- Acalanes Ridge
- Acampo
- Acton
- Adelanto
- Adin
- Agoura
- Agoura Hills
- Agua Dulce
- Aguanga
- Ahwahnee
- Alameda
- Alamo
- Albany
- Albion
- Alderpoint
- Alhambra
- Aliso Viejo
- Alleghany
- Allendale
- Allensworth
- Alondra Park
- Alpaugh
- Alpine
- Alpine Meadows
- Alpine Village
- Alpine Village
- Alta
- Alta Sierra
- Alta Sierra
- Altadena
- Alto
- Alturas
- Alum Rock
- Amador City
- American Canyon
- Amesti
- Anaheim
- Anchor Bay
- Anderson
- Angwin
- Antelope
- Antioch
- Anza
- Apple Valley
- Aptos
- Aptos Hills-Larkin Valley
- Arbuckle
- Arcadia
- Arcata
- Arden-Arcade
- Armona
- Arnold
- Aromas
- Arroyo Grande
- Artesia
- Artois
- Arvin
- Ashland
- Aspen Springs
- Atascadero
- Atherton
- Atwater
- Auberry
- Auburn
- Auburn Lake Trails
- August
- Avalon
- Avenal
- Avery
- Avila Beach
- Avocado Heights
- Azusa
