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The Commemorative
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The Commemorative Quarter for Iowa

The 2000 Census showed that Washington County had a population of 20,670 people. This represented 0.71% of the total population of Iowa, making it the state's 32nd most populous county (out of 99 counties).

From the Census Estimates for 2009<1>, Washington had a population of 21,258 people. This is an increase of 2.84% since the 2000 Census.

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
201021,704+5%+2.1% since 2009
200921,258+2.84%+0.21% since 2008
200821,214+2.63%+0.29% since 2007
200721,152+2.33%+0.25% since 2006
200621,100+2.08%+0.3% since 2005
200521,037+1.78%+0.12% since 2004
200121,000+1.6%+1.6% since 2000
200020,670The Last Census

Washington County had 8,543 Housing Units<2> at the time of the 2000 Census.

The 2000 Census shows that Washington County has a total area<3> of 570 square miles [1,478 km²]. Of this total, only a minor amount of that area is covered by water (2.06 square miles [5.32 km²]).

Using the above population and land area values, Washington County had a population density of 36.35 people per square mile [14.03 people/km²], making it the state's 30th most densely populated county (out of 99 counties).

US Census QuickFacts

The Census Bureau has created documents containing demographic information that are called QuickFacts. A QuickFact that is specific to Washington County is available. The QuickFact also contains a comparison between Washington and the state of Iowa.

Click here for the Washington County QuickFact (QF-19183).

Below are some of the communities that are located in Washington County:

(2009 Est)
(2000 Census)
Change in

Below are the counties that adjoin and form the boundaries of Washington County. A link to their specific Census QuickFact has been provided.

(2009 Est.)
(2000 Census)
Change in
HenryQF-19087   S19,92920,336-2%
IowaQF-19095   NW15,81115,6710.89%
JeffersonQF-19101   SW15,47216,181-4.38%
JohnsonQF-19103   N131,005111,00618.02%
KeokukQF-19107   W10,56211,400-7.35%
LouisaQF-19115   E11,24512,183-7.7%

Other Roadside Stops ...

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U.S. Census Bureau
Census QuickFact for Washington County

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>A Housing Unit is a broad term for those places where people live (whether occupied or temporarily vacant), such as a house, an apartment, a mobile home, or an area that is considered as a separate living quarter. Separate living quarters (consisting of one or more rooms) are considered to be those places where people live, sleep and eat separately from others and that have access to the outside (either directly or by a shared hallway).

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<3>The area value has been supplied by the US Census Bureau and it can be different than the geographic boundaries of Washington. The value given by the Census Bureau reflects their statistical (or sampling) requirements.

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<4>All Quarter-dollar coin images from the United States Mint.

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