- Dale (Population: 1,503)
- Dallas (Population: 2,557)
- Dallastown (Population: 4,087)
- Dalton (Population: 1,294)
- Danville (Population: 4,897)
- Darby (Population: 10,299)
- Darby Township (Population: 9,622)
- Davidsville (Population: 1,119)
- Delmont (Population: 2,497)
- Denver (Population: 3,332)
- Derry (Population: 2,991)
- Devon-Berwyn (Population: 5,067)
- Dickson City (Population: 6,205)
- Dillsburg (Population: 2,063)
- Donora (Population: 5,653)
- Dormont (Population: 9,305)
- Dover (Population: 1,815)
- Downingtown (Population: 7,589)
- Doylestown (Population: 8,227)
- Dravosburg (Population: 2,015)
- Drexel Hill (Population: 29,364)
- Dublin (Population: 2,083)
- DuBois (Population: 8,123)
- Duboistown (Population: 1,280)
- Dunbar (Population: 1,219)
- Duncannon (Population: 1,508)
- Duncansville (Population: 1,238)
- Dunmore (Population: 14,018)
- Dunnstown (Population: 1,365)
- Dupont (Population: 2,719)
- Duquesne (Population: 7,332)
- Duryea (Population: 4,634)
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