- Racing Including Track Operations, South Beloit
- Radiator Coolant & Solvents, South Beloit - Engine Coolant
- Radiator Repair, South Beloit - Gas Tank Repair
- Radiator Repair & Rebuild, South Beloit
- Radio Stations & Broadcasting Companies, South Beloit
- Railroad, South Beloit - Commuter & Passenger Transport
- Railroad & Subway Construction Contractors, South Beloit
- Railroad Companies, South Beloit
- Railroad Contractors, South Beloit
- Railroad Repair & Maintenance, South Beloit
- Real Estate, South Beloit - Agent, Broker & Companies
- Real Estate Rentals, South Beloit
- Real Estate Services, South Beloit
- Recreational Good Manufacturers, South Beloit
- Recreational Services, South Beloit
- Recycling Drop-Off Centers, South Beloit
- Recycling Scrap & Waste Materials, South Beloit - Scrap Metal, etc
- Refrigeration & Cooling Equipment, Parts & Supplies , South Beloit - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, South Beloit - Ac, Freezer, Refrigerator Repair
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- Rehabilitation Centers, Products & Services, South Beloit
- Rehabilitation Specialists, South Beloit
- Religious Education, South Beloit
- Religious Organizations, South Beloit
- Religious Practitioners, South Beloit
- Repair Services, South Beloit
- Residential, South Beloit
- Residential Architect, South Beloit
- Residential Care Facilities, South Beloit
- Residential Construction Contractors, South Beloit - General Contractors
- Restaurant Equipment, South Beloit
- Restaurant Equipment & Supplies, South Beloit
- Restaurant Supplies & Equipment, South Beloit
- Restaurants/Food & Dining, South Beloit
- Riding & Rodeo Services, South Beloit
- Roadside Assistance, Road Service & Towing Service, South Beloit
- Roofing Consultants, South Beloit - Roofing Companies
- Roofing Contractors, South Beloit - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rv Parks, South Beloit
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