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The City of Antioch is located in Contra Costa County in the state of California (CA).

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Antioch, California, a City, in Contra Costa County.
Latest Antioch, CA News:

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County Level News: Contra Costa County News
State Level News: State of California News
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Antioch, CA Map (Interactive)

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Antioch Latitude: 37.9799 Longitude: -121.8022

The The Zip Codes for Antioch, CA are:
94509, 94531

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We also provide additional resources for the rest of Contra Costa County and the State of California.

The City of Antioch

Facts & Data:

Antioch California Physical Characteristics:

The City of Antioch has an area of 29.1 square miles
  • Land: 28.348425096525 Sq. Mi. (97.48%)
  • Water: 0.73431158301158 Sq. Mi.(2.52%)
The Antioch City takes up 3.6% of the area of Contra Costa County.

Map Location Coordinates:

  • Latitude: +37.9775410
  • Longitude: -121.7976176
Antioch Land Water Pie Chart

Antioch, CA Climate Information:

  • Average Temperature: 61.5°F
  • Average Rainfall: 13.22 inches
  • Average Snowfall: 0 inches
*Based on annual average for Weather Station USC00040232 ANTIOCH PUMP PLT #3
Latitude: 37.9856 Longitude: -121.7458 Elevation: 18.3 feet.

Antioch, CA Population Data:

According to the 2010 U.S. Census, the population of Antioch was 102,372 people, which is 9.8 % of the entire population of Contra Costa County.


  • 48.65% Male
  • 51.35% Female


  • 48.923% White
  • 17.258% Black
  • 10.461% Asian
  • 0.87% American Indian/Alaskan Native
  • 0.80% Pacific Islander
  • 7.716% Mixed
  • 13.978% Other


  • 68.32% Not Hispanic or Latino
  • 31.68% Hispanic or Latino
Antioch Race Population Ring Chart

Antioch, CA Housing Information:

Average Household Size: 3.2
Number of Residences: 34,849
  • Occupied: 32,252 (92.55%)
  • Vacant: 2,597 (7.45%)
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Re/Max Preferred Properties
653118 - Real Estate
2830 Lone Tree Way, Antioch, California 94509-4922
Mark Jordan (925) 757-8080 (925) 757-8582 http://www.markcynthia.com
See more in the Antioch Business Directory
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