- Radiologists, Lemont - Radiology Doctors, Physicians & Surgeons
- Radiotelephone Communications, Lemont
- Railroad, Lemont - Commuter & Passenger Transport
- Railroad & Subway Construction Contractors, Lemont
- Railroad Contractors, Lemont
- Real Estate, Lemont - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Lemont
- Real Estate Agent Referral Services, Lemont
- Real Estate Appraiser, Lemont - Appraisal Services
- Real Estate Appraisers & Consulting Services, Lemont
- Real Estate Developers, Lemont
- Real Estate Management, Lemont
- Real Estate Referral & Information Services, Lemont
- Real Estate Services, Lemont
- Recreational Services, Lemont
- Recycling Scrap & Waste Materials, Lemont - Scrap Metal, etc
- Reformed Churches, Lemont
- Refrigerated Truck, Lemont
- Refrigeration & Cooling Equipment, Parts & Supplies , Lemont - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Lemont - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Lemont - Fridge
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- Rehabilitation Centers, Products & Services, Lemont
- Rehabilitation Specialists, Lemont
- Religious Education, Lemont
- Religious Organizations, Lemont
- Repair Services, Lemont
- Research & Development Bureaus, Lemont - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, Lemont - Laboratories
- Research Services, Lemont
- Residential, Lemont
- Residential Apartments, Lemont
- Residential Care Facilities, Lemont
- Residential Construction Contractors, Lemont - General Contractors
- Restaurant & Food Service Management Services, Lemont
- Restaurants/Food & Dining, Lemont
- Retirement Communities & Home, Assisted Living & Apartments, Lemont
- Retreat Facilities & Houses, Lemont
- Road Construction, Lemont - Companies & Contractors
- Road Construction & Repair Contractors, Lemont
- Roofing Consultants, Lemont - Roofing Companies
- Roofing Contractors, Lemont - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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