Learn About
The Commemorative
Quarter for
The Commemorative Quarter for Colorado

Time Zone: Boulder County lies in the Mountain Time Zone (MST/MDT) and observes daylight saving time.

The community of Boulder is the Seat for Boulder County.

Boulder County is one of the original counties of Colorado and was founded November 1, 1861.

From the Census Estimates for 2009, <1> Boulder had a population of 303,482 people. This is an increase of 4.19% since the last Census (which gave a population of 291,288 people in 2000).

At the time of the 2000 Census, Boulder represented 6.77% of the total population of Colorado, making it the state's 6th most populous county (out of 64 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
2010294,567+1.13%-2.94% since 2009
2009303,482+4.19%+1.01% since 2008
2008300,452+3.15%+1.61% since 2007
2000291,288The Last Census

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


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

Community 2009
(2009vs. 2000)
Boulder   100,16094,6735.8% increase  
Longmont   88,42571,09324.38% increase  
Lafayette   26,14623,19712.71% increase  
Louisville   19,65618,9373.8% increase  
Erie   17,2556,291174.3% increase  

Websites for Boulder County

Official Website:   www.co.boulder.co.us/

If you know of a history or genealogy society whose interest includes Boulder 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 Colorado

Communities in Colorado

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