- Racing Car Supplies, Twinsburg
- Radiator Coolant & Solvents, Twinsburg - Engine Coolant
- Radio & Television Repair Shops , Twinsburg - TV Repair
- Radio & Tv Communications Equipment Manufacturers, Twinsburg
- Radio Stations & Broadcasting Companies, Twinsburg
- Radioactivity Detection Devices, Twinsburg
- Radiology Equipment & Services, Twinsburg - X-Ray Equipment & Supplies
- Radon Testing & Services, Twinsburg
- Railroad Companies, Twinsburg
- Range & Oven Repair, Service & Sales, Twinsburg
- Ready Mix Concrete, Twinsburg - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Twinsburg
- Real Estate, Twinsburg - Agent, Broker & Companies
- Real Estate Appraiser, Twinsburg - Appraisal Services
- Real Estate Appraisers & Consulting Services, Twinsburg
- Real Estate Developers, Twinsburg
- Real Estate Management, Twinsburg
- Real Estate Services, Twinsburg
- Recreational Good Manufacturers, Twinsburg
- Recycling Drop-Off Centers, Twinsburg
- Recycling Scrap & Waste Materials, Twinsburg - Scrap Metal, etc
- Refiners & Smelters Metals, Twinsburg
- Refrigeration & Cooling Equipment, Parts & Supplies , Twinsburg - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Twinsburg - Ac, Freezer, Refrigerator Repair
- Refrigerator & Freezer Equipment, Parts & Supplies, Twinsburg
- Rehabilitation Centers, Products & Services, Twinsburg
- Rehabilitation Specialists, Twinsburg
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- Religious Goods & Church Supplies Stores, Twinsburg
- Religious Organizations, Twinsburg
- Religious Practitioners, Twinsburg
- Repair Services, Twinsburg
- Research & Development Labs, Twinsburg - Laboratories
- Research Services, Twinsburg
- Residential, Twinsburg
- Residential Apartments, Twinsburg
- Residential Construction Contractors, Twinsburg - General Contractors
- Residential Real Estate - Rental & Leasing, Twinsburg
- Restaurant Equipment, Twinsburg
- Restaurant Equipment & Supplies, Twinsburg
- Restaurant Lobster, Twinsburg
- Restaurant Supplies & Equipment, Twinsburg
- Restaurants/Food & Dining, Twinsburg
- Retirement & Estate Planning, Twinsburg
- Retirement Communities & Home, Assisted Living & Apartments, Twinsburg
- Retirement Planning Consultants & Services, Twinsburg
- Rigging Service & Crane Hoisting, Twinsburg
- Roadside Assistance, Road Service & Towing Service, Twinsburg
- Roof Cleaning & Maintenance, Twinsburg - Roofing Services
- Roofing Consultants, Twinsburg - Roofing Companies
- Roofing Contractors, Twinsburg - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Twinsburg
- Rubber Products, Twinsburg
- Rubber Products - Retail, Twinsburg
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