- Acton (Population: 2,390)
- Adelanto (Population: 18,130)
- Agoura Hills (Population: 20,537)
- Alameda (Population: 72,259)
- Alamo (Population: 15,626)
- Albany (Population: 16,444)
- Alhambra (Population: 85,804)
- Aliso Viejo (Population: 40,166)
- Alondra Park (Population: 8,622)
- Alpine (Population: 13,143)
- Alta Sierra (Population: 6,522)
- Altadena (Population: 42,610)
- Alturas (Population: 2,892)
- Alum Rock (Population: 13,479)
- American Canyon (Population: 9,774)
- Amesti (Population: 2,436)
- Anaheim (Population: 328,014)
- Anderson (Population: 9,022)
- Angels City (Population: 3,004)
- Angwin (Population: 3,148)
- Antioch (Population: 90,532)
- Apple Valley (Population: 54,239)
- Aptos (Population: 9,396)
- Aptos Hills-Larkin Valley (Population: 2,361)
- Arbuckle (Population: 2,332)
- Arcadia (Population: 53,054)
- Arcata (Population: 16,651)
- Arden-Arcade (Population: 96,025)
- Armona (Population: 3,239)
- Arnold (Population: 4,218)
- Aromas (Population: 2,797)
- Arroyo Grande (Population: 15,851)
- Artesia (Population: 16,380)
- Arvin (Population: 12,956)
- Ashland (Population: 20,793)
- Atascadero (Population: 26,411)
- Atherton (Population: 7,194)
- Atwater (Population: 23,113)
- Auberry (Population: 2,053)
- Auburn (Population: 12,462)
- August (Population: 7,808)
- Avalon (Population: 3,127)
- Avenal (Population: 14,674)
- Avocado Heights (Population: 15,148)
- Azusa (Population: 44,712)
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