- Adamstown (Population: 1,203)
- Akron (Population: 4,046)
- Albion (Population: 1,607)
- Alburtis (Population: 2,117)
- Aldan (Population: 4,313)
- Aliquippa (Population: 11,734)
- Allentown (Population: 106,632)
- Almedia (Population: 1,056)
- Altamont (Population: 2,689)
- Altoona (Population: 49,523)
- Ambler (Population: 6,426)
- Ambridge (Population: 7,769)
- Amity Gardens (Population: 3,370)
- Ancient Oaks (Population: 3,161)
- Annville (Population: 4,518)
- Apollo (Population: 1,765)
- Archbald (Population: 6,220)
- Ardmore (Population: 12,616)
- Arlington Heights (Population: 5,132)
- Arnold (Population: 5,667)
- Ashland (Population: 3,283)
- Ashley (Population: 2,866)
- Aspinwall (Population: 2,960)
- Atglen (Population: 1,217)
- Athens (Population: 3,415)
- Audubon (Population: 6,549)
- Avalon (Population: 5,294)
- Avis (Population: 1,492)
- Avoca (Population: 2,851)
- Avon (Population: 2,856)
- Avondale (Population: 1,108)
- Avonia (Population: 1,331)
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