- Radnor Township (Population: 30,878)
- Ramblewood (Population: 1,054)
- Rankin (Population: 2,315)
- Reading (Population: 81,207)
- Reamstown (Population: 3,498)
- Red Hill (Population: 2,196)
- Red Lion (Population: 6,149)
- Reiffton (Population: 2,888)
- Reinerton-Orwin-Muir (Population: 1,037)
- Renovo (Population: 1,318)
- Republic (Population: 1,396)
- Reserve Township (Population: 3,856)
- Reynoldsville (Population: 2,710)
- Rheems (Population: 1,557)
- Richboro (Population: 6,678)
- Richland (Population: 1,508)
- Richlandtown (Population: 1,283)
- Ridgway (Population: 4,591)
- Ridley Park (Population: 7,196)
- Rimersburg (Population: 1,051)
- Riverside (Population: 1,861)
- Roaring Spring (Population: 2,418)
- Robesonia (Population: 2,036)
- Robinson Township (Population: 12,289)
- Rochester (Population: 4,014)
- Rockledge (Population: 2,577)
- Roseto (Population: 1,653)
- Ross Township (Population: 32,551)
- Rothsville (Population: 3,017)
- Royersford (Population: 4,246)
- Russellton (Population: 1,530)
- Rutherford (Population: 3,859)
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