- Sand Gravel & Aggregate, Oakland
- Sandwich Shop Restaurants, Oakland
- Satellite Dish Antennas & Equipment Dealers, Oakland
- Secondary Schools, Oakland
- Security Brokers & Dealers, Oakland
- Shoe Stores, Oakland - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Oakland
- Social Services & Welfare, Oakland
- Sod & Sodding Service, Oakland
- Sod Farms, Oakland
- Special Interest Schools Or Instruction, Oakland
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- Specialty Stores, Oakland
- Sporting Goods Stores, Oakland
- State Government, Oakland
- Steak House Restaurants, Oakland
- Steel & Metal Goods, Oakland - Steel Distributors
- Stocks & Bond Brokers, Oakland
- Stucco Siding Contractors, Oakland - Stucco Repair & Installation
- Stucco Siding, Granite & Grouting Contractors, Oakland
- Submarine Sandwich Restaurants, Oakland
- Surveyor Services, Oakland - Surveying Service
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Oakland
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