Johnston

County:: Polk County
County Seat:: No
Area (mi²):: 19.49
State:: Iowa

Johnston is a city located in Polk County, Iowa. Johnston has a 2025 population of 24,992. Johnston is currently growing at a rate of 0.71% annually and its population has increased by 3.65% since the most recent census, which recorded a population of 24,111 in 2020.

The average household income in Johnston is $142,571 with a poverty rate of 7.59%. The median age in Johnston is 38.4 years: 37.8 years for males, and 39.3 years for females.

Demographics

The racial composition of Johnston includes 80.35% White, 8.6% Black or African American, 7.17% Asian, and smaller percentages for other race, Native American, Native Hawaiian or Pacific Islander and multiracial populations.

Population by Race

White

Black or African American

Asian

Two or more races

Other race

Native American

Native Hawaiian or Pacific Islander

Race	Population	Percentage (of total)
White	19,442	80.35%
Black or African American	2,081	8.6%
Asian	1,735	7.17%
Two or more races	738	3.05%
Other race	170	0.7%
Native American	30	0.12%
Native Hawaiian or Pacific Islander	0	0%

Johnston Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Johnston's average per capita income is $73,596. Household income levels show a median of $103,430. The poverty rate stands at 7.59%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.

Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.

Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.

Name	Median	Mean
Married Families	$166,201	-
Families	$143,234	$173,042
Households	$103,430	$142,571
Non Families	$58,674	$71,929

$73,596

Average Income

$103,430

Median Household Income

7.59%

Poverty Rate