Johnson County, Iowa Population 2024

158,141

Johnson County, Iowa's estimated 2024 population is 158,141 with a growth rate of 0.39% in the past year according to the most recent United States census data. Johnson County, Iowa is the 4th largest county in Iowa. The 2010 population was 131,344 and has seen a growth of 20.4% since that time.

Note: data after 2022 is projected based on recent change

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Year
Population
Growth
Growth Rate
2029161,2066130.38%
2028160,5936130.38%
2027159,9806130.38%
2026159,3676130.39%
2025158,7546130.39%
2024158,1416130.39%
2023157,5286130.39%
2022156,9151,8801.21%
2021155,0351,9791.29%
2020153,0565760.38%
2019152,4801,4770.98%
2018151,0031,3000.87%
2017149,7032,5361.72%
2016147,1672,0531.41%
2015145,1142,2401.57%
2014142,8742,6081.86%
2013140,2663,0862.25%
2012137,1803,0552.28%
2011134,1252,7812.12%
2010131,34400%
199096,11914,40217.62%
198081,7179,59013.3%
197072,12718,46434.41%
196053,6637,90717.28%
195045,75612,56537.86%
194033,1912,9159.63%
193030,2763,81414.41%
192026,4625482.11%
191025,9141,0974.42%
190024,8171,7357.52%
189023,082-2,347-9.23%
188025,4295312.13%
187024,8987,32541.68%
186017,57313,101292.96%
18504,4722,981199.93%
18401,491-159,715-99.08%
showing: 36 rows
2024 Growth Rate
0.39% (613)
County Website
Johnson County
State
Iowa
County Seat
2020 Population
153,056
Area
613 mi²
Density
258 people/mi²
Growth Since 2020
3.32% (5,085)
Founded
1837

Johnson County, Iowa Population 2024

Population by Race

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Race
Population
Percentage (of total)
White121,05478.93%
Black or African American11,3557.4%
Asian9,4416.16%
Two or more races8,2795.4%
Other race2,8641.87%
Native American2870.19%
Native Hawaiian or Pacific Islander800.05%

White

Black or African American

Asian

Two or more races

Other race

Native American

Native Hawaiian or Pacific Islander

Johnson County, Iowa Population by Race

Johnson County, Iowa Population Pyramid 2024

Johnson County, Iowa Median Age

30.6

Total

30.3

Male

30.9

Female

Johnson County, Iowa Adults

There are 123,598 adults, (19,262 of whom are seniors) in Johnson County, Iowa.

Johnson County, Iowa Age Dependency

47

Age Dependency Ratio

18.5

Old Age Dependency Ratio

28.5

Child Dependency Ratio

Johnson County, Iowa Sex Ratio

Female76,89450.14%
Male76,46649.86%

Johnson County, Iowa Population by Age

Johnson County, Iowa Renter vs Owner Occupied by Household Type

Household Type
Count
Average Size
Owner
Renter
All61,4142.3859.140.9
Non Family28,6601.5636.163.9
Married26,6533.0884.315.7
Female4,3273.0957.142.9
Male1,7743.1157.642.4

3.02

Average Family Size

2.38

Average Household Size

59.1%

Rate of Home Ownership

Married

Male

Female

NonFamily

owner

renter

Johnson County, Iowa Households and Families

Male

Female

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Education Attained
Count
Percentage
Less Than 9th Grade1,7321.91%
9th to 12th Grade1,8522.04%
High School Graduate14,10415.56%
Some College15,95017.59%
Associates Degree7,9478.77%
Bachelors Degree26,70729.46%
Graduate Degree22,36124.67%

Less Than 9th Grade

9th to 12th Grade

High School Graduate

Some College

Associates Degree

Bachelors Degree

Graduate Degree

Johnson County, Iowa Educational Attainment by Sex (over 25)

Johnson County, Iowa Educational Attainment by Race

High School Graduation Rate

Bachelors Rate

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Race
Total
High School
Bachelors
White72,26270,67440,878
Black5,7865,2391,384
Asian5,2004,8953,558
Hispanic4,5093,4971,543
2+ Races3,5543,3211,913
Other Race1,7111,126552
Native American19017368
Islander626023

The highest rate of high school graduation is among white people with a rate of 97.8%.

The highest rate of bachelors degrees is among asian people with a rate of 68.42%.

Johnson County, Iowa Educational Attainment by Race

All

Male

Female

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Name
Average
Male
Female
Overall$52,193$58,405$45,810
Less Than 9th Grade$28,690$39,622$12,123
High School Graduate$34,677$42,286$27,829
Some College$41,486$50,378$35,629
Bachelors Degree$55,216$62,676$46,628
Graduate Degree$74,599$79,856$69,728

$52,193

Average Earnings

$58,405

Average Male

$45,810

Average Female

Johnson County, Iowa Earnings by Educational Attainment

Johnson County, Iowa Language by Age

Only English

Spanish

Other Indo-European Languages

Asian and Pacific Island Languages

Other Languages

Johnson County, Iowa Language

84.09% of Johnson County, Iowa residents speak only English, while 15.91% speak other languages. The non-English language spoken by the largest group is Other Indo-European, which is spoken by 4.43% of the population.

Johnson County, Iowa Language

Johnson County, Iowa Poverty by Race

rate

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Name
Total
In Poverty
Poverty Rate
White111,34516,58214.89%
Black10,8822,66324.47%
Asian9,0872,22524.49%
Hispanic8,6782,14524.72%
Multiple7,9121,56219.74%
Other2,83655719.64%
Native2763713.41%
Islander733041.1%

16.88%

Overall Poverty Rate

15.59%

Male Poverty Rate

18.18%

Female Poverty Rate

Poverty in Johnson County, Iowa

The race most likely to be in poverty in Johnson County, Iowa is Islander, with 41.1% below the poverty level.

The race least likely to be in poverty in Johnson County, Iowa is Native, with 13.41% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 2.06%. Among those working part-time, it was 35.32%, and for those that did not work, the poverty rate was 23.87%.

Johnson County, Iowa Poverty

rate

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Rate
Poverty
Less Than 9th Grade18.91%
High School13.17%
Some College9.2%
Bachelors or Greater5.49%

Johnson County, Iowa Poverty Rate by Education

rate

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Rate
Poverty
Male Unemployed43.57%
Female Unemployed22.96%
Female Employed16.26%
Male Employed10.02%

Johnson County, Iowa Poverty Rate by Employment Status and Sex

Johnson County, Iowa Income by Household Type

Households

Families

MarriedFamilies

NonFamilies

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Name
Median
Mean
Households$72,977$103,328
Families$112,575$141,023
Married Families$126,336$157,636
Non Families$40,590$57,914

mean

median

Income by Household Type

Johnson County, Iowa Marital Status

Married

Widowed

Divorced

Separated

NeverMarried

Marriage Rates

44.1%

Overall Marriage Rate

45.0%

Male Marriage Rate

43.3%

Female Marriage Rate

Johnson County, Iowa Married by Age and Sex

male

female

Johnson County, Iowa Marriage

The age group where males are most likely to be married is Over 65, while the female age group most likely to be married is 35-44.

Johnson County, Iowa Marital Status by Race

Married

Widowed

Divorced

Separated

NeverMarried

Johnson County, Iowa Marital Status

Second Gulf War

First Gulf War

Vietnam

Korea

World War II

4,826

Number of Veterans

4,333

Male Veterans

493

Female Veterans

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War
Veterans
Vietnam1,600
Second Gulf War1,157
First Gulf War1,036
Korea435
World War II79

Johnson County, Iowa Veterans by War

count

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Age Group
Veterans
75+1,311
65 to 741,292
35 to 541,175
55 to 64665
18 to 34383

Johnson County, Iowa Veterans by Age

count

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Name
Veterans
% of Total
White4,5914.59%
Black1081.37%
Hispanic881.36%
2+ Races841.69%
Other Race200.87%
Asian110.14%
Native American105.05%
Islander23.23%

Johnson County, Iowa Veterans by Race

Johnson County, Iowa Veterans by Education

Less Than 9th Grade

High School Graduate

Some College

Bachelors or Greater

4.54%

Veteran Poverty Rate

18.64%

Veteran Disability Rate

Johnson County, Iowa Veterans by Education

LaborForceParticipation

69.7%

Labor Force Participation

66.9%

Employment Rate

3.8%

Unemployment Rate

Johnson County, Iowa Employment by Age

LaborForceParticipation

Johnson County, Iowa Employment by Race

LaborForceParticipation

Johnson County, Iowa Employment by Education

Origin of Non-Citizens

Europe

Asia

Africa

Oceania

Latin America

North America

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

Origin of Naturalized Citizens

Europe

Asia

Africa

Oceania

Latin America

North America

56.9%

Born in Johnson County, Iowa

89%

Native Born

11%

Foreign Born

7.18%

Non Citizen

3.82%

Naturalized

Place of Birth

89% of Johnson County, Iowa residents were born in the United States, with 56.9% having been born in Iowa. 7.18% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Asia.

Johnson County, Iowa Place of Birth

Sources