Time Zone: Sonoma County lies in the Pacific Time Zone (PST/PDT) and observes daylight saving time.
The community of Santa Rosa is the Seat for Sonoma County.
Sonoma County is one of the original counties of California and was founded in 1850.
From the Census Estimates for 2009, <1> Sonoma had a population of 472,102 people. This is an increase of 2.94% since the last Census (which gave a population of 458,614 people in 2000).
At the time of the 2000 Census, Sonoma represented 1.35% of the total population of California, making it the state's 16th 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 | 483,878 | +5.51% | +2.49% since 2009 |
2009 | 472,102 | +2.94% | +1.22% since 2008 |
2008 | 466,424 | +1.7% | +1.08% since 2007 |
2007 | 461,424 | +0.61% | |
--- | | | 2000 | 458,614 | The Last Census |
More information can be found on the Sonoma County Census Page for Sonoma County. .
Below are some of the communities located in Sonoma County (for more communities, please visit our Nearby Page for Sonoma County):
Community | 2009 Population | 2000 Population | Change (2009vs. 2000) |
Santa Rosa | 157,468 | 147,595 | 6.69% increase |
Petaluma | 55,178 | 54,548 | 1.15% increase |
Rohnert Park | 40,921 | 42,236 | 3.11% decrease |
Windsor | 25,619 | 22,744 | 12.64% increase |
Healdsburg | 11,143 | 10,722 | 3.93% increase |
Websites for Sonoma County
If you know of a history or genealogy society whose interest includes Sonoma 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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