Johnston, Iowa Population 2021

23,664
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Johnston is a city located in Polk County Iowa. With a 2020 population of 23,664, it is the 22nd largest city in Iowa and the 1628th largest city in the United States . Johnston is currently growing at a rate of 2.34% annually and its population has increased by 36.96% since the most recent census, which recorded a population of 17,278 in 2010. Johnston reached it's highest population of in . Spanning over 18 miles, Johnston has a population density of 1,412 people per square mile.

The average household income in Johnston is $122,789 with a poverty rate of 4.12%. The median rental costs in recent years comes to $1,146 per month, and the median house value is $268,300. The median age in Johnston is 40.1 years, 37.9 years for males, and 41.6 years for females.

Johnston Demographics

According to the most recent ACS, the racial composition of Johnstonwas:

  • White: 90.04%
  • Asian: 4.36%
  • Black or African American: 3.16%
  • Two or more races: 2.23%
  • Other race: 0.15%
  • Native American: 0.05%
  • Native Hawaiian or Pacific Islander: 0.00%
The current population of Johnston, Iowa is 23,664 based on our projections of the latest US Census estimates. The US Census estimates the 2018 population at 22,582.The last official US Census in 2010 recorded the population at 17,278.

Johnston, Iowa Population 2021

Population by Race

Race Population Percentage
White19,27490.04%
Asian9344.36%
Black or African American6773.16%
Two or More Races4782.23%
Some Other Race330.15%
American Indian and Alaska Native100.05%
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Johnston Population by Race

Johnston Population Pyramid $2021

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Johnston Median Age

40.1


Total

37.9


Male

41.6


Female

Johnston Adults

There are 15,880 adults, (2,962 of whom are seniors) in Johnston.

Johnston Age Dependency

65.7

Age Dependency Ratio

22.9

Old Age Dependency Ratio

42.8

Child Dependency Ratio

Johnston Sex Ratio

Female

11,204

52.34%

Male

10,202

47.66%

Johnston Population by Age

Johnston Renter vs Owner Occupied by Household Type

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Johnston Household Types

Type Owner Renter
Female44.6%55.4%
Non Family49.4%50.6%
All72.5%27.5%
Male80.7%19.3%
Married89.2%10.8%

72.5%

Rate of Home Ownership

Johnston Households and Families

Type Count Average Size Owned
All8,5312.4872.5
Married4,8913.0689.2
Non Family2,5751.2249.4
Female8582.6844.6
Male2073.7480.7

2.98

Average Family Size

2.48

Average Household Size

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Johnston Households by Type

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Education Attained Count Percentage
Less Than 9th Grade380.26%
9th to 12th Grade3092.13%
High School Graduate2,33316.05%
Some College2,39116.45%
Associates Degree1,53710.57%
Bachelors Degree5,11035.15%
Graduate Degree2,81819.39%
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Johnston Educational Attainment by Sex (over 25)

Johnston Educational Attainment by Race

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Race Total High School Bachelors
White13,21012,9337,151
Asian519484362
Black401401226
Hispanic321286133
2+ Races123123104
Other Race3333
Native American1010

The highest rate of high school graduation is among black people with a rate of 100.00%.

The highest rate of bachelors degrees is among 2+ races people with a rate of 84.55%.

Johnston Educational Attainment by Race

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Name Average Male Female
Overall$64,935$72,864$52,922
Less Than 9th Grade$16,858$$16,241
High School Graduate$43,328$54,850$31,667
Some College$45,269$48,828$42,000
Bachelors Degree$76,075$92,455$58,356
Graduate Degree$81,815$100,536$76,643

$64,935

Average Earnings

$72,864

Average Male

$52,922

Average Female

Johnston Earnings by Educational Attainment

Johnston Language by Age

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Johnston Language

89.07% of Johnston residents speak only English, while 10.93% speak other languages. The non-English language spoken by the largest group is Other Indo-European, which is spoken by 6.71% of the population.

Johnston Language

Johnston Poverty by Race

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Name Total In Poverty Poverty Rate
White18,6618594.60%
Black664121.81%

4.12%

Overall Poverty Rate

4.37%

Male Poverty Rate

3.90%

Female Poverty Rate

Poverty in Johnston

The race most likely to be in poverty in Johnston is White, with 4.60% below the poverty level.

The race least likely to be in poverty in Johnston is Black, with 1.81% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 2.09%. Among those working part-time, it was 3.57%, and for those that did not work, the poverty rate was 4.95%.

Johnston Poverty

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Name Poverty
Some College6.59%
High School3.75%
Bachelors or Greater1.72%
Less Than 9th Grade0.00%

Johnston Poverty Rate by Education

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Rate Poverty
Female Unemployed6.43%
Male Employed2.63%
Female Employed1.90%
Male Unemployed0.00%

Johnston Poverty Rate by Employment Status and Sex

Johnston Income by Household Type

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Name Median Mean
Households$96,948$122,789
Families$116,361$143,049
Married Families$136,453-
Non Families$56,228$70,813
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Income by Household Type

Johnston Marital Status

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Marriage Rates

59.8%

Overall Marriage Rate

64.2%

Male Marriage Rate

55.9%

Female Marriage Rate

Johnston Married by Age and Sex

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Johnston Marriage

The age group where males are most likely to be married is 55-64, while the female age group most likely to be married is 55-64.

Johnston Marital Status by Race

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Johnston Marital Status

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853

Number of Veterans

818

Male Veterans

35

Female Veterans

War Veterans
First Gulf War272
Vietnam246
Second Gulf War199
Korea153
World War II14

Johnston Veterans by War

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Age Group Veterans
35 to 54266
75+224
65 to 74182
18 to 3493
55 to 6488

Johnston Veterans by Age

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Name Veterans % of Total
White8265.68%
2+ Races177.46%
Hispanic113.13%
Native American10100.00%

Johnston Veterans by Race

Johnston Veterans by Education

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3.93%

Veteran Poverty Rate

16.21%

Veteran Disability Rate

Johnston Veterans by Education

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76.7%

Labor Force Participation

74.6%

Employment Rate

2.4%

Unemployment Rate

Johnston Employment by Age

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Johnston Employment by Race

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Johnston Employment by Education

Origin of Non-Citizens

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Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.

Origin of Naturalized Citizens

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65.31%

Born in Johnston

90.32%

Native Born

9.68%

Foreign Born

5.09%

Non Citizen

4.59%

Naturalized

Place of Birth

90.32% of Johnston residents were born in the United States, with 65.31% having been born in Iowa. 5.09% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Europe.

Johnston Place of Birth

Note: 2020 and 2021 data is projected
Year Population Growth Annual Growth Rate
202123,6645412.34%
202023,1235412.40%
201922,5825412.45%
201822,0414942.29%
201721,5474472.12%
201621,1001,3987.10%
201519,7022061.06%
201419,4964392.30%
201319,0578404.61%
201218,2174432.49%
201117,7743942.27%
201017,3808,7317.23%
20008,6493,9476.28%
19904,7022,0856.03%
19802,6170.00%

Johnston Population by Year