- Radiator Coolant & Solvents, Oakland - Engine Coolant
- Radio & Television Repair Shops , Oakland - TV Repair
- Radio Stations & Broadcasting Companies, Oakland
- Radon Testing & Services, Oakland
- Ready Mix Concrete, Oakland - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Oakland
- Real Estate, Oakland - Agent, Broker & Companies
- Real Estate Appraiser, Oakland - Appraisal Services
- Real Estate Appraisers & Consulting Services, Oakland
- Real Estate Developers, Oakland
- Real Estate Management, Oakland
- Real Estate Services, Oakland
- Record Storage, Destruction & Management, Oakland
- Recycling Drop-Off Centers, Oakland
- Rehabilitation Centers, Products & Services, Oakland
- Rehabilitation Specialists, Oakland
- Rehabilitational Job Training Services, Oakland
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- Relief Organizations, Oakland
- Religious Education, Oakland
- Religious Organizations, Oakland
- Repair Services, Oakland
- Residential, Oakland
- Residential Apartments, Oakland
- Residential Care Facilities, Oakland
- Residential Construction Contractors, Oakland - General Contractors
- Restaurants/Food & Dining, Oakland
- Retail Book Stores, Oakland
- Riding & Rodeo Services, Oakland
- Rigging Service & Crane Hoisting, Oakland
- Road Construction, Oakland - Companies & Contractors
- Road Construction & Repair Contractors, Oakland
- Roofing Consultants, Oakland - Roofing Companies
- Roofing Contractors, Oakland - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Oakland
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