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

The community of Littleton is the Seat for Arapahoe County.

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

From the Census Estimates for 2009, <1> Arapahoe had a population of 565,360 people. This is an increase of 15.86% since the last Census (which gave a population of 487,967 people in 2000).

At the time of the 2000 Census, Arapahoe represented 11.34% of the total population of Colorado, making it the state's 4th 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
2010572,003+17.22%+1.18% since 2009
2009565,360+15.86%+1.98% since 2008
2008554,372+13.61%+2.02% since 2007
2000487,967The Last Census

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


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

Community 2009
(2009vs. 2000)
Littleton   41,08440,3401.84% increase  
Englewood   32,88331,7273.64% increase  
Greenwood Village   14,34111,03529.96% increase  
Cherry Hills Village   6,4375,9588.04% increase  
Sheridan   6,1705,60010.18% increase  

Websites for Arapahoe County

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

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