- Aaronsburg
- Aaronsburg
- Abbottstown
- Abington
- Ackermanville
- Acme
- Adamsburg
- Adamstown
- Adamsville
- Adamsville
- Addison
- Airville
- Akron
- Alba
- Albion
- Albion
- Albrightsville
- Alburtis
- Aldan
- Alexandria
- Alfarata
- Aliquippa
- Alleghenyville
- Allenport
- Allenport
- Allensville
- Allentown
- Allenwood
- Allison
- Allison Park
- Allport
- Almedia
- Alpine Mountain
- Alsace Manor
- Altamont
- Altoona
- Alum Bank
- Ambler
- Ambridge
- Amity Gardens
- Ancient Oaks
- Annville
- Apollo
- Applewold
- Archbald
- Ardmore
- Arendtsville
- Aristes
- Arlington Heights
- Armagh
- Arnold
- Arnold City
- Arnot
- Arona
- Ashland
- Ashley
- Ashville
- Aspers
- Aspinwall
- Atglen
- Athens
- Atkinson Mills
- Atlantic
- Atlas
- Atlasburg
- Atwood
- Auburn
- Audubon
- Austin
- Avalon
- Avella
- Avis
- Avoca
- Avon
- Avondale
- Avonia
- Avonmore