A
- Aaronsburg
- Abbottstown
- Abdera
- Aberdeen
- Abington
- Abrahamsville
- Academia
- Academy Corners
- Academy Garden
- Accomac
- Acheson
- Acker
- Ackermanville
- Acme
- Acorn
- Acosta
- Adah
- Adams
- Adamsburg
- Adams Crossing
- Adamsdale
- Adamstown
- Adamsville
- Adamsville
- Addison
- Admire
- Adrian
- Advance
- Ahrensville
- Aiken
- Ailston
- Airville
- Airydale
- Ajax
- Akeley
- Akerly
- Akersville
- Akron
- Aladdin
- Alaska
- Alba
- Albany
- Albers
- Albion
- Albion
- Albrightsville
- Alburtis
- Alcoa Center
- Aldan
- Alden
- Aldenville
- Aldovin
- Aleppo
- Alexander Springs
- Alexandria
- Alfarata
- Alford
- Alice
- Aliquippa
- Allegheny Acres
- Allegheny Springs
- Allemans
- Allendale
- Allen Lane
- Allenport
- Allens Mills
- Allensville
- Allentown
- Allenvale
- Allenwood
- Allis Hollow
- Allison
- Allison Heights
- Allison Park
- Allport
- Allport
- Almaden
- Almedia
- Almont
- Alpine
- Alpine Heights
- Alsace Manor
- Altamont
- Altenwald
- Althouses
- Altonah
- Altoona
- Altor
- Alum Bank
- Alum Rock
- Aluta
- Alvan
- Alverda
- Alverton
- Amaranth
- Ambau
- Amberson
- Ambler
- Ambridge
- Ambridge Heights
- Ambrose
- Amend
- Amity
- Amity Gardens
- Amityville
- Amsbry
- Analomink
- Ancient Oaks
- Andalusia
- Anderson
- Andersonburg
- Anderson Creek
- Andersons Corner
- Andersontown
- Andover
- Andreas
- Andrew Bridge
- Andrews Settlement
- Angelica
- Angels
- Anita
- Annandale
- Annin Creek
- Annisville
- Annville
- Anselma
- Ansonia
- Ansonville
- Antes Fort
- Antrim
- Apollo
- Appenzell
- Applebachsville
- Applewold
- Aquetong
- Ararat
- Arbuckle
- Arcadia
- Archbald
- Arch Rock
- Arch Spring
- Arcola
- Ardara
- Arden
- Ardenheim
- Ardmore
- Arendtsville
- Arensburg
- Argentine
- Argus
- Ariosa
- Aristes
- Arlington
- Arlington Heights
- Armagh
- Armbrust
- Armstrong
- Arndts
- Arnold
- Arnot
- Arona
- Aronwold
- Arrowhead Lake
- Artemas
- Arthurs
- Asaph
- Asbury
- Asbury
- Ashcom
- Asherton
- Ashfield
- Ashland
- Ashley
- Ashtola
- Ashtree
- Ashville
- Aspers
- Aspinwall
- Aston Mills
- Atco
- Atglen
- Athens
- Atkinson Mills
- Atlantic
- Atlas
- Atlasburg
- Atwood
- Auburn
- Auburn Center
- Auburn Four Corners
- Audubon
- Aughwick
- Augustaville
- Aultman
- Austin
- Austinburg
- Austinville
- Autumn Leaves
- Avalon
- Avella
- Avery
- Avis
- Avoca
- Avon
- Avondale
- Avon Heights
- Avonia
- Avonmore
- Avoy
- Axemann
- Ayers Crossroads
- Ayers Hill
- Azelta