Polk County (Iowa)

The Polk County is a county located in the U.S. state of Iowa. In the census in 2010, the County had 430 640 inhabitants and a population density of 292 inhabitants per square kilometer. The administrative headquarters ( County Seat) is Des Moines.

The Polk County forms the core of the metropolitan area around the city of Des Moines.


The County is located slightly south of the geographic center of Iowa and is drained by the Des Moines River. It has an area of ​​1,533 square kilometers, of which 58 square kilometers are water surface. At the Polk County borders the following counties:


Just three years before the founding of the county was Captain James Allen to the area around the city of Des Moines today to build a fort. This was named after the Des Moines River, the largest and most important rivers in the area between the rivers Mississippi and Missouri.

The settlements Brooklyn, Polk City, Dudley and Fort Des Moines decided to form a new county. 1845 deputies were sent to the Legislative Assembly of Iowa Territory who operated the determination of the boundaries of the new counties.

On January 13, 1845 Finally, a law was passed, which included the establishment of the county and the determination of its borders. Then took place on 17 January 1846, the organization of Polk County, named after President James K. Polk ( 1795-1849 ). In the same year Brooklyn was chosen as the seat of the administration, which is a part of the city of Des Moines today.

The first judicial and administrative building was also built in 1846. In 1858, work has commenced on the construction of a new building, whose construction lasted but by the Civil War until 1866. 1887-1888, the building got a new roof, a dome and an extension.

In 1900 the construction of a modern building, it was decided that was passed in 1906 its purpose. In 1962, the building was modernized.

As the building but no longer met all the requirements, in 1975 the old post office was renovated to accommodate a portion of the management there.

Demographic data

According to the census in 2010 lived in Polk County 430 640 people in 168 352 households. The population density was 292 people per square kilometer.

The racial the population was composed of 84.7 percent white, 6.0 percent African American, 0.3 percent Native American, 3.5 percent Asian and other ethnic groups; 2.4 percent were descended from two or more races. Regardless of ethnicity were 7.6 percent of the population are Hispanic or Latino of any race.

In the 168 352 households lived statistically 2.44 per person.

25.5 percent of the population were under 18 years old, 63.7 percent were between 18 and 64 and 10.8 percent were 65 years or older. 51.0 percent of the population was female.

The median income for a household was $ 56,094. The per capita income was $ 29,246. 10.3 percent of the population lived below the poverty line.

Places in Polk County


  • Alleman
  • Altoona
  • Ankeny
  • Bondurant
  • Carlisle1
  • Clive2
  • In Moines3
  • Elkhart
  • Granger2
  • Grimes2
  • Johnston
  • Mitchellville4
  • Norwalk1
  • Pleasant Hill
  • Polk City
  • Runnells
  • Sheldahl5
  • Urbandale2
  • West Des Moines3
  • Windsor Heights

Census-designated place (CDP )

  • Saylorville

Unincorporated communities

  • Adelphi
  • Adventureland Estates
  • Avon
  • Berwick
  • Camp Dodge
  • Capitol Heights
  • Carbondale
  • Carney
  • Clover Hills
  • Commerce
  • Crocker
  • East Des Moines
  • East Fourteenth
  • Farrar
  • Enterprise
  • Herrold
  • Highland Park
  • Ivy
  • Lovington
  • Lundstrom Heights
  • Marquisville
  • Norwoodville
  • Oralabor
  • Risingsun
  • Santiago
  • Saydel
  • South Des Moines
  • White Oak

1 - partly in Warren County 2 - partially in Dallas County 3 - partially in Dallas and Warren County 4 - partly in Jasper County 5 - partly in Boone and Story County


The Polk County is divided into 21 townships:

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

There is also the Saylorville Reservoir UT, a Unorganized Territory, which does not belong to the township.