- Racing Including Track Operations, Oakbrook Terrace
- Radio Broadcasting Consultants, Oakbrook Terrace
- Radio Equipment & Parts Stores & Dealers, Oakbrook Terrace
- Real Estate, Oakbrook Terrace - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Oakbrook Terrace
- Real Estate Agent - Property Lessors, Oakbrook Terrace
- Real Estate Broker, Oakbrook Terrace
- Real Estate Developers, Oakbrook Terrace
- Real Estate Management, Oakbrook Terrace
- Real Estate Rentals, Oakbrook Terrace
- Real Estate Services, Oakbrook Terrace
- Recycling Scrap & Waste Materials, Oakbrook Terrace - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Oakbrook Terrace
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- Religious Organizations, Oakbrook Terrace
- Religious Practitioners, Oakbrook Terrace
- Repair Services, Oakbrook Terrace
- Reprographic Services, Oakbrook Terrace
- Research Film Laboratories & Film Services Motion Pictures, Oakbrook Terrace
- Research Services, Oakbrook Terrace
- Residential, Oakbrook Terrace
- Residential Apartments, Oakbrook Terrace
- Residential Construction Contractors, Oakbrook Terrace - General Contractors
- Restaurant Management & Consulting, Oakbrook Terrace - Food Facilities Consultants
- Restaurants/Food & Dining, Oakbrook Terrace
- Roofing Consultants, Oakbrook Terrace - Roofing Companies
- Roofing Contractors, Oakbrook Terrace - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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