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ZIP Code Database - Facts & Stats

Data Last Updated: May 1, 2022

ZIP Codes for City of Antioch, CA

Antioch, CA Covers 2 ZIP Codes

ZIP CodeTypeCountyPopulationArea Code(s)
ZIP Code 94509StandardContra Costa62,439925
ZIP Code 94531StandardContra Costa40,290925

Timezone(s):Pacific (GMT -08:00)
Population:102,372 (More Details)
Male Population:49,807
Female Population:52,565
Median Age:34
ZIP Codes:2
Area Codes:1
Total Area:804 square miles (county)
Land Area:723 square miles (county)
Water Area:81 square miles (county)

Antioch, CA Demographic Information *

Total population102,372
Male population49,807
Female population52,565
Median age (years)33.8
White Population50,083
Black Population17,667
Indian Population887
Asian Population10,709
Hawaiian Population817
Hispanic Population32,436
Median age (Male)32.4
Median age (Female)35
Total households32,252
Family households (families)25,023
Average household size3.15
Average family size3.52
Total housing units34,849
* Demographic data is based on 2010 Census. Products


  1. U.S. Postal Service [Last Updated: 5/1/2022],
  2. Internal Data Creation [Last Updated: 5/1/2022],
  3. U.S. Geological Survey [Updated as needed],
  4. U.S. Census [Updated Yearly],
  5. U.S. Census 2010 [Decennial] [Last Updated: 1/1/2010],