- Acalanes Ridge
- Acampo
- Adin
- Agoura
- Agoura Hills
- Agua Dulce
- Aguanga
- Ahwahnee
- Alamo
- Albion
- Alderpoint
- Aliso Viejo
- Alleghany
- Allendale
- Allensworth
- Alondra Park
- Alpaugh
- Alpine
- Alpine Meadows
- Alpine Village
- Alpine Village
- Alta
- Alta Sierra
- Alta Sierra
- Alto
- Alum Rock
- Amador City
- Amesti
- Anchor Bay
- Angels Camp
- Angwin
- Antelope
- Anza
- Apple Valley
- Aptos
- Aptos Hills-Larkin Valley
- Arbuckle
- Arcata
- Arden-Arcade
- Armona
- Aromas
- Arroyo Grande
- Artois
- Arvin
- Ashland
- Aspen Springs
- Atascadero
- Atherton
- Atwater
- Auberry
- Auburn Lake Trails
- August
- Avenal
- Avery
- Avila Beach
- Avocado Heights