- Sales & Marketing Consultant, National City
- Samoan Churches, National City
- Sand Gravel & Aggregate, National City
- Sandblasting, National City - General Contractors
- Sandwich Shop Restaurants, National City
- Satellite TV Service, National City
- Savings Banks, National City
- Scaffolding & Aerial Lifts, National City
- Scrap & Waste Materials, National City
- Screen Printing, National City
- Seafood Restaurants, National City
- Seals, National City - Hermetic, Hydraulic, Mechanical, Metal, Oil, Grease, etc
- Seals O Ring, National City
- Secondary Schools, National City
- Security Alarm Systems - Home & Business, National City
- Security Control Systems & Monitoring, National City - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, National City
- Senior Citizens Service & Health Organizations, National City
- Service Establishment Supplies & Equipment, National City
- Sewing & Yarn Stores & Supplies, National City
- Sewing Contractors, National City
- Sewing Machines, Equipment & Supplies, National City
- Sheet Metal, National City
- Sheet Metal Work - Aluminum, Tin, Stainless Steel, etc, National City - Sheet Metal Products
- Ship & Boat Building & Repairing, National City
- Shoe Dyers, National City
- Shoe Repair Shops, National City
- Shoe Store - More, National City
- Shoe Stores, National City - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, National City
- Shutters - Interior & Exterior, National City - Wood, Vinyl, Window, Plantation Shutters, etc
- Siding Materials, National City
- Sign Equipment & Supplies, National City
- Sign Products & Services, National City
- Sign Supplies & Sign Making Equipment, National City
- Signs, National City
- Skating Supplies, National City - Ice, Inline, Speed, Figure & Roller Skates
- Small Appliances, National City
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- Smog Check, Brake & Lamp Inspection & Repair, National City
- Smoothie Restaurants, National City
- Snacks & Desserts, National City
- Social Services & Welfare, National City
- Societies & Foundation Associations, National City
- Soda Fountain Shops, National City
- Special Education & Care, National City
- Special Events & Party Supply Rental, National City
- Special Interest Schools Or Instruction, National City
- Speciality Food Stores, National City
- Specialty Communication Companies & Services, National City
- Specialty Stores, National City
- Sporting Goods Stores, National City
- Sportswear Clothing Stores, National City - Sports Clothes
- Sprinkler Alarm Systems, National City - Fire Sprinkler Systems
- Staffing & Support Services, National City
- Stainless Steel, National City
- State Government, National City
- Stationery & Office Supplies, National City
- Steak House Restaurants, National City
- Steel & Metal Goods, National City - Steel Distributors
- Steel Manufacturers, National City
- Steel Mills & Blast Furnaces, National City
- Steel Springs Manufacturers Except Wire, National City
- Stereo, Audio & Video Equipment Dealers & Stores, National City
- Storage Trailers & Containers, National City
- Submarine Sandwich Restaurants, National City
- Substance Abuse Clinics, National City - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Sun Glasses & Sun Goggles Manufacturers, National City
- Sunglasses & Goggles, National City
- Support Services, National City
- Surfboard & Windsurfing Equipment Shops, National City
- Sushi Restaurants, National City
- Swimming Pool, Sauna & Spa Contractors, National City
- Swimming Pools Contractors, National City - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, National City
- Swimwear & Accessories Manufacturers, National City
- Swimwear & Accessories Shops, National City - Water Sports Equipment
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