- Radio Stations & Broadcasting Companies, Colusa
- Railroad & Subway Construction Contractors, Colusa
- Railroad Contractors, Colusa
- Real Estate, Colusa - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Colusa
- Real Estate Appraiser, Colusa - Appraisal Services
- Real Estate Appraisers & Consulting Services, Colusa
- Real Estate Broker, Colusa
- Real Estate Consultants, Colusa
- Real Estate Services, Colusa
- Recreational Equipment Repair & Service, Colusa
- Recycling Drop-Off Centers, Colusa
- Refrigerator Sales, Service & Repair, Colusa - Fridge
- Rehabilitation Centers, Products & Services, Colusa
- Rehabilitation Specialists, Colusa
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- Rehabilitational Job Training Services, Colusa
- Religious Education, Colusa
- Religious Organizations, Colusa
- Religious Practitioners, Colusa
- Rental & Leasing Business Equipment, Colusa
- Repair Services, Colusa
- Research Services, Colusa
- Residential, Colusa
- Residential Apartments, Colusa
- Residential Construction Contractors, Colusa - General Contractors
- Restaurants - Breakfast Brunch Lunch, Colusa
- Restaurants/Food & Dining, Colusa
- Resume Service, Colusa
- Rice Products, Colusa
- Rv Parks, Colusa
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