Polk County IA Information


Polk County IA - Peer Comparisons by Rank and Percentile

The table below compares Polk County to the other 99 counties and county equivalents in Iowa by rank and percentile using July 1, 2014 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 1 100th
Population Density1 # 1 100th
Diversity Index2 # 7 94th
Median Household Income # 10 91st
Per Capita Income # 5 96th

Additional comparisons and rankings can be made with a VERY EASY TO USE Iowa Census Data Comparison Tool.


Polk County IA Data & Demographics (As of July 1, 2014)


Total Population 453,534
Population in Households 443,691
Population in Familes 348,430
Population in Group Qrtrs 9,843
Population Density1 790
Diversity Index2 41


Total Households 179,011
Average Household Size 2.48
Family Households 112,678
Average Family Size 3


Total Housing Units 191,741 (100%)
Owner Occupied HU 120,825 (63.0%)
Renter Occupied HU 58,186 (30.3%)
Vacant Housing Units 12,730 ( 6.6%)
Median Home Value $182,065
Average Home Value $213,063


Median Household Income $58,481
Average Household Income $75,051
Per Capita Income $29,823
  (Compound Annual Growth Rates)


2010-2014 2014-2019
Population 1.23% 1.45%
Households 1.2% 1.45%
Families 0.93% 1.29%
Median Household Income   4.34%
Per Capita Income   3.33%
1) Population Density = Total Population per square mile.
2) The Diversity Index is a scale of 0 to 100 that represents the likelyhood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.
Based on Census 2010 counts, the Diversity Index for the United States was 60.6 and it is expected to increase to 64.8 by July 1, 2018.

Information Updates

The Demographic Data for the 3,713 Iowa cities, towns, counties, ZIP Codes and Census Designated Places (CDPs) profiled in this gazetteer is updated annually. Last Update: July 1, 2014.

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The School Attendance Zone Maps for 1,427 Iowa public schools are updated four times per year. Last Update: October 6, 2014.