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Diablo is located in Contra Costa County in the state of California (CA).

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Diablo, California, in Contra Costa County.
Latest Diablo, CA News:

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

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Diablo Latitude: 37.8351 Longitude: -121.9569

The Zip Code for Diablo, CA is: 94528

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


Facts & Data:

Diablo California Physical Characteristics:

Diablo has an area of 1.4 square miles
  • Land: 1.357444015444 Sq. Mi. (100.00%)
  • Water: 0 Sq. Mi.(0.00%)
The Diablo CDP takes up 0.2% of the area of Contra Costa County.

Map Location Coordinates:

  • Latitude: +37.8408085
  • Longitude: -121.9564564
Diablo Land Water Pie Chart

Diablo, CA Climate Information:

  • Average Temperature: 58.8°F
  • Average Rainfall: 25.04 inches
  • Average Snowfall: 0.9 inches
*Based on annual average for Weather Station USC00045915 MT DIABLO JUNCTION
Latitude: 37.8792 Longitude: -121.9303 Elevation: 661.4 feet.

Diablo, CA Population Data:

According to the 2010 U.S. Census, the population of Diablo was 1,158 people, which is 0.1 % of the entire population of Contra Costa County.


  • 48.70% Male
  • 51.30% Female


  • 91.969% White
  • 0.086% Black
  • 4.750% Asian
  • 0.17% American Indian/Alaskan Native
  • 0.00% Pacific Islander
  • 2.591% Mixed
  • 0.432% Other


  • 96.63% Not Hispanic or Latino
  • 3.37% Hispanic or Latino
Diablo Race Population Ring Chart

Diablo, CA Housing Information:

Average Household Size: 2.7
Number of Residences: 439
  • Occupied: 412 (93.85%)
  • Vacant: 27 (6.15%)
Spotlight Left Diablo Business Spotlight
Diablo Country Club
839998 - Non-Profit Organizations
1700 Club House Rd, Diablo, California 94528-0000
(925) 837-7040
See more in the Diablo Business Directory
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