- Radio Stations & Broadcasting Companies, Oroville
- Railroad, Oroville - Commuter & Passenger Transport
- Railroad Cars Manufacturers, Oroville
- Railroad Companies, Oroville
- Railroad Equipment & Supplies Manufacturers, Oroville
- Railroad Loading & Unloading, Oroville
- Railroad Services, Oroville
- Real Estate, Oroville - Agent, Broker & Companies
- Real Estate & Insurance Schools, Oroville
- Real Estate Appraisers & Consulting Services, Oroville
- Real Estate Consultants, Oroville
- Real Estate Developers, Oroville
- Real Estate Rentals, Oroville
- Real Estate Services, Oroville
- Rehabilitation Centers, Products & Services, Oroville
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- Rehabilitation Specialists, Oroville
- Religious Organizations, Oroville
- Religious Practitioners, Oroville
- Repair Services, Oroville
- Research & Development Labs, Oroville - Laboratories
- Research Services, Oroville
- Residential, Oroville
- Residential Apartments, Oroville
- Residential Architect, Oroville
- Resorts & Hotels, Oroville
- Restaurant & Lounge, Bar, Or Pub, Oroville
- Restaurants/Food & Dining, Oroville
- Retail Book Stores, Oroville
- Rv Parks, Oroville
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