- Race Car Dealers, Naperville
- Racing Car Supplies, Naperville
- Radiator Repair, Naperville - Gas Tank Repair
- Radio & Television Repair Shops , Naperville - TV Repair
- Radio Broadcasting Consultants, Naperville
- Radio Stations & Broadcasting Companies, Naperville
- Radiologists, Naperville - Radiology Doctors, Physicians & Surgeons
- Radiology Equipment & Services, Naperville - X-Ray Equipment & Supplies
- Radiotelephone Communications, Naperville
- Radon Testing & Services, Naperville
- Railroad, Naperville - Commuter & Passenger Transport
- Railroad Companies, Naperville
- Ready Mix Concrete, Naperville - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Naperville
- Real Estate, Naperville - Agent, Broker & Companies
- Real Estate Agencies, Naperville
- Real Estate Agent & Broker Services, Naperville
- Real Estate Agent - Property Lessors, Naperville
- Real Estate Appraiser, Naperville - Appraisal Services
- Real Estate Appraisers & Consulting Services, Naperville
- Real Estate Attorneys & Lawyers, Naperville
- Real Estate Attorneys & Lawyers, Naperville
- Real Estate Broker, Naperville
- Real Estate Consultants, Naperville
- Real Estate Developers, Naperville
- Real Estate Lawyers & Attorneys, Naperville
- Real Estate Management, Naperville
- Real Estate Referral & Information Services, Naperville
- Real Estate Rentals, Naperville
- Real Estate Services, Naperville
- Reconstructionist Synagogues, Naperville
- Recording Studio Service - Sound & Video, Naperville
- Records, Tapes, CDs - Used & Vintage, Naperville
- Recreational Equipment & Supplies Companies, Naperville
- Recreational Good Manufacturers, Naperville
- Recreational Services, Naperville
- Recycling & Sanitation Consultants, Naperville
- Recycling Drop-Off Centers, Naperville
- Recycling Scrap & Waste Materials, Naperville - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Naperville
- Refrigeration & Cooling Equipment, Parts & Supplies , Naperville - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Naperville - Ac, Freezer, Refrigerator Repair
- Refuse Collection & Disposal, Naperville
- Refuse Collection & Disposal Services, Naperville
- Refuse Systems & Garbage Disposal, Naperville
- Rehabilitation Centers, Products & Services, Naperville
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- Rehabilitation Specialists, Naperville
- Religious Education, Naperville
- Religious Goods & Church Supplies Stores, Naperville
- Religious Organizations, Naperville
- Religious Practitioners, Naperville
- Religious Science Churches, Naperville
- Relocation Services, Naperville
- Rental & Leasing Business Equipment, Naperville
- Repair Services, Naperville
- Research & Development Bureaus, Naperville - Commercial, Economic, Sociological & Educational Research
- Research Film Laboratories & Film Services Motion Pictures, Naperville
- Research Service Libraries, Naperville
- Research Services, Naperville
- Residential, Naperville
- Residential Apartments, Naperville
- Residential Architect, Naperville
- Residential Care Facilities, Naperville
- Residential Construction Contractors, Naperville - General Contractors
- Residential Electricians, Naperville - Electric Contractors
- Resource Centers, Naperville
- Restaurant & Food Service Management Services, Naperville
- Restaurant & Lounge, Bar, Or Pub, Naperville
- Restaurant Equipment, Naperville
- Restaurant Equipment & Supplies, Naperville
- Restaurant Management & Consulting, Naperville - Food Facilities Consultants
- Restaurant Supplies & Equipment, Naperville
- Restaurants - Breakfast Brunch Lunch, Naperville
- Restaurants/Food & Dining, Naperville
- Resume Service, Naperville
- Retail Book Stores, Naperville
- Retirement & Estate Planning, Naperville
- Retirement Communities & Home, Assisted Living & Apartments, Naperville
- Retirement Homes, Naperville
- Retirement Planning Consultants & Services, Naperville
- Rheem / Rudd Heating & Air Conditioning Contractors, Naperville - Air Conditioner Contractors & Systems
- Rheumatologists, Naperville - Rheumatology Doctors, Physicians & Surgeons
- Rigging Service & Crane Hoisting, Naperville
- Roadside Assistance, Road Service & Towing Service, Naperville
- Roofing Consultants, Naperville - Roofing Companies
- Roofing Contractors, Naperville - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Naperville
- Rubber Products, Naperville
- Rubber Products - Retail, Naperville
- Rvs Sales, Rental & Leasing, Naperville
- Ryder Truck Rental , Naperville - Ryder Moving
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