Barrios de California A
- ABC
- Adams
- Adams Hill
- Adams North
- Adams Point
- Adams Terrace
- Alamo Square
- Albertstone-Beck
- Alexander
- Alexian
- Alkali Flat
- Allendale
- Allied Gardens
- Alma-Almaden
- Almaden Valley
- Almaden-Clare Felice
- Almond Grove
- Almonte
- Alondra Golf Course
- Alta Heights
- Alta Mesa
- Alto Sutton Manor
- Alvin-Burdette
- Amberton
- American Beauty
- American River Canyon
- Anaheim Resort
- Anatolia Village
- Anderson East
- Anderson West
- Anne Darling
- Anza Vista
- Aquatic Park
- Arbors at Oakshade
- Arden Estates
- Arden Park Vista
- Ardenwood
- Arlanza
- Arleta
- Arlington
- Arlington Farms/West Manor
- Arlington Heights
- Arlington Heights
- Arlington South
- Arrowhead
- Arroyo Grande/Nipomo
- Artcraft Manor
- Artesia Pilar
- Artisan
- Arts District
- Ashland
- Assumption Parish
- Atascadero/Templeton
- Atwater Village
- Auzerais-Josefa
- Avalon
- Avila Beach/Los Osos
- Avis-Cherry
- Azalea-Hollywood Park