- Alta
- Alta Hill
- Alta Loma
- Alta Sierra
- Alta Sierra Estates
- Alta Sierra Ranches
- Alta Vista
- Alta Vista Park
- Altacanyada
- Altadena
- Altamont
- Altaville
- Alten
- Alto
- Alturas
- Alum Rock
- Alviso
- Amador City
- Amberwood Mobile Home Park
- Ambler Park
- Amboy
- Ambrose
- American Canyon
- Amesti
- Amos
- Ampere
- Amsterdam
- Isla Anacapa
- Anaheim
- Anaheim Royal Mobile Home Park