- Race Car Manufacturers, Oakland
- Racing Car Supplies, Oakland
- Racing Including Track Operations, Oakland
- Radiator Coolant & Solvents, Oakland - Engine Coolant
- Radiator Repair, Oakland - Gas Tank Repair
- Radio & Television Repair Shops , Oakland - TV Repair
- Radio Broadcasting Program Producers, Oakland
- Radio Communications Equipment & Systems , Oakland
- Radio Stations & Broadcast Companies, Oakland - Radio, Television & Publishers Representatives
- Radio Stations & Broadcasting Companies, Oakland
- Radiologists, Oakland - Radiology Doctors, Physicians & Surgeons
- Radiology Equipment & Services, Oakland - X-Ray Equipment & Supplies
- Radiotelephone Communications, Oakland
- Rail Line Travel Agents & Agencies, Oakland
- Railroad, Oakland - Commuter & Passenger Transport
- Railroad Companies, Oakland
- Reading Instruction Schools, Oakland
- Ready Mix Concrete, Oakland - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Oakland
- Real Estate, Oakland - Agent, Broker & Companies
- Real Estate Agencies, Oakland
- Real Estate Agent & Broker Services, Oakland
- Real Estate Agent - Property Lessors, Oakland
- Real Estate Appraiser, Oakland - Appraisal Services
- Real Estate Appraisers & Consulting Services, Oakland
- Real Estate Attorneys & Lawyers, Oakland
- Real Estate Attorneys & Lawyers, Oakland
- Real Estate Auctioneers, Oakland
- Real Estate Broker, Oakland
- Real Estate Consultants, Oakland
- Real Estate Developers, Oakland
- Real Estate Exchanges, Oakland
- Real Estate Investment Trusts, Oakland
- Real Estate Lawyers & Attorneys, Oakland
- Real Estate Maintenance Protection Plans, Oakland
- Real Estate Management, Oakland
- Real Estate Office Buildings Warehouses & Factories, Oakland
- Real Estate Properties, Oakland
- Real Estate Property Investment Properties, Oakland
- Real Estate Rentals, Oakland
- Real Estate Research Services, Oakland
- Real Estate Services, Oakland
- Record Labels, Oakland - Record Companies
- Record Storage, Destruction & Management, Oakland
- Recording Studio - Equipment & Rental, Oakland
- Recording Studio Equipment, Oakland
- Recording Studio Service - Sound & Video, Oakland
- Records Management Consultants, Oakland
- Records, Tapes, Cd & Dvd Manufacturers, Oakland
- Records, Tapes, CDs - Used & Vintage, Oakland
- Records, Tapes, Compact Discs Wholesale, Oakland
- Recreational Equipment & Supplies Companies, Oakland
- Recreational Good Manufacturers, Oakland
- Recreational Organizations, Oakland
- Recreational Services, Oakland
- Recycling Drop-Off Centers, Oakland
- Recycling Scrap & Waste Materials, Oakland - Scrap Metal, etc
- Reformed Churches, Oakland
- Refrigerated Storage & Warehouse, Oakland - Warehousing
- Refrigerated Truck, Oakland
- Refrigeration & Air Conditioning Contractors, Oakland - Installation, Repair, Sales & Service
- Refrigeration & Cooling Equipment, Parts & Supplies , Oakland - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Oakland - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Oakland - Fridge
- Refuse Collection & Disposal Services, Oakland
- Refuse Systems & Garbage Disposal, Oakland
- Rehabilitation Centers, Oakland
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- Rehabilitation Centers, Products & Services, Oakland
- Rehabilitation Specialists, Oakland
- Rehabilitational Job Training Services, Oakland
- Relief Organizations, Oakland
- Religious Education, Oakland
- Religious Goods & Church Supplies Stores, Oakland
- Religious Organizations, Oakland
- Religious Practitioners, Oakland
- Religious Science Churches, Oakland
- Religious Services, Oakland
- Relocation Services, Oakland
- Rental & Leasing Business Equipment, Oakland
- Repair Services, Oakland
- Repossession Services, Oakland
- Reprographic Services, Oakland
- Research & Development Bureaus, Oakland - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, Oakland - Laboratories
- Research Clinics, Oakland
- Research Film Laboratories & Film Services Motion Pictures, Oakland
- Research Services, Oakland
- Residential, Oakland
- Residential Apartments, Oakland
- Residential Architectural Designers, Oakland
- Residential Care Facilities, Oakland
- Residential Construction Contractors, Oakland - General Contractors
- Residential Landfills, Oakland
- Residential Real Estate Companies, Oakland
- Resorts & Hotels, Oakland
- Resource Centers, Oakland
- Respiratory Medical Services, Oakland
- Respiratory Therapy, Oakland
- Restaurant & Lounge, Bar, Or Pub, Oakland
- Restaurant Architects, Oakland
- Restaurant Equipment, Oakland
- Restaurant Equipment & Supplies, Oakland
- Restaurant Equipment Repair & Service, Oakland - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurant Management & Consulting, Oakland - Food Facilities Consultants
- Restaurant Supplies & Equipment, Oakland
- Restaurants - Breakfast Brunch Lunch, Oakland
- Restaurants/Food & Dining, Oakland
- Resume Service, Oakland
- Retail Book Stores, Oakland
- Retaining Wall Contractors, Oakland - Build & Repair - Blocks, Concrete, Stones, etc
- Retirement & Estate Planning, Oakland
- Retirement Communities & Home, Assisted Living & Apartments, Oakland
- Retirement Home Referral Service, Oakland - Nursing Home & Care Facilities Referrals & Information
- Retirement Homes, Oakland
- Ride Share Information, Oakland
- Riding & Rodeo Services, Oakland
- Riding Apparel & Equipment, Oakland
- Rigging Service & Crane Hoisting, Oakland
- Risk Management Consultants, Oakland
- Road Building Equipment & Machinery, Oakland
- Roadside Assistance, Road Service & Towing Service, Oakland
- Robots & Robotics System, Oakland
- Rock Shops, Oakland
- Roof Cleaning & Maintenance, Oakland - Roofing Services
- Roofing Consultants, Oakland - Roofing Companies
- Roofing Contractors, Oakland - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Contractors Referral Services, Oakland
- Roofing Materials & Supplies, Oakland
- Roofing Siding & Sheet Metal Referral Services, Oakland
- Rooming & Boarding Houses, Oakland
- Rubber Products - Retail, Oakland
- RV & Campers Repair & Service, Oakland
- Rv Parks, Oakland
- RV Repair, Oakland - Recreational Vehicle
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