- Radiotelephone Communications, Oak Forest
- Railroad, Oak Forest - Commuter & Passenger Transport
- Ready Mix Concrete, Oak Forest - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Oak Forest
- Real Estate, Oak Forest - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Oak Forest
- Real Estate Agent - Property Lessors, Oak Forest
- Real Estate Appraiser, Oak Forest - Appraisal Services
- Real Estate Appraisers & Consulting Services, Oak Forest
- Real Estate Broker, Oak Forest
- Real Estate Management, Oak Forest
- Real Estate Services, Oak Forest
- Reformed Churches, Oak Forest
- Rehabilitation Centers, Products & Services, Oak Forest
- Rehabilitation Specialists, Oak Forest
- Religious Goods & Church Supplies Stores, Oak Forest
- Religious Organizations, Oak Forest
- Repair Services, Oak Forest
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- Research & Development Bureaus, Oak Forest - Commercial, Economic, Sociological & Educational Research
- Research Services, Oak Forest
- Residential, Oak Forest
- Residential Apartments, Oak Forest
- Residential Care Facilities, Oak Forest
- Residential Construction Contractors, Oak Forest - General Contractors
- Restaurant & Lounge, Bar, Or Pub, Oak Forest
- Restaurant Equipment, Oak Forest
- Restaurant Equipment & Supplies, Oak Forest
- Restaurant Supplies & Equipment, Oak Forest
- Restaurants - Breakfast Brunch Lunch, Oak Forest
- Restaurants/Food & Dining, Oak Forest
- Roofing Consultants, Oak Forest - Roofing Companies
- Roofing Contractors, Oak Forest - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Oak Forest
- Rv Parks, Oak Forest
- Ryder Truck Rental , Oak Forest - Ryder Moving
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