- Racing Car Supplies, Louisville
- Railroad Ties, Louisville
- Real Estate, Louisville - Agent, Broker & Companies
- Real Estate Developers, Louisville
- Real Estate Management, Louisville
- Real Estate Services, Louisville
- Record Storage, Destruction & Management, Louisville
- Recreational Organizations, Louisville
- Refrigerated Truck, Louisville
- Refrigerator & Freezer Equipment, Parts & Supplies, Louisville
- Refrigerator Sales, Service & Repair, Louisville - Fridge
- Religious Organizations, Louisville
- Repair Services, Louisville
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- Research & Development Bureaus, Louisville - Commercial, Economic, Sociological & Educational Research
- Research Services, Louisville
- Residential, Louisville
- Residential Apartments, Louisville
- Residential Care Facilities, Louisville
- Restaurants/Food & Dining, Louisville
- Rifle & Pistol Ranges, Louisville
- Roadside Assistance, Road Service & Towing Service, Louisville
- Roofing Consultants, Louisville - Roofing Companies
- Roofing Contractors, Louisville - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Louisville
- RV & Campers Repair & Service, Louisville
- RV Repair, Louisville - Recreational Vehicle
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