- Racing Apparel & Collectibles, Janesville
- Racing Car Supplies, Janesville
- Radiator Coolant & Solvents, Janesville - Engine Coolant
- Radiators Heating, Janesville
- Radio & Television Repair Shops , Janesville - TV Repair
- Radio Communications Equipment & Systems , Janesville
- Radio Stations & Broadcasting Companies, Janesville
- Radiotelephone Communications, Janesville
- Rail Line Travel Agents & Agencies, Janesville
- Railroad, Janesville - Commuter & Passenger Transport
- Railroad & Subway Construction Contractors, Janesville
- Railroad Companies, Janesville
- Railroad Contractors, Janesville
- Reading Instruction Schools, Janesville
- Ready Mix Concrete, Janesville - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Janesville
- Real Estate, Janesville - Agent, Broker & Companies
- Real Estate Appraiser, Janesville - Appraisal Services
- Real Estate Appraisers & Consulting Services, Janesville
- Real Estate Auctioneers, Janesville
- Real Estate Consultants, Janesville
- Real Estate Developers, Janesville
- Real Estate Management, Janesville
- Real Estate Services, Janesville
- Record Storage, Destruction & Management, Janesville
- Records, Tapes, CDs - Used & Vintage, Janesville
- Recycling & Sanitation Consultants, Janesville
- Recycling Drop-Off Centers, Janesville
- Recycling Scrap & Waste Materials, Janesville - Scrap Metal, etc
- Red Wing Shoes, Janesville
- Reducing Exercise & Weight Control Services, Janesville
- Reflexologists, Janesville
- Refrigeration Repair & Service, Janesville - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Janesville - Fridge
- Refuse Collection & Disposal Services, Janesville
- Refuse Systems & Garbage Disposal, Janesville
- Rehabilitation Centers, Janesville
- Rehabilitation Centers, Products & Services, Janesville
- Rehabilitation Specialists, Janesville
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- Rehabilitational Job Training Services, Janesville
- Relaxation Clinics, Janesville
- Relief Organizations, Janesville
- Religious Organizations, Janesville
- Religious Practitioners, Janesville
- Relocation Services, Janesville
- Repair Services, Janesville
- Research & Development Bureaus, Janesville - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, Janesville - Laboratories
- Research Services, Janesville
- Residential, Janesville
- Residential Apartments, Janesville
- Residential Architect, Janesville
- Residential Care Facilities, Janesville
- Residential Construction Contractors, Janesville - General Contractors
- Residential Real Estate Companies, Janesville
- Resins Wholesale & Retail, Janesville - Plastic Raw Materials
- Restaurant & Food Service Management Services, Janesville
- Restaurant & Lounge, Bar, Or Pub, Janesville
- Restaurant Management & Consulting, Janesville - Food Facilities Consultants
- Restaurants/Food & Dining, Janesville
- Retail Book Stores, Janesville
- Retirement Communities & Home, Assisted Living & Apartments, Janesville
- Rheumatologists, Janesville - Rheumatology Doctors, Physicians & Surgeons
- Rigging Service & Crane Hoisting, Janesville
- Roadside Assistance, Road Service & Towing Service, Janesville
- Roofing Consultants, Janesville - Roofing Companies
- Roofing Contractors, Janesville - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Janesville
- Rubber & Plastic Products, Janesville
- Rubber Products, Janesville
- Rubber Products - Manufacturers, Janesville
- Rubber Products - Retail, Janesville
- Rubber Stamps, Janesville
- RV & Campers Repair & Service, Janesville
- Rv Parks, Janesville
- RV Repair, Janesville - Recreational Vehicle
- Ryder Truck Rental , Janesville - Ryder Moving
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