- Radio Stations & Broadcasting Companies, Hornell
- Radiotelephone Communications, Hornell
- Railroad Cars Manufacturers, Hornell
- Railroad Equipment & Supplies Manufacturers, Hornell
- Real Estate, Hornell - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Hornell
- Real Estate Appraisers & Consulting Services, Hornell
- Real Estate Consultants, Hornell
- Real Estate Developers, Hornell
- Real Estate Services, Hornell
- Recycling Drop-Off Centers, Hornell
- Recycling Scrap & Waste Materials, Hornell - Scrap Metal, etc
- Religious Education, Hornell
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- Religious Organizations, Hornell
- Rental & Leasing Business Equipment, Hornell
- Repair Services, Hornell
- Research Services, Hornell
- Residential, Hornell
- Residential Apartments, Hornell
- Residential Care Facilities, Hornell
- Restaurants/Food & Dining, Hornell
- Retirement Communities & Home, Assisted Living & Apartments, Hornell
- Retirement Home Referral Service, Hornell - Nursing Home & Care Facilities Referrals & Information
- RV Parts, Accessories & Equipment, Hornell - ATV & Recreation Vehicles
- RV Repair & Service, Hornell - ATV & Recreation Vehicles
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