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Polk County, Iowa
Polk County Court House.jpg
Polk County Court House
Seal of Polk County, Iowa
Seal
Map of Iowa highlighting Polk County
Location in the state of Iowa
Map of the U.S. highlighting Iowa
Iowa's location in the U.S.
Founded 1846
Named for James K. Polk
Seat Des Moines
Largest city Des Moines
Area
 - Total
 - Land
 - Water

592 sq mi (1,533 km²)
574 sq mi (1,487 km²)
18 sq mi (47 km²), 3.0%
Population
 - (2020)
 - Density

492,401
751/sq mi (290/km²)
Congressional district 3rd
Time zone Central: UTC-6/-5
Website www.polkcountyiowa.gov

Polk County is a county located in the U.S. state of Iowa. As of the 2020 census, the population was 492,401,[1] making it the most populous county in Iowa. The county seat is Des Moines,[2] which is also the capital city of Iowa.

Polk County is included the Des Moines–West Des Moines, IA Metropolitan Statistical Area.[3]

History[]

Polk County was formed on January 13, 1846. It was named after President James K. Polk.

The first courthouse, a two-story structure, was built in 1846. Construction of a second courthouse was begun in 1858. Due to construction delays and the onset of the Civil War, the structure was not completed until 1866. The present courthouse was erected in 1906 in the Beaux Arts style. It was dedicated on October 31, 1906. In 1962, an extensive renovation was undertaken.[4]

Geography[]

According to the U.S. Census Bureau, the county has a total area of 592 square miles (1,530 km2), of which 574 square miles (1,490 km2) is land and 18 square miles (47 km2) (3.0%) is water.[5] The county is bisected by the Des Moines River.

Major highways[]

  • I-35 (IA).svg Interstate 35
  • I-80 (IA).svg Interstate 80
  • I-235 (IA).svg Interstate 235
  • US 6.svg U.S. Highway 6
  • US 65.svg U.S. Highway 65
  • US 69.svg U.S. Highway 69
  • Iowa 5.svg Iowa Highway 5
  • Iowa 17.svg Iowa Highway 17
  • Iowa 28.svg Iowa Highway 28
  • Iowa 141.svg Iowa Highway 141
  • Iowa 160.svg Iowa Highway 160
  • Iowa 163.svg Iowa Highway 163
  • Iowa 415.svg Iowa Highway 415

Adjacent counties[]

Demographics[]

Historical populations
Census Pop.
1850 4,513
1860 11,625 157.6%
1870 27,857 139.6%
1880 42,395 52.2%
1890 65,410 54.3%
1900 82,624 26.3%
1910 110,438 33.7%
1920 154,029 39.5%
1930 172,837 12.2%
1940 195,835 13.3%
1950 226,010 15.4%
1960 266,315 17.8%
1970 286,101 7.4%
1980 303,170 6.0%
1990 327,140 7.9%
2000 374,601 14.5%
2010 430,640 15.0%
U.S. Decennial Census[6]
1790-1960[7] 1900-1990[8]
1990-2000[9] 2010-2020[1]

2010 census[]

The 2010 census recorded a population of 430,640 in the county, with a population density of 756.371/sq mi (292.037/km2). There were 182,262 housing units, of which 170,197 were occupied.[10]

2000 census[]

2000 Census Age Pyramid for Polk County

As of the census[11] of 2000, there were 374,601 people, 149,112 households, and 96,624 families residing in the county. The population density was 658 people per square mile (254/km²). There were 156,447 housing units at an average density of 275 per square mile (106/km²). The racial makeup of the county was 88.34% White, 4.84% Black or African American, 0.27% Native American, 2.63% Asian, 0.06% Pacific Islander, 2.22% from other races, and 1.66% from two or more races. 4.40% of the population were Hispanic or Latino of any race. 25.9% were of German, 10.6% Irish, 9.0% English and 8.4% American ancestry according to Census 2000.

There were 149,112 households out of which 32.20% had children under the age of 18 living with them, 51.00% were married couples living together, 10.30% had a female householder with no husband present, and 35.20% were non-families. 28.10% of all households were made up of individuals and 8.60% had someone living alone who was 65 years of age or older. The average household size was 2.45 and the average family size was 3.04.

Age spread: 25.70% under the age of 18, 9.40% from 18 to 24, 32.20% from 25 to 44, 21.50% from 45 to 64, and 11.10% who were 65 years of age or older. The median age was 34 years. For every 100 females there were 94.20 males. For every 100 females age 18 and over, there were 90.70 males.

The median income for a household in the county was $46,116, and the median income for a family was $56,560. Males had a median income of $37,182 versus $28,000 for females. The per capita income for the county was $23,654. About 5.30% of families and 7.90% of the population were below the poverty line, including 9.70% of those under age 18 and 6.40% of those age 65 or over.

Government and Infrastructure[]

The Iowa Department of Corrections Iowa Correctional Institution for Women is located in Mitchellville and in Polk County.[12]

In the first third of the 20th century, Polk County was primarily Republican, backing its candidates in all presidential elections from 1880 to 1932 except for 1912 & 1916. From 1936 to 1980, the county was a swing county, only failing to back the national winner during that period in 1960 & 1968. Starting with the 1984 election, the county has become consistently Democratic like many midsize urban counties, backing the party's candidate in every presidential election from that point forward. Following national trends, suburbs of Des Moines such as Urbandale and Ankeny have changed from Republican strongholds into moderate or slightly progressive areas.

United States presidential election results for Polk County, Iowa[13]
Year Republican Democratic Third party
No.  % No.  % No.  %
2020 106,800 41.27% 146,250 56.52% 5,705 2.20%
2016 93,492 40.38% 119,804 51.74% 18,259 7.89%
2012 96,096 41.98% 128,465 56.13% 4,321 1.89%
2008 89,668 41.82% 120,984 56.43% 3,757 1.75%
2004 95,828 47.29% 105,218 51.93% 1,572 0.78%
2000 79,927 45.89% 89,715 51.51% 4,525 2.60%
1996 60,884 39.00% 83,877 53.73% 11,345 7.27%
1992 63,708 38.09% 78,585 46.98% 24,965 14.93%
1988 57,854 40.42% 84,476 59.01% 814 0.57%
1984 71,413 48.30% 75,413 51.01% 1,022 0.69%
1980 64,156 44.63% 61,984 43.12% 17,618 12.26%
1976 62,316 45.23% 71,917 52.20% 3,530 2.56%
1972 70,245 52.95% 59,169 44.60% 3,245 2.45%
1968 51,814 45.14% 52,731 45.94% 10,239 8.92%
1964 37,280 33.30% 74,194 66.27% 479 0.43%
1960 64,077 53.74% 55,091 46.20% 66 0.06%
1956 62,392 54.02% 53,025 45.91% 74 0.06%
1952 60,934 54.03% 50,867 45.10% 982 0.87%
1948 33,742 41.46% 45,289 55.65% 2,348 2.89%
1944 36,629 44.07% 46,072 55.43% 417 0.50%
1940 41,245 44.26% 51,647 55.42% 301 0.32%
1936 33,819 42.56% 44,274 55.72% 1,367 1.72%
1932 34,023 49.54% 31,517 45.89% 3,132 4.56%
1928 42,290 67.65% 19,725 31.55% 498 0.80%
1924 37,491 62.21% 6,665 11.06% 16,114 26.74%
1920 36,073 66.82% 16,281 30.16% 1,632 3.02%
1916 11,295 45.81% 12,327 50.00% 1,034 4.19%
1912 4,665 20.66% 7,239 32.07% 10,671 47.27%
1908 12,555 58.02% 7,924 36.62% 1,161 5.37%
1904 14,113 72.53% 3,086 15.86% 2,259 11.61%
1900 12,628 64.72% 6,180 31.67% 703 3.60%
1896 11,127 60.24% 7,087 38.37% 257 1.39%
1892 7,757 53.76% 5,538 38.38% 1,133 7.85%
1888 7,049 57.48% 4,966 40.50% 248 2.02%
1884 6,122 56.06% 4,768 43.66% 30 0.27%
1880 4,781 58.50% 2,161 26.44% 1,230 15.05%



Communities[]

Cities[]

Census-designated place[]

  • Saylorville

Unincorporated communities[]

  • Avon
  • Berwick
  • Enterprise
  • Farrar

Townships[]

  • Allen
  • Beaver
  • Bloomfield
  • Camp
  • Clay
  • Crocker
  • Delaware
  • Des Moines
  • Douglas
  • Elkhart
  • Four Mile
  • Franklin
  • Jefferson
  • Lee
  • Lincoln
  • Madison
  • Saylor
  • Union
  • Walnut
  • Washington
  • Webster


Population ranking[]

The population ranking of the following table is based on the 2010 census of Polk County.[14]

county seat

Rank City/Town/etc. Municipal type Population (2010 Census)

1 Des Moines (State Capital) (partially in Warren County) City 203,433
2 West Des Moines (partially in Dallas County) City 56,609
3 Ankeny City 45,582
4 Urbandale (partially in Dallas County) City 39,463
5 Johnston City 17,278
6 Clive (partially in Dallas County) City 15,447
7 Altoona City 14,541
8 Norwalk (mostly in Warren County) City 8,945
9 Pleasant Hill City 8,785
10 Grimes (partially in Dallas County) City 8,246
11 Windsor Heights City 4,860
12 Carlisle (partially in Warren County) City 3,876
13 Bondurant City 3,860
14 Polk City City 3,418
15 Saylorville CDP 3,301
16 Mitchellville (partially in Jasper County) City 2,254
17 Granger (partially in Dallas County) City 1,244
18 Elkhart City 683
19 Runnells City 507
20 Alleman City 432
21 Sheldahl (partially in Boone and Story Counties) City 319

See also[]

  • Polk County Courthouse
  • Iowa State Capitol
  • Terrace Hill also known as Hubbell Mansion, Benjamin F. Allen House, or the Iowa Governor's Mansion.
  • National Register of Historic Places listings in Polk County, Iowa

References[]

  1. ^ a b "State & County QuickFacts". United States Census Bureau. http://quickfacts.census.gov/qfd/states/19/19153.html. Retrieved July 20, 2014. 
  2. ^ "Find a County". National Association of Counties. http://www.naco.org/Counties/Pages/FindACounty.aspx. Retrieved 2011-06-07. 
  3. ^ United States Office of Management and Budget. "Update of Statistical Area Definitions and Guidance on Their Uses" (PDF). pp. 5, 36.. Archived from the original on 2006-05-14. https://web.archive.org/web/20060514003222/http://www.whitehouse.gov/omb/bulletins/fy2006/b06-01.pdf. Retrieved 2006-07-21. 
  4. ^ Polk County
  5. ^ "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. http://www.census.gov/geo/www/gazetteer/gazette.html. Retrieved 2011-04-23. 
  6. ^ "U.S. Decennial Census". United States Census Bureau. http://www.census.gov/prod/www/decennial.html. Retrieved July 20, 2014. 
  7. ^ "Historical Census Browser". University of Virginia Library. http://mapserver.lib.virginia.edu. Retrieved July 20, 2014. 
  8. ^ "Population of Counties by Decennial Census: 1900 to 1990". United States Census Bureau. http://www.census.gov/population/cencounts/ia190090.txt. Retrieved July 20, 2014. 
  9. ^ "Census 2000 PHC-T-4. Ranking Tables for Counties: 1990 and 2000". United States Census Bureau. http://www.census.gov/population/www/cen2000/briefs/phc-t4/tables/tab02.pdf. Retrieved July 20, 2014. 
  10. ^ "Population & Housing Occupancy Status 2010". United States Census Bureau American FactFinder. http://factfinder2.census.gov/faces/tableservices/jsf/pages/productview.xhtml?pid=DEC_10_PL_GCTPL2.ST05&prodType=table. Retrieved 2011-06-01. 
  11. ^ "American FactFinder". United States Census Bureau. http://factfinder2.census.gov. Retrieved 2008-01-31. 
  12. ^ "Iowa Correctional Institution for Women." Iowa Department of Corrections. Retrieved on November 29, 2010.
  13. ^ Leip, David. "Dave Leip's Atlas of U.S. Presidential Elections". http://uselectionatlas.org/RESULTS. 
  14. ^ http://www.census.gov/2010census/

External links[]

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Coordinates: 41°41′06″N 93°34′13″W / 41.685, -93.57028


This page uses content from the English language Wikipedia. The original content was at Polk County, Iowa. The list of authors can be seen in the page history. As with this Familypedia wiki, the content of Wikipedia is available under the Creative Commons License.
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