- Radio & Tv Communications Equipment Manufacturers, Dayton
- Railroad Companies, Dayton
- Ready Mix Concrete, Dayton - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Dayton
- Real Estate, Dayton - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Dayton
- Real Estate Developers, Dayton
- Real Estate Inspectors, Dayton - Real Estate Inspection Service
- Real Estate Services, Dayton
- Recycling Drop-Off Centers, Dayton
- Recycling Scrap & Waste Materials, Dayton - Scrap Metal, etc
- Refrigeration & Air Conditioning Contractors, Dayton - Installation, Repair, Sales & Service
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- Religious Organizations, Dayton
- Repair Services, Dayton
- Research Services, Dayton
- Residential, Dayton
- Residential Apartments, Dayton
- Residential Construction Contractors, Dayton - General Contractors
- Restaurants - Breakfast Brunch Lunch, Dayton
- Restaurants/Food & Dining, Dayton
- Rice Products, Dayton
- Roofing Materials & Supplies, Dayton
- Rv Parks, Dayton
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