- Radiator Coolant & Solvents, Ironwood - Engine Coolant
- Radio & Television Repair Shops , Ironwood - TV Repair
- Radio Stations & Broadcasting Companies, Ironwood
- Railroad Companies, Ironwood
- Rape Treatment Centers, Ironwood
- Ready Mix Concrete, Ironwood - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Ironwood
- Real Estate, Ironwood - Agent, Broker & Companies
- Real Estate Appraiser, Ironwood - Appraisal Services
- Real Estate Appraisers & Consulting Services, Ironwood
- Real Estate Management, Ironwood
- Real Estate Services, Ironwood
- Recreational Equipment Repair & Service, Ironwood
- Rehabilitation Centers, Products & Services, Ironwood
- Rehabilitation Specialists, Ironwood
- Rehabilitational Job Training Services, Ironwood
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- Religious Education, Ironwood
- Religious Organizations, Ironwood
- Rental & Leasing Business Equipment, Ironwood
- Repair Services, Ironwood
- Research & Development Bureaus, Ironwood - Commercial, Economic, Sociological & Educational Research
- Research Services, Ironwood
- Residential, Ironwood
- Residential Apartments, Ironwood
- Residential Care Facilities, Ironwood
- Residential Construction Contractors, Ironwood - General Contractors
- Resorts & Hotels, Ironwood
- Restaurants/Food & Dining, Ironwood
- Retail Book Stores, Ironwood
- Roofing Consultants, Ironwood - Roofing Companies
- Roofing Contractors, Ironwood - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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