- Safety & Security Systems & Consultants, Los Altos
- Sales & Marketing Consultant, Los Altos
- Satellite & Cable TV Equipment & Systems Repair & Service, Los Altos
- Satellite Descrambling & Programming Service, Los Altos
- Satellite Dish Antennas & Equipment Dealers, Los Altos
- Satellite Technology & Space Research, Los Altos
- Satellite TV Service, Los Altos
- Savings Banks, Los Altos
- Science Of Mind Churches, Los Altos
- Scientific & Laboratory Equipment & Instruments, Los Altos
- Scientific Services, Los Altos
- Secondary Schools, Los Altos
- Secretarial & Court Reporting Services, Los Altos
- Security & Surveillance System & Equipment, Los Altos
- Security Alarm Systems - Home & Business, Los Altos
- Security Brokers & Dealers, Los Altos
- Security Consultants, Los Altos
- Security Investigative Services, Los Altos
- Security Services, Los Altos
- Self Defense Programs, Los Altos
- Semiconductors & Equipment, Los Altos
- Senior Citizens Service & Health Organizations, Los Altos
- Service Establishment Supplies & Equipment, Los Altos
- Sewer & Drain Cleaning & Repair, Los Altos - Drain Cleaner & Installation Services
- Sewer Construction Contractors, Los Altos - Sewer Line, Pipe Installation & Repair Services
- Sewing & Yarn Stores & Supplies, Los Altos
- Shoe Repair & Shoeshine Parlors, Los Altos
- Shoe Repair Shops, Los Altos
- Shoe Stores, Los Altos - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Los Altos
- Short Term Business Credit Institutions, Los Altos
- Skateboards & Equipment Shops, Los Altos - Skateboarding Supplies
- Skin Care & Cosmetology Salons, Los Altos
- Skin Care Products & Treatments, Los Altos
- Skylights, Los Altos - Skylight Shades, Blinds, Covers & More
- Small Appliances, Los Altos
- Small Business & Office Equipment Repair Services, Los Altos
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- Smog Check, Brake & Lamp Inspection & Repair, Los Altos
- Snack Foods, Los Altos
- Snacks & Desserts, Los Altos
- Social Clubs & Organizations, Los Altos
- Social Services & Welfare, Los Altos
- Social Workers & Services, Los Altos
- Societies & Foundation Associations, Los Altos
- Sod & Sodding Service, Los Altos
- Solar Energy Companies - Contractors, Los Altos - Solar Panel Installation - Solar Power Systems
- Solariums & Garden Rooms, Los Altos
- Special Interest Schools Or Instruction, Los Altos
- Speciality Food Stores, Los Altos
- Specialty Stores, Los Altos
- Speech & Hearing Specialists, Los Altos
- Speech Pathologists, Los Altos - Speech & Language Therapy
- Sporting & Recreational Camps, Los Altos
- Sporting Goods Stores, Los Altos
- Sports Bars & Lounges, Los Altos
- Sprinkler Alarm Systems, Los Altos - Fire Sprinkler Systems
- Sprinkler System Contractors, Los Altos - Garden & Lawn Sprinkler System Installation & Repair
- Staffing & Support Services, Los Altos
- Stamp Collecting & Coin Dealers , Los Altos
- State Government, Los Altos
- Stationery & Office Supplies, Los Altos
- Steak House Restaurants, Los Altos
- Stock & Bond Brokers & Dealers, Los Altos
- Stocks & Bond Brokers, Los Altos
- Stoves & Furnace Equipment, Los Altos - Fittings & Repair Parts
- Structural Engineer, Los Altos
- Student Housing & Services, Los Altos
- Sub-Zero Appliances Household Major, Los Altos
- Substance Abuse Clinics, Los Altos - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Surgical & Medical Instruments Manufacturers, Los Altos
- Surgical Supplies & Equipment, Los Altos
- Sushi Restaurants, Los Altos
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Los Altos
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