- Sand Gravel & Aggregate, Auburn
- Secondary Schools, Auburn
- Senior Citizens Housing, Auburn
- Senior Citizens Service & Health Organizations, Auburn
- Sheet Metal Contractors, Auburn - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Auburn
- Shopping & Shopping Services, Auburn
- Signs, Auburn
- Snacks & Desserts, Auburn
- Snow Removal Services, Auburn - Snow Plow Service
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- Social Services & Welfare, Auburn
- Societies & Foundation Associations, Auburn
- Specialty Animal Services, Auburn
- Specialty Stores, Auburn
- Sporting Goods Stores, Auburn
- Sports & Recreational Services, Auburn
- Sprinkler System Contractors, Auburn - Garden & Lawn Sprinkler System Installation & Repair
- Stoves & Furnace Equipment, Auburn - Fittings & Repair Parts
- Substance Abuse Clinics, Auburn - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Swimwear & Accessories Shops, Auburn - Water Sports Equipment
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