Places beginning with AR in Pennsylvania, United States
- Ararat
- Ararat, Township of
- Arbor
- Arbuckle
- Arcadia
- Archbald
- Archbald, Borough of
- Archbald (historical), Township of
- Arch Rock
- Arch Spring
- Arcola
- Ardara
- Arden
- Ardenheim
- Arden Mines
- Ardmore
- Ardmore Park
- Ardsley
- Arendtsville
- Arendtsville, Borough of
- Arensburg
- Argentine
- Argus
- Ariosa
- Aristes
- Arlingham
- Arlington
- Arlington Heights
- Arlington Knolls
- Arlington Park
- Arlington (subdivision)
- Armagh
- Armagh, Borough of
- Armagh, Township of
- Armbrust
- Armenia, Township of
- Armstrong
- Armstrong County
- Armstrong, Township of
- Armstrong, Township of
- Arndts
- Arnold
- Arnold City
- Arnold, City of
- Arnot
- Arnots Addition
- Arona
- Arona, Borough of
- Aronimink
- Aronwold
- Arrowhead Lake
- Arroyo
- Artemas
- Arthurs