- Radiotelephone Communications, Round Lake
- Railroad, Round Lake - Commuter & Passenger Transport
- Railroad Companies, Round Lake
- Real Estate, Round Lake - Agent, Broker & Companies
- Real Estate Developers, Round Lake
- Real Estate Services, Round Lake
- Religious Organizations, Round Lake
- Repair Services, Round Lake
- Residential, Round Lake
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- Residential Apartments, Round Lake
- Residential Construction Contractors, Round Lake - General Contractors
- Restaurant & Food Service Management Services, Round Lake
- Restaurants/Food & Dining, Round Lake
- Riding & Rodeo Services, Round Lake
- Road Construction, Round Lake - Companies & Contractors
- Road Construction & Repair Contractors, Round Lake
- Roofing Contractors, Round Lake - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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