- Radiator Coolant & Solvents, Westerville - Engine Coolant
- Radio Communications Equipment & Systems , Westerville
- Radio Stations & Broadcasting Companies, Westerville
- Radiotelephone Communications, Westerville
- Radon Testing & Services, Westerville
- Railroad Companies, Westerville
- Range & Oven Repair, Service & Sales, Westerville
- Ready Mix Concrete, Westerville - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Westerville
- Real Estate, Westerville - Agent, Broker & Companies
- Real Estate Agencies, Westerville
- Real Estate Agent & Broker Services, Westerville
- Real Estate Agent - Property Lessors, Westerville
- Real Estate Appraiser, Westerville - Appraisal Services
- Real Estate Appraisers & Consulting Services, Westerville
- Real Estate Attorneys & Lawyers, Westerville
- Real Estate Attorneys & Lawyers, Westerville
- Real Estate Broker, Westerville
- Real Estate Consultants, Westerville
- Real Estate Developers, Westerville
- Real Estate Lawyers & Attorneys, Westerville
- Real Estate Management, Westerville
- Real Estate Services, Westerville
- Record Storage, Destruction & Management, Westerville
- Recording Studio Service - Sound & Video, Westerville
- Recreational Equipment Repair & Service, Westerville
- Recreational Services, Westerville
- Recycling & Sanitation Consultants, Westerville
- Red Wing Shoes, Westerville
- Reducing Exercise & Weight Control Services, Westerville
- Refrigeration & Cooling Equipment, Parts & Supplies , Westerville - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Westerville - Ac, Freezer, Refrigerator Repair
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- Refrigerator & Freezer Equipment, Parts & Supplies, Westerville
- Refrigerator Sales, Service & Repair, Westerville - Fridge
- Rehabilitation Centers, Products & Services, Westerville
- Rehabilitation Specialists, Westerville
- Religious Education, Westerville
- Religious Goods & Church Supplies Stores, Westerville
- Religious Organizations, Westerville
- Religious Practitioners, Westerville
- Rental Property Management, Westerville
- Repair Services, Westerville
- Research & Development Bureaus, Westerville - Commercial, Economic, Sociological & Educational Research
- Research Services, Westerville
- Residential, Westerville
- Residential Apartments, Westerville
- Residential Care Facilities, Westerville
- Residential Construction Contractors, Westerville - General Contractors
- Residential Real Estate Companies, Westerville
- Restaurant & Lounge, Bar, Or Pub, Westerville
- Restaurant Equipment, Westerville
- Restaurant Equipment & Supplies, Westerville
- Restaurant Supplies & Equipment, Westerville
- Restaurants - Breakfast Brunch Lunch, Westerville
- Restaurants/Food & Dining, Westerville
- Retail Book Stores, Westerville
- Retirement Communities & Home, Assisted Living & Apartments, Westerville
- Riding & Rodeo Services, Westerville
- Right Of Way Acquisition Contractors, Westerville
- Robots & Robotics System, Westerville
- Roofing Consultants, Westerville - Roofing Companies
- Roofing Contractors, Westerville - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rv Parks, Westerville
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