- Radiator Coolant & Solvents, Santa Rosa - Engine Coolant
- Radio Stations & Broadcasting Companies, Santa Rosa
- Railroad & Subway Construction Contractors, Santa Rosa
- Railroad Contractors, Santa Rosa
- Ready Mix Concrete, Santa Rosa - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Santa Rosa
- Real Estate, Santa Rosa - Agent, Broker & Companies
- Real Estate Services, Santa Rosa
- Religious Organizations, Santa Rosa
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- Repair Services, Santa Rosa
- Residential, Santa Rosa
- Residential Apartments, Santa Rosa
- Residential Care Facilities, Santa Rosa
- Restaurant & Lounge, Bar, Or Pub, Santa Rosa
- Restaurants/Food & Dining, Santa Rosa
- Roadside Assistance, Road Service & Towing Service, Santa Rosa
- Rv Parks, Santa Rosa
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