millbrae
- Sporting Goods Stores, Millbrae
- Sprinkler Alarm Systems, Millbrae - Fire Sprinkler Systems
- Stamp Collecting & Coin Dealers , Millbrae
- State Government, Millbrae
- Steam Cleaner - Commercial & Industrial, Millbrae - Steam Cleaning - Upholstery, Floor, Carpet, etc
- Stucco Siding Contractors, Millbrae - Stucco Repair & Installation
- Stucco Siding, Granite & Grouting Contractors, Millbrae
- Surveyor Services, Millbrae - Surveying Service
- Sushi Restaurants, Millbrae
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