- Radiator Coolant & Solvents, Elburn - Engine Coolant
- Radiator Repair, Elburn - Gas Tank Repair
- Radiator Repair & Rebuild, Elburn
- Range & Oven Repair, Service & Sales, Elburn
- Ready Mix Concrete, Elburn - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Elburn
- Real Estate, Elburn - Agent, Broker & Companies
- Real Estate Services, Elburn
- Recording Studio Service - Sound & Video, Elburn
- Recycling Drop-Off Centers, Elburn
- Rehabilitation Centers, Products & Services, Elburn
- Rehabilitation Specialists, Elburn
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- Religious Organizations, Elburn
- Repair Services, Elburn
- Research Services, Elburn
- Residential Construction Contractors, Elburn - General Contractors
- Restaurant Management & Consulting, Elburn - Food Facilities Consultants
- Restaurants/Food & Dining, Elburn
- Retaining Wall Contractors, Elburn - Build & Repair - Blocks, Concrete, Stones, etc
- Riding & Rodeo Services, Elburn
- Roofing Consultants, Elburn - Roofing Companies
- Roofing Contractors, Elburn - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Elburn
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