Learn About
The Commemorative
Quarter for
The Commemorative Quarter for Missouri

Time Zone: Washington County lies in the Central Time Zone (CST/CDT) and observes daylight saving time.

The community of Potosi is the Seat for Washington County.

Washington County was founded in 1813 and was created by taking area from Sainte GenevieveCounty.

From the Census Estimates for 2009, <1> Washington had a population of 24,400 people. This is an increase of 4.52% since the last Census (which gave a population of 23,344 people in 2000).

At the time of the 2000 Census, Washington represented 0.42% of the total population of Missouri, making it the state's 46th most populous county (out of 115 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
201025,195+7.93%+3.26% since 2009
200924,400+4.52%-0.36% since 2008
200824,488+4.9%+0.75% since 2007
200023,344The Last Census

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


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

Community 2009
(2009vs. 2000)
Potosi   2,7062,6621.65% increase  
Irondale   4504372.97% increase  
Mineral Point   3843635.79% increase  
Caledonia   1651584.43% increase  

Other Roadside Stops ...

About Missouri

Index of Cities, Towns and Villages for Missouri

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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