Learn About
The Commemorative
Quarter for
The Commemorative Quarter for California

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

The community of San Luis Obispo is the Seat for San Luis Obispo County.

San Luis Obispo County is one of the original counties of California and was founded in 1850.

From the Census Estimates for 2009, <1> San Luis Obispo had a population of 266,971 people. This is an increase of 8.23% since the last Census (which gave a population of 246,681 people in 2000).

At the time of the 2000 Census, San Luis Obispo represented 0.73% of the total population of California, making it the state's 25th 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
2010269,637+9.31%+1% since 2009
2009266,971+8.23%+0.69% since 2008
2008265,134+7.48%+1.31% since 2007
2000246,681The Last Census

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


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

Community 2009
(2009vs. 2000)
San Luis Obispo   44,07544,1740.22% decrease  
El Paso de Robles   28,67724,29718.03% increase  
Atascadero   28,30726,4117.18% increase  
Arroyo Grande   17,23815,8518.75% increase  
Grover Beach   13,20013,0671.02% increase  

Websites for San Luis Obispo County

Official Website:   www.co.slo.ca.us/

If you know of a history or genealogy society whose interest includes San Luis Obispo 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.

Other Roadside Stops ...

About California

Visit our Community Index for California

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.

- Return to Citation

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

- Return to Citation