- Radiator Coolant & Solvents, Marksville - Engine Coolant
- Radio & Tv Communications Equipment Manufacturers, Marksville
- Radio Stations & Broadcasting Companies, Marksville
- Ready Mix Concrete, Marksville - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Marksville
- Real Estate, Marksville - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Marksville
- Real Estate Rentals, Marksville
- Real Estate Services, Marksville
- Recycling Drop-Off Centers, Marksville
- Rehabilitation Centers, Products & Services, Marksville
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- Rehabilitation Specialists, Marksville
- Religious Education, Marksville
- Religious Organizations, Marksville
- Repair Services, Marksville
- Residential, Marksville
- Residential Apartments, Marksville
- Residential Care Facilities, Marksville
- Resorts & Hotels, Marksville
- Restaurant & Food Service Management Services, Marksville
- Restaurants/Food & Dining, Marksville
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