- Railroad & Subway Construction Contractors, Duncannon
- Railroad Companies, Duncannon
- Railroad Contractors, Duncannon
- Ready Mix Concrete, Duncannon - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Duncannon
- Real Estate, Duncannon - Agent, Broker & Companies
- Real Estate Developers, Duncannon
- Real Estate Services, Duncannon
- Recreational Good Manufacturers, Duncannon
- Recycling Drop-Off Centers, Duncannon
- Recycling Scrap & Waste Materials, Duncannon - Scrap Metal, etc
- Religious Organizations, Duncannon
- Repair Services, Duncannon
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- Residential, Duncannon
- Residential Apartments, Duncannon
- Residential Care Facilities, Duncannon
- Residential Construction Contractors, Duncannon - General Contractors
- Restaurant & Lounge, Bar, Or Pub, Duncannon
- Restaurants/Food & Dining, Duncannon
- Retail Book Stores, Duncannon
- Retirement Communities & Home, Assisted Living & Apartments, Duncannon
- Road Construction, Duncannon - Companies & Contractors
- RV & Campers Repair & Service, Duncannon
- Rv Parks, Duncannon
- RV Repair, Duncannon - Recreational Vehicle
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