Barrios de California A
- ABC
- Adams Hill
- Adams North
- Adams Point
- Adams Terrace
- Alexian
- Alkali Flat
- Allendale
- Allied Gardens
- Alma-Almaden
- Almaden-Clare Felice
- Almond Grove
- Alta Mesa
- American River Canyon
- Anaheim Resort
- Anatolia Village
- Anderson West
- Ardenwood
- Arlanza
- Arlington
- Arlington Farms/West Manor
- Arlington Heights
- Arlington South
- Arrowhead
- Arrowhead Farms
- Arroyo Grande/Nipomo
- Artcraft Manor
- Artesia Pilar
- Arts District
- Ashland
- Aspen
- Assumption Parish
- Aston Avenue
- Atascadero/Templeton
- Atwater Village
- Auzerais-Josefa
- Avalon
- Avila Beach/Los Osos
- Avis-Cherry
- Avondale
- Azalea-Hollywood Park