- Racing Car Supplies, Duncansville
- Radio & Television Repair Shops , Duncansville - TV Repair
- Railroad Companies, Duncansville
- Real Estate, Duncansville - Agent, Broker & Companies
- Real Estate Developers, Duncansville
- Real Estate Services, Duncansville
- Record Destruction Service, Duncansville
- Record Storage, Destruction & Management, Duncansville
- Recreational Services, Duncansville
- Recreational Vehicles & Campers Rent & Lease, Duncansville
- Recycling Drop-Off Centers, Duncansville
- Reducing Exercise & Weight Control Services, Duncansville
- Refrigerated Truck, Duncansville
- Refuse Collection & Disposal Services, Duncansville
- Refuse Systems & Garbage Disposal, Duncansville
- Rehabilitation Centers, Products & Services, Duncansville
- Rehabilitation Specialists, Duncansville
- Religious Organizations, Duncansville
- Repair Services, Duncansville
- Research & Development Engineers, Duncansville
- Research & Development Labs, Duncansville - Laboratories
- Research Services, Duncansville
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- Residential, Duncansville
- Residential Apartments, Duncansville
- Residential Care Facilities, Duncansville
- Residential Construction Contractors, Duncansville - General Contractors
- Restaurant & Food Service Management Services, Duncansville
- Restaurant & Lounge, Bar, Or Pub, Duncansville
- Restaurants/Food & Dining, Duncansville
- Retail Book Stores, Duncansville
- Retirement Communities & Home, Assisted Living & Apartments, Duncansville
- Rheumatologists, Duncansville - Rheumatology Doctors, Physicians & Surgeons
- Riding & Rodeo Services, Duncansville
- Riding Equipment, Duncansville
- Rigging Service & Crane Hoisting, Duncansville
- Rodeo & Equestrian Equipment & Supplies, Duncansville
- Roofing Consultants, Duncansville - Roofing Companies
- Roofing Contractors, Duncansville - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Duncansville
- RV & Campers Repair & Service, Duncansville
- Rv Parks, Duncansville
- RV Repair, Duncansville - Recreational Vehicle
- Rvs Sales, Rental & Leasing, Duncansville
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