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{{short description|County in Iowa, United States}}
{{Use mdy dates|date=
{{Infobox U.S. county
| county = Polk County
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| population_as_of = 2020
| population_total = 492401
| pop_est_as_of =
| population_est =
| population_density_sq_mi = auto
| time zone = Central
| web = https://www.polkcountyiowa.gov/
| district = 3rd
| named for = [[James K. Polk]] }}
'''Polk County''' is located in the [[U.S. state]] of [[Iowa]]. As of the [[2020 United States Census|2020 census]], the population was 492,401.<ref name="QF">{{
==History==
On January 13, 1846, the legislative body of the [[Iowa Territory]] authorized the creation of twelve counties in the Territory,<ref>The counties were Boone, Clarke, Dallas, Decatur, Jasper, Lucas, Madison, Marshall, Polk, Story, Warren, and Wayne.</ref> with general descriptions of their boundaries. On January 17 they further enacted a resolution setting the effective date of the county government for Jasper and Polk Counties as March 1, 1846.<ref>{{
The first courthouse, a two-story structure, was built in Des Moines in 1846. Rapid settlement and commercial growth in the county soon rendered this building insufficient, so construction of a larger building was initiated in 1858. Due to construction delays and the onset of the [[American Civil War|Civil War]], the structure was not completed until 1866. The present [[Polk County Courthouse (Iowa)|courthouse]] was erected in 1906, and in 1962 it was extensively renovated and enlarged.<ref>[http://www.iowacounties.org/About%20Us/AboutCoGov/County%20Pages/Polk.htm Polk County]{{dead link|date=March 2018|bot=InternetArchiveBot|fix-attempted=yes}}</ref>
==Geography==
According to the [[United States Census Bureau]], the county has a total area of {{convert|592|sqmi}}, of which {{convert|574|sqmi}} is land and {{convert|18|sqmi}} (3.0%) is water.<ref>{{
===Major highways===
Line 65 ⟶ 64:
*[[Dallas County, Iowa|Dallas]] – west
*[[Jasper County, Iowa|Jasper]] – east
*[[Madison County, Iowa|Madison]]
*[[Marion County, Iowa|Marion]] – southeast
*[[Story County, Iowa|Story]] – north
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|estyear=2023
|estimate=505255
|estref=<ref name="USCensusEst2023">{{
|align-fn=center
|footnote=U.S. Decennial Census<ref>{{
}}
[[File:PolkCountyIowaPop2020.png|thumb|right|Population of Polk County from US census data]]
===2020 census===
[[File:PolkCountyIA2022PopPyr.png|thumb|left|2022 US Census
As of the [[census]] of 2020, there were 492,401 people and 207,290 households in the county, with a population density of {{Pop density|492401|590.735872|sqmi|km2}}. 92.55% of the population reported being of one race. 66.18% were non-Hispanic White, 7.23% were Black, 9.76% were Hispanic, 0.46% were Native American, 4.98% were Asian, 0.06% were Native Hawaiian or Pacific Islander and 11.33% were some other race or more than one race. There were 210,184 housing units, of which 196,891 were occupied.
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The [[Iowa Department of Corrections]] [[Iowa Correctional Institution for Women]] is in [[Mitchellville, Iowa|Mitchellville]] and in Polk County.<ref>[http://www.doc.state.ia.us/institutions_detail.asp?id=16 Iowa Correctional Institution for Women] {{Webarchive|url=https://web.archive.org/web/20110722110655/http://www.doc.state.ia.us/institutions_detail.asp?id=16 |date=July 22, 2011}}. [[Iowa Department of Corrections]]. Retrieved November 29, 2010.</ref>
{{PresHead|place=Polk County, Iowa|
<!-- PresRow should be {{PresRow|Year|Winning party|GOP
▲{{PresHead|place=Polk County, Iowa|whig=no|source1=<ref>{{cite web|url=http://uselectionatlas.org/RESULTS|title=Dave Leip's Atlas of U.S. Presidential Elections|last=Leip|first=David|website=uselectionatlas.org|access-date=December 8, 2020}}</ref>}}
{{PresRow|2024|Democratic|112,240|140,075|4,523|Iowa}}
▲<!-- PresRow should be {{PresRow|Year|Winning party|GOP/Whig vote #|Dem vote #|3rd party vote #|State}} -->
{{PresRow|2020|Democratic|106,800|146,250|5,705|Iowa}}
{{PresRow|2016|Democratic|93,492|119,804|18,259|Iowa}}
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==Education==
School districts include:<ref>{{
* [[Ankeny Community School District]]
* [[Ballard Community School District]]
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