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.
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.
|Population in Households||20,590|
|Population in Familes||17,700|
|Population in Group Qrtrs||242|
|Average Household Size||2.71|
|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)|
|Median Household Income||2.17%|
|Per Capita Income||1.89%|
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.
|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.