- Radio Communications Equipment & Systems , Janesville
- Radiotelephone Communications, Janesville
- Railroad Companies, Janesville
- Real Estate, Janesville - Agent, Broker & Companies
- Real Estate Services, Janesville
- Recycling Drop-Off Centers, Janesville
- Recycling Scrap & Waste Materials, Janesville - Scrap Metal, etc
- Religious Education, Janesville
- Religious Organizations, Janesville
- Repair Services, Janesville
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- Research Services, Janesville
- Residential, Janesville
- Residential Apartments, Janesville
- Residential Care Facilities, Janesville
- Residential Construction Contractors, Janesville - General Contractors
- Restaurants/Food & Dining, Janesville
- Retirement Communities & Home, Assisted Living & Apartments, Janesville
- Retreat Facilities & Houses, Janesville
- Rods, Springs & Suspension Equipment & Supplies, Janesville
- Rv Parks, Janesville
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