- Racing Including Track Operations, Oroville
- Radiator Coolant & Solvents, Oroville - Engine Coolant
- Radiator Repair, Oroville - Gas Tank Repair
- Radio & Television Repair Shops , Oroville - TV Repair
- Radio Stations & Broadcasting Companies, Oroville
- Ready Mix Concrete, Oroville - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Oroville
- Real Estate, Oroville - Agent, Broker & Companies
- Real Estate Agencies, Oroville
- Real Estate Agent - Property Lessors, Oroville
- Real Estate Appraiser, Oroville - Appraisal Services
- Real Estate Appraisers & Consulting Services, Oroville
- Real Estate Consultants, Oroville
- Real Estate Developers, Oroville
- Real Estate Farms & Ranches, Oroville
- Real Estate Management, Oroville
- Real Estate Properties, Oroville
- Real Estate Referral & Information Services, Oroville
- Real Estate Rentals, Oroville
- Real Estate Services, Oroville
- Recycling Drop-Off Centers, Oroville
- Recycling Scrap & Waste Materials, Oroville - Scrap Metal, etc
- Refrigeration & Cooling Equipment, Parts & Supplies , Oroville - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Oroville - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Oroville - Fridge
- Refuse Collection & Disposal Services, Oroville
- Rehabilitation Centers, Products & Services, Oroville
- Rehabilitation Specialists, Oroville
- Rehabilitational Job Training Services, Oroville
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- Religious Education, Oroville
- Religious Organizations, Oroville
- Religious Science Churches, Oroville
- Religious Services, Oroville
- Rental & Leasing Business Equipment, Oroville
- Rental Property Management, Oroville
- Repair Services, Oroville
- Residential, Oroville
- Residential Apartments, Oroville
- Residential Care Facilities, Oroville
- Restaurant Equipment Repair & Service, Oroville - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurants - Breakfast Brunch Lunch, Oroville
- Restaurants/Food & Dining, Oroville
- Retail Book Stores, Oroville
- Retirement Communities & Home, Assisted Living & Apartments, Oroville
- Rice Products, Oroville
- Riding & Rodeo Services, Oroville
- Road Construction, Oroville - Companies & Contractors
- Road Construction & Repair Contractors, Oroville
- Roadside Assistance, Road Service & Towing Service, Oroville
- Rock Shops, Oroville
- Roofing & Siding Materials, Equipments & Supplies, Oroville - Wholesale, Manufacturers & Suppliers
- Roofing Consultants, Oroville - Roofing Companies
- Roofing Contractors, Oroville - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Oroville
- RV & Campers Repair & Service, Oroville
- Rv Parks, Oroville
- RV Repair, Oroville - Recreational Vehicle
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