Time Zone: Contra Costa County lies in the Pacific Time Zone (PST/PDT) and observes daylight saving time.
The community of Martinez is the Seat for Contra Costa County.
Contra Costa County is one of the original counties of California and was founded in 1850.
From the Census Estimates for 2009, <1> Contra Costa had a population of 1,041,274 people. This is an increase of 9.74% since the last Census (which gave a population of 948,816 people in 2000).
At the time of the 2000 Census, Contra Costa represented 2.8% of the total population of California, making it the state's 9th most populous county (out of 58 counties).
The following table shows the recent changes in population. Other than 2000, the population counts have been estimated by the Census Bureau.
Year | Population | Change Since 2000 | Year-to-Year Change |
2010 | 1,049,025 | +10.56% | +0.74% since 2009 |
2009 | 1,041,274 | +9.74% | +1.54% since 2008 |
2008 | 1,025,464 | +8.08% | +1.48% since 2007 |
2007 | 1,010,542 | +6.51% | |
--- | | | 2000 | 948,816 | The Last Census |
More information can be found on the Contra Costa County Census Page for Contra Costa County. .
Below are some of the communities located in Contra Costa County (for more communities, please visit our Nearby Page for Contra Costa County):
Community | 2009 Population | 2000 Population | Change (2009vs. 2000) |
Concord | 122,224 | 121,780 | 0.36% increase |
Richmond | 103,165 | 99,216 | 3.98% increase |
Antioch | 101,181 | 90,532 | 11.76% increase |
Pittsburg | 65,128 | 56,769 | 14.72% increase |
Walnut Creek | 64,007 | 64,296 | 0.45% decrease |
Websites for Contra Costa County
If you know of a history or genealogy society whose interest includes Contra Costa County, would you please send us the URL for their website? We would like to add their link to our Gazetteer. To contact us, please visit our Feedback Page.
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