- Radiator Coolant & Solvents, Wahpeton - Engine Coolant
- Radio & Television Repair Shops , Wahpeton - TV Repair
- Radio Communications Equipment & Systems , Wahpeton
- Radio Stations & Broadcasting Companies, Wahpeton
- Railroad Companies, Wahpeton
- Ready Mix Concrete, Wahpeton - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Wahpeton
- Real Estate, Wahpeton - Agent, Broker & Companies
- Real Estate Properties, Wahpeton
- Real Estate Recreational & Resort, Wahpeton
- Real Estate Services, Wahpeton
- Record Storage, Destruction & Management, Wahpeton
- Recycling Drop-Off Centers, Wahpeton
- Refrigeration & Air Conditioning Contractors, Wahpeton - Installation, Repair, Sales & Service
- Rehabilitational Job Training Services, Wahpeton
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- Religious Organizations, Wahpeton
- Repair Services, Wahpeton
- Research & Development Bureaus, Wahpeton - Commercial, Economic, Sociological & Educational Research
- Research Services, Wahpeton
- Residential, Wahpeton
- Residential Apartments, Wahpeton
- Residential Care Facilities, Wahpeton
- Residential Construction Contractors, Wahpeton - General Contractors
- Restaurants/Food & Dining, Wahpeton
- Retirement Communities & Home, Assisted Living & Apartments, Wahpeton
- Rigging Equipment & Supplies, Wahpeton
- Rigging Service & Crane Hoisting, Wahpeton
- Robots & Robotics System, Wahpeton
- Roofing Consultants, Wahpeton - Roofing Companies
- Roofing Contractors, Wahpeton - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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