- Sandwich Shop Restaurants, Oakland
- Sawdust & Shavings, Oakland
- Sawmill & Planing Mills, Oakland
- Sawmill Supplies & Equipment Repair, Oakland
- Scientific Equipment & Services, Oakland
- Scientific Services, Oakland
- Scrap & Waste Materials, Oakland
- Screen Printing, Oakland
- Secretarial & Court Reporting Services, Oakland
- Security Brokers & Dealers, Oakland
- Septic Tank Pumping & Cleaning, Oakland - Septic Systems
- Septic Tanks & Systems, Oakland - Wholesale, Dealers & Suppliers
- Sewer & Drain Cleaning & Repair, Oakland - Drain Cleaner & Installation Services
- Sheet Metal, Oakland
- Sheet Metal Contractors, Oakland - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Oakland
- Shopping & Shopping Services, Oakland
- Siding Contractors, Oakland - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
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- Signs, Oakland
- Skin Care & Cosmetology Salons, Oakland
- Skin Care Products & Treatments, Oakland
- Snack Foods, Oakland
- Social Services & Welfare, Oakland
- Social Workers & Services, Oakland
- Sod & Sodding Service, Oakland
- Specialty Stores, Oakland
- Sporting & Recreational Camps, Oakland
- Sporting Goods Equipment Rental, Oakland
- Sporting Goods Stores, Oakland
- Staffing & Support Services, Oakland
- Stenographic Services, Oakland
- Stocks & Bond Brokers, Oakland
- Surveyor Services, Oakland - Surveying Service
- Swimming Pool, Sauna & Spa Contractors, Oakland
- Swimming Pools Contractors, Oakland - Install Inground - Above Ground Pools
- Swimming Pools Supplies, Equipment & Accessories, Oakland
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