Johnston, IA Profile: Facts, Map & Data


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Johnston, Iowa - Basic Facts

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The City of Johnston had a population of 20,832 as of July 1, 2016. Johnston ranks in the upper quartile for Population Density and Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in Iowa. See peer rankings below.

The primary coordinate point for Johnston is located at latitude 41.6812 and longitude -93.7148 in Polk County. The formal boundaries for the City of Johnston (see map below) encompass a land area of 17.14 sq. miles and a water area of 1.21 sq. miles. Polk County is in the Central time zone (GMT -6). The elevation is 830 feet.

The City of Johnston (GNIS ID: 2395474) has a C1 Census Class Code which indicates an active incorporated place that does not serve as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

The City of Johnston is located within Township of Webster, a minor civil division (MCD) of Polk County.

Beneath the boundary map are tables with Johnston population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2016.

Neighborhood Data

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City of Johnston, IA Boundary Map

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Boundary Maps: Township of Webster | Polk County | Iowa Counties

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Johnston, IA Data & Demographics (As of July 1, 2016)


Total Population 20,832
Population in Households 20,590
Population in Familes 17,700
Population in Group Qrtrs 242
Population Density1 1,215
Diversity Index2 23


Total Households 7,602
Average Household Size 2.71
Family Households 5,511
Average Family Size 3


Total Housing Units 7,801 (100%)
Owner Occupied HU 5,869 (75.2%)
Renter Occupied HU 1,733 (22.2%)
Vacant Housing Units 199 ( 2.6%)
Median Home Value $240,055
Average Home Value $288,294


Median Household Income $96,987
Average Household Income $124,313
Per Capita Income $46,112
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population 3.04% 2.43%
Households 2.87% 2.34%
Families 2.51% 2.26%
Median Household Income   2.17%
Per Capita Income   1.89%
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.

Johnston, IA - Peer Comparisons by Rank and Percentile

The table below compares Johnston to the other 1,009 incorporated cities, towns and CDPs in Iowa by rank and percentile using July 1, 2016 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 # 23 98th
Population Density1 # 195 81st
Diversity Index2 # 107 89th
Median Household Income # 5 100th
Per Capita Income # 6 100th

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

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