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Time Zone: San Mateo County lies in the Pacific Time Zone (PST/PDT) and observes daylight saving time.

The community of Redwood City is the Seat for San Mateo County.

San Mateo County was founded in 1856 and was created by taking area from San FranciscoCounty.

From the Census Estimates for 2009, <1> San Mateo had a population of 718,989 people. This is an increase of 1.67% since the last Census (which gave a population of 707,161 people in 2000).

At the time of the 2000 Census, San Mateo represented 2.09% of the total population of California, making it the state's 13th 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.

Since 2000
Year-to-Year Change
2009718,989+1.67%+1.54% since 2008
2008708,100+0.13%+1.54% since 2007
2000707,161The Last Census

More information can be found on the San Mateo County Census Page for San Mateo County.


Below are some of the communities located in San Mateo County (for more communities, please visit our Nearby Page for San Mateo County):

Community 2009
(2009vs. 2000)
Daly City   102,165103,6211.41% decrease  
San Mateo   92,79192,4820.33% increase  
Redwood City   74,50875,4021.19% decrease  
South San Francisco   62,83060,5523.76% increase  
San Bruno   41,42040,1653.12% increase  

Websites for San Mateo County

Official Website:   www.co.sanmateo.ca.us/

If you know of a history or genealogy society whose interest includes San Mateo 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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Footnotes ...

<1>On a yearly basis, the US Census Bureau creates an estimate of the county's population. Keep in mind that this is an estimate and not an actual count. The last physical count was the 2000 Census and the next count will be for the 2010 Census.

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<2>All Quarter-dollar coin images from the United States Mint.

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