- Racing Car Supplies, Willoughby
- Radiator Coolant & Solvents, Willoughby - Engine Coolant
- Radio & Television Repair Shops , Willoughby - TV Repair
- Radio Stations & Broadcasting Companies, Willoughby
- Radiology Equipment & Services, Willoughby - X-Ray Equipment & Supplies
- Real Estate, Willoughby - Agent, Broker & Companies
- Real Estate Appraiser, Willoughby - Appraisal Services
- Real Estate Appraisers & Consulting Services, Willoughby
- Real Estate Attorneys & Lawyers, Willoughby
- Real Estate Developers, Willoughby
- Real Estate Management, Willoughby
- Real Estate Properties, Willoughby
- Real Estate Rentals, Willoughby
- Real Estate Services, Willoughby
- Record Storage, Destruction & Management, Willoughby
- Recording Studio - Equipment & Rental, Willoughby
- Records, Tapes, CDs - Used & Vintage, Willoughby
- Recreational Services, Willoughby
- Recycling Drop-Off Centers, Willoughby
- Recycling Scrap & Waste Materials, Willoughby - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Willoughby
- Refrigerated Storage & Warehouse, Willoughby - Warehousing
- Refrigeration & Air Conditioning Contractors, Willoughby - Installation, Repair, Sales & Service
- Refrigeration & Cooling Equipment, Parts & Supplies , Willoughby - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Willoughby - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Willoughby - Fridge
- Rehabilitation Centers, Products & Services, Willoughby
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- Rehabilitation Specialists, Willoughby
- Religious Education, Willoughby
- Religious Organizations, Willoughby
- Rental & Leasing Business Equipment, Willoughby
- Repair Services, Willoughby
- Research & Development Bureaus, Willoughby - Commercial, Economic, Sociological & Educational Research
- Research Services, Willoughby
- Residential, Willoughby
- Residential Apartments, Willoughby
- Residential Care Facilities, Willoughby
- Residential Construction Contractors, Willoughby - General Contractors
- Residential Landfills, Willoughby
- Residential Real Estate - Rental & Leasing, Willoughby
- Resorts & Hotels, Willoughby
- Restaurant & Lounge, Bar, Or Pub, Willoughby
- Restaurant Equipment, Willoughby
- Restaurant Equipment & Supplies, Willoughby
- Restaurant Supplies & Equipment, Willoughby
- Restaurants - Breakfast Brunch Lunch, Willoughby
- Restaurants/Food & Dining, Willoughby
- Restoration Church, Willoughby
- Retail Book Stores, Willoughby
- Retirement Communities & Home, Assisted Living & Apartments, Willoughby
- Roadside Assistance, Road Service & Towing Service, Willoughby
- Roofing Consultants, Willoughby - Roofing Companies
- Roofing Contractors, Willoughby - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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