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The Commemorative
Quarter for
The Commemorative Quarter for Idaho

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

The community of Boise City is the Seat for Ada County. Boise City is also the capital of Idaho.

Ada County was founded in 1864 and was created by taking area from BoiseCounty.

From the Census Estimates for 2009, <1> Ada had a population of 384,656 people. This is an increase of 27.83% since the last Census (which gave a population of 300,904 people in 2000).

At the time of the 2000 Census, Ada represented 23.25% of the total population of Idaho, making it the state's most populous county (out of 44 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
2010392,365+30.4%+2% since 2009
2009384,656+27.83%+1.4% since 2008
2008379,350+26.07%+1.85% since 2007
2000300,904The Last Census

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


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

Community 2009
(2009vs. 2000)
Boise City   205,707185,78710.72% increase  
Meridian   68,51634,91996.2% increase  
Eagle   19,66811,08577.4% increase  
Kuna   13,9095,382158.4% increase  
Garden City   11,89110,62411.93% increase  

Websites for Ada County

Official Website:   www.adaweb.net/

If you know of a history or genealogy society whose interest includes Ada 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. For more information, please visit the U.S. Census Bureau.

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

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