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The Commemorative Quarter for Iowa

The 2000 Census showed that Mahaska County had a population of 22,335 people. This represented 0.76% of the total population of Iowa, making it the state's 27th most populous county (out of 99 counties).

From the Census Estimates for 2009<1>, Mahaska had a population of 22,000 people. This is a decrease of 1.5% 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
201022,381+0.21%+1.73% since 2009
200922,000-1.5%-0.54% since 2008
200822,120-0.96%+0.13% since 2007
200722,092-1.09%+0.24% since 2006
200622,039-1.33%-0.81% since 2005
200522,220-0.51%+0.73% since 2004
200422,060-1.23%+0.18% since 2003
200322,021-1.41%-1.29% since 2002
200222,309-0.12%-0.31% since 2001
200122,378+0.19%+0.19% since 2000
200022,335The Last Census

Mahaska County had 9,551 Housing Units<2> at the time of the 2000 Census.

The 2000 Census shows that Mahaska County has a total area<3> of 573 square miles [1,485 km²]. Of this total, only a minor amount of that area is covered by water (2.53 square miles [6.55 km²]).

Using the above population and land area values, Mahaska County had a population density of 39.12 people per square mile [15.11 people/km²], making it the state's 27th 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 Mahaska County is available. The QuickFact also contains a comparison between Mahaska and the state of Iowa.

Click here for the Mahaska County QuickFact (QF-19123).

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

(2009 Est)
(2000 Census)
Change in

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

(2009 Est.)
(2000 Census)
Change in
JasperQF-19099   NW36,25737,213-2.57%
KeokukQF-19107   E10,56211,400-7.35%
MarionQF-19125   W32,68232,0521.97%
MonroeQF-19135   SW7,5498,016-5.83%
PoweshiekQF-19157   N18,42318,815-2.08%
WapelloQF-19179   SE35,33436,051-1.99%

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U.S. Census Bureau
Census QuickFact for Mahaska 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 Mahaska. 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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