- Safe & Vault, Northridge
- Safe, Lock & Key Repair Services, Northridge - Safes & Vaults Opening & Repair
- Safety & Security Systems & Consultants, Northridge
- Safety Equipment & Supplies, Northridge
- Sales & Marketing Consultant, Northridge
- Salvage Yards, Junk Yards & Wrecker Service, Northridge
- Sand Gravel & Aggregate, Northridge
- Sandwich Shop Restaurants, Northridge
- Satellite Communication Downlinking & Uplinking, Northridge
- Satellite TV Service, Northridge
- Savings & Loan Associations, Northridge
- Savings Banks, Northridge
- Sawmill, Paper & Woodworking Supplies, Machinery & Equipment, Northridge
- Scaffolding & Aerial Lifts, Northridge
- School - Catholic, Northridge
- School - Christian, Northridge
- Scientific & Laboratory Equipment & Instruments, Northridge
- Scrap & Waste Materials, Northridge
- Scrapbooks & Scrapbook Supplies, Northridge
- Screen Houses, Northridge
- Screen Printing, Northridge
- Screens Doors & Windows, Northridge
- Seafood Restaurants, Northridge
- Search & Navigation Equipment Manufacturers, Northridge
- Secondary Schools, Northridge
- Secretarial & Court Reporting Services, Northridge
- Security & Commodity Brokers, Northridge
- Security & Surveillance System & Equipment, Northridge
- Security Alarm Systems - Home & Business, Northridge
- Security Brokers & Dealers, Northridge
- Security Consultants, Northridge
- Security Control Systems & Monitoring, Northridge - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Guard & Patrol Service, Northridge - Bodyguard, Guard Dogs, Etc
- Security Investigative Services, Northridge
- Security Services, Northridge
- Sedation Dentistry, Northridge
- Self Defense Programs, Northridge
- Senior Citizens Housing, Northridge
- Senior Citizens Service & Health Organizations, Northridge
- Septic Tank Installation & Repair, Northridge - Septic Systems
- Septic Tank Pumping & Cleaning, Northridge - Septic Systems
- Septic Tanks & Septic Systems Contractors, Northridge - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Service Establishment Supplies & Equipment, Northridge
- Sewer & Drain Cleaning & Repair, Northridge - Drain Cleaner & Installation Services
- Sewer Construction Contractors, Northridge - Sewer Line, Pipe Installation & Repair Services
- Sewing & Yarn Stores & Supplies, Northridge
- Sewing Machine Repair & Service, Northridge
- Shaved Ice, Northridge
- Sheet Metal Contractors, Northridge - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Northridge
- Ship & Boat Building & Repairing, Northridge
- Shipping Companies, Northridge
- Shirts & T-Shirts, Northridge
- Shoe Dyers, Northridge
- Shoe Repair Shops, Northridge
- Shoe Store - More, Northridge
- Shoe Stores, Northridge - Mens, Womens & Kids Shoes
- Shooting & Target Ranges, Northridge
- Shopping & Shopping Services, Northridge
- Shutters - Interior & Exterior, Northridge - Wood, Vinyl, Window, Plantation Shutters, etc
- Sidewalk Cafes, Northridge
- Siding Contractors, Northridge - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Northridge
- Skateboards & Equipment Shops, Northridge - Skateboarding Supplies
- Skin Care & Cosmetology Salons, Northridge
- Skin Care Products & Treatments, Northridge
- Sleep Disorders Treatment & Information Centers, Northridge
- Sleep Doctors, Northridge - Specialists, Physicians & Surgeons (Sleep Medicine)
- Small Appliances, Northridge
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- Small Business & Office Equipment Repair Services, Northridge
- Smog Check, Brake & Lamp Inspection & Repair, Northridge
- Smoothie Restaurants, Northridge
- Snack Foods, Northridge
- Snacks & Desserts, Northridge
- Snow Cone Stands, Northridge
- Social & Human Services Autism Services, Northridge
- Social Security And Disability Attorneys & Lawyers, Northridge
- Social Security And Disability Lawyers & Attorneys, Northridge
- Social Service Organizations Volunteer Services, Northridge
- Social Services & Welfare, Northridge
- Societies & Foundation Associations, Northridge
- Soil & Foundation Engineer, Northridge
- Solar Equipment, Northridge
- Solar Products & Services, Northridge
- Sororities, Northridge
- South American Restaurants, Northridge
- Spare Rib Restaurants, Northridge
- Special Coatings, Northridge - Protective Coatings
- Special Education & Care, Northridge
- Special Events & Party Supply Rental, Northridge
- Special Events Photographers, Northridge
- Special Interest Schools Or Instruction, Northridge
- Speciality Food Stores, Northridge
- Specialty Animal Services, Northridge
- Specialty Communication Companies & Services, Northridge
- Specialty Rental Services, Northridge
- Specialty Stores, Northridge
- Speech & Hearing Specialists, Northridge
- Speech Pathologists, Northridge - Speech & Language Therapy
- Sporting Goods Stores, Northridge
- Sports Bars & Lounges, Northridge
- Sportswear Clothing Stores, Northridge - Sports Clothes
- Sprinkler Alarm Systems, Northridge - Fire Sprinkler Systems
- Sprinkler System Contractors, Northridge - Garden & Lawn Sprinkler System Installation & Repair
- Staffing & Support Services, Northridge
- Stairs & Railings Contractors, Northridge - Metal & Wood Stairs, Spiral Staircase & Stair Railing - Installation & Repair
- Stairs, Balcony, Terrace & Steeple Contractors, Northridge
- Stamp Collecting & Coin Dealers , Northridge
- State Government, Northridge
- Stationery & Office Supplies, Northridge
- Steak House Restaurants, Northridge
- Steamship Companies & Agencies, Northridge
- Steel & Metal Goods, Northridge - Steel Distributors
- Steel Manufacturers, Northridge
- Stereo, Audio & Video Equipment Dealers & Stores, Northridge
- Stock & Bond Brokers & Dealers, Northridge
- Stocks & Bond Brokers, Northridge
- Stone And Glass Products, Northridge
- Storage & Closet Equipment Supplies & Materials, Northridge
- Stoves & Furnace Equipment, Northridge - Fittings & Repair Parts
- Structural Engineer, Northridge
- Student Housing & Services, Northridge
- Submarine Sandwich Restaurants, Northridge
- Support Services, Northridge
- Surgical Hospitals, Northridge - Surgical Centers
- Surplus & Salvage Merchandise, Northridge
- Surveying Engineer, Northridge
- Surveyor Services, Northridge - Surveying Service
- Sushi Restaurants, Northridge
- Swimming Lessons & Classes, Northridge
- Swimming Pool Designing & Consulting, Northridge
- Swimming Pool, Sauna & Spa Contractors, Northridge
- Swimming Pools Contractors, Northridge - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Northridge
- Swimming Pools Supplies, Equipment & Accessories, Northridge
- Swimwear & Accessories Shops, Northridge - Water Sports Equipment
- Synagogues & Temples, Northridge
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