- Sales & Marketing Consultant, Altadena
- Sandwich Shop Restaurants, Altadena
- Satellite & Cable TV Equipment & Systems, Altadena
- Satellite Descrambling & Programming Service, Altadena
- Satellite Dish Antennas & Equipment Dealers, Altadena
- Satellite TV Service, Altadena
- Savings & Loan Associations, Altadena
- Savings Banks, Altadena
- Scientific Services, Altadena
- Secondary Schools, Altadena
- Security Alarm Systems - Home & Business, Altadena
- Security Brokers & Dealers, Altadena
- Security Control Systems & Monitoring, Altadena - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Investigative Services, Altadena
- Security Services, Altadena
- Senior Citizen Counseling, Altadena
- Senior Citizens Centers & Meals, Altadena
- Sewer & Drain Cleaning & Repair, Altadena - Drain Cleaner & Installation Services
- Shopping & Shopping Services, Altadena
- Shopping Services, Altadena
- Siding Contractors, Altadena - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Sleep Disorders Treatment & Information Centers, Altadena
- Smog Check, Brake & Lamp Inspection & Repair, Altadena
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- Snacks & Desserts, Altadena
- Social Clubs & Organizations, Altadena
- Social Services & Welfare, Altadena
- Societies & Foundation Associations, Altadena
- Solar Energy Research Development & Design, Altadena
- Solar Equipment, Altadena
- Special Interest Schools Or Instruction, Altadena
- Specialty Animal Services, Altadena
- Specialty Stores, Altadena
- Sporting Goods Stores, Altadena
- Sports & Recreational Services, Altadena
- Staffing & Support Services, Altadena
- State Government, Altadena
- Steam Cleaner - Commercial & Industrial, Altadena - Steam Cleaning - Upholstery, Floor, Carpet, etc
- Steel & Metal Goods, Altadena - Steel Distributors
- Steel Manufacturers, Altadena
- Stucco Siding Contractors, Altadena - Stucco Repair & Installation
- Stucco Siding, Granite & Grouting Contractors, Altadena
- Substance Abuse Clinics, Altadena - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Swimming Pool, Sauna & Spa Contractors, Altadena
- Swimming Pools Contractors, Altadena - Install Inground - Above Ground Pools
- Swimming Pools Coping Plastering & Tiling, Altadena
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Altadena
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