Polk County, Iowa

Polk County is a United States county located in the United States of Iowa. The population of county in 2000 stood at 374601 as per the Census data. As of July 2008, the estimated population of the county is 424778, It is most populous county in Iowa. It is spread over 591.9 mi˛ (1533.01 square kilometre), of which, 569.35 square miles (1474.61 square kilometre ) of it is land and 22.55 square miles (58.4 square kilometre) of it is water, makes it the 23rd largest by total area in Iowa. It is ranks second in the size of its inland waterways in Iowa.

Polk County Iowa
Map of Polk County, Iowa

As of the census of 2000, there were 374601 residents, 149112 households, and 96601 families in the county. The population density was 657.9 people per square mile (254.02/km˛), it is the most densely populated county in the U.S. state of Iowa. There were 156447 housing units at an average density of 274.8 per square mile (106.1/km˛). The average household size was 2.45 people, and the average family size was 3.04 people. Age range in the county was well distributed with 25.7% under the age of 18, 9.4% from 18 to 24, 32.2% from 25 to 44, 21.5% from 45 to 64, and 11.1% who were 65 or older. For every 100 females there were 94.2 males. For every 100 females age 18 and over, there were 90.7 males. As of July 2008, the population was estimated at 424778, The racial makeup of the county was 379808 White, 23178 Black or African American, 2076 American Indian, 13036 Asian, 413 Native Hawaiian, and 6267 from two or more races.

Polk County Iowa Population 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
Population 2000-2008
Polk County Iowa School Enrollment
School Enrollment 2000
Polk County Iowa GDP
GDP 2000

The median income for a household in the county was $46116, making its Iowa's fourth highest county by median household income. The median income for a family in the county was $56560, making it the third wealthiest county by median family income among the Iowa. The per capita income for the county was $23654, it is the wealthiest county in terms of per capita income.

In 2000, 96530 pupils and students, of which 49.16% are male and 50.84% are female, 25.77% of the total population, are in the education system. Of which, percentage of enrollment student are in, 7.78% nursery or pri school, 5.79% kindergarten, 43.53% elementary school, 21.13% high school and 21.78% College graduate school.

RankCityCountyTotal Area mi2Land Area mi2Water Area mi2PopulationDensity mi2Per capita IncomeHouse hold Income
1Alleman CityPolk County2.482.480439176.92097066458
2Altoona CityPolk County7.17.10103451456.22033650162
3Ankeny CityPolk County16.7716.770271171616.52514355162
4Bondurant CityPolk County4.814.780.021846385.91919652877
5Clive CityPolk County, Dallas County7.337.230.11128551778.74005374127
6Des Moines CityPolk County77.2575.81.451986822621.31946738408
7Elkhart CityPolk County1.181.180362306.32039733000
8Grimes CityPolk County, Dallas County8.988.950.035098569.42371256275
9Johnston CityPolk County15.4914.351.148649602.83640776094
10Mitchellville CityPolk County, Jasper County2.32.301715746.41857245250
11Pleasant Hill CityPolk County7.947.840.115070647.12531660694
12Polk City CityPolk County2.732.720.012344862.42347658000
13Runnells CityPolk County0.420.420352830.91764341250
14Saylorville CdpPolk County8.358.3503238387.82803467197
15Urbandale CityPolk County, Dallas County20.7220.690.02290721404.92902159744
16West Des Moines CityPolk County, Dallas County, Warren County27.5726.780.79464031732.53140554139
17Windsor Heights CityPolk County1.411.41048053399.32996655931
18Sheldahl CityStory County, Polk County, Boone County0.840.840336398.51781148393
19Carlisle CityWarren County, Polk County4.334.3303497807.81946747528
YearPopulation
April 2000 census374601
April 2000 Estimate374575
July 2000 Estimate375925
July 2001 Estimate381062
July 2002 Estimate385879
July 2003 Estimate390308
July 2004 Estimate394352
July 2005 Estimate402762
July 2006 Estimate410089
July 2007 Estimate417668
July 2008 Estimate424778
SchoolMaleFemaleTotal
Nursery school386536417506
Kindergarten273428535587
Elementary school213282069042018
High school102491014820397
College or graduate school92811174121022
PlaceMedian household incomeMedian family incomePer capita income
Polk County, Iowa$46116$56560$23654
Iowa, United States$39469$48005$19674
United States$41994$50046$21587