Johnson County, Iowa Population 2021

Johnson County, Iowa's estimated population is 152,322 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 5th largest county inIowa. The 2010 Population was 131,337 and has seen a growth of 15.98% since this time.

Note: 2020 and 2021 data is projected
Year Population Growth Annual Growth Rate
2021152,3225910.39%
2020151,7315910.39%
2019151,1405910.39%
2018150,5491,2240.82%
2017149,3252,3971.63%
2016146,9281,9851.37%
2015144,9432,2131.55%
2014142,7302,5791.84%
2013140,1513,0482.22%
2012137,1033,0172.25%
2011134,0862,7492.09%
2010131,33735,21836.64%
199096,11914,40217.62%
198081,7179,59013.30%
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%
18401,4910.00%
2021 Growth Rate
0.39% (591)
County Website
State
Founded
1837
County Seat
2010 Population
131,337
Growth Since 2010
15.98% (20,985)
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Johnson County, Iowa Population Growth

Population by Race

Race Population Percentage
White121,40881.71%
Black or African American10,8157.28%
Asian9,2716.24%
Two or More Races3,4542.32%
Some Other Race3,2392.18%
American Indian and Alaska Native2880.19%
Native Hawaiian and Other Pacific Islander1020.07%
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Johnson County, Iowa Population by Race

Johnson County, Iowa Population Pyramid $2021

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Johnson County, Iowa Median Age

30.3


Total

30.1


Male

30.5


Female

Johnson County, Iowa Adults

There are 118,758 adults, (16,810 of whom are seniors) in Johnson County, Iowa.

Johnson County, Iowa Age Dependency

45.7

Age Dependency Ratio

16.5

Old Age Dependency Ratio

29.2

Child Dependency Ratio

Johnson County, Iowa Sex Ratio

Female

74,965

50.46%

Male

73,612

49.54%

Johnson County, Iowa Population by Age

Johnson County, Iowa Renter vs Owner Occupied by Household Type

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Johnson County, Iowa Household Types

Type Owner Renter
Non Family36.3%63.7%
Female53.1%46.9%
Male54.2%45.8%
All58.5%41.5%
Married82.4%17.6%

58.5%

Rate of Home Ownership

Johnson County, Iowa Households and Families

Type Count Average Size Owned
All59,1342.3858.5
Non Family26,7391.5836.3
Married26,1613.0482.4
Female4,3033.0153.1
Male1,9313.1654.2

2.98

Average Family Size

2.38

Average Household Size

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Johnson County, Iowa Households by Type

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Education Attained Count Percentage
Less Than 9th Grade2,2042.52%
9th to 12th Grade2,2252.54%
High School Graduate14,24516.27%
Some College15,18317.34%
Associates Degree7,4538.51%
Bachelors Degree24,27527.73%
Graduate Degree21,95125.08%
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Johnson County, Iowa Educational Attainment by Sex (over 25)

Johnson County, Iowa Educational Attainment by Race

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Race Total High School Bachelors
White71,78769,65739,431
Black5,1714,4731,043
Asian4,9764,7623,838
Hispanic4,0652,7401,063
Other Race1,751879315
2+ Races1,2281,185771
Native American18917650
Islander6357

The highest rate of high school graduation is among white people with a rate of 97.03%.

The highest rate of bachelors degrees is among asian people with a rate of 77.13%.

Johnson County, Iowa Educational Attainment by Race

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Name Average Male Female
Overall$45,552$49,471$40,986
Less Than 9th Grade$23,227$37,222$17,486
High School Graduate$30,731$36,473$25,319
Some College$38,733$43,310$32,668
Bachelors Degree$49,366$53,890$43,254
Graduate Degree$63,563$68,017$61,142

$45,552

Average Earnings

$49,471

Average Male

$40,986

Average Female

Johnson County, Iowa Earnings by Educational Attainment

Johnson County, Iowa Language by Age

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Johnson County, Iowa Language

84.61% of Johnson County, Iowa residents speak only English, while 15.39% speak other languages. The non-English language spoken by the largest group is Asian and Pacific Island languages, which is spoken by 4.43% of the population.

Johnson County, Iowa Language

Johnson County, Iowa Poverty by Race

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Name Total In Poverty Poverty Rate
White109,98916,17714.71%
Black10,2983,43633.37%
Asian9,1013,04933.50%
Hispanic7,8501,91924.45%
Other3,1851,01531.87%
Multiple3,27369821.33%
Islander1026361.76%
Native256197.42%

18.10%

Overall Poverty Rate

17.92%

Male Poverty Rate

18.27%

Female Poverty Rate

Poverty in Johnson County, Iowa

The race most likely to be in poverty in Johnson County, Iowa is Islander, with 61.76% below the poverty level.

The race least likely to be in poverty in Johnson County, Iowa is Native, with 7.42% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 1.88%. Among those working part-time, it was 36.80%, and for those that did not work, the poverty rate was 28.04%.

Johnson County, Iowa Poverty

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Name Poverty
Less Than 9th Grade15.71%
High School12.56%
Some College9.32%
Bachelors or Greater5.81%

Johnson County, Iowa Poverty Rate by Education

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Rate Poverty
Male Unemployed53.67%
Female Unemployed50.93%
Female Employed15.73%
Male Employed11.86%

Johnson County, Iowa Poverty Rate by Employment Status and Sex

Johnson County, Iowa Income by Household Type

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Name Median Mean
Households$62,542$86,798
Families$95,047$116,162
Married Families$107,033$129,256
Non Families$34,056$49,226
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Income by Household Type

Johnson County, Iowa Marital Status

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Marriage Rates

44.6%

Overall Marriage Rate

46.0%

Male Marriage Rate

43.1%

Female Marriage Rate

Johnson County, Iowa Married by Age and Sex

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Johnson County, Iowa 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 35-44.

Johnson County, Iowa Marital Status by Race

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Johnson County, Iowa Marital Status

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5,055

Number of Veterans

4,504

Male Veterans

551

Female Veterans

War Veterans
Vietnam1,575
Second Gulf War1,027
First Gulf War1,009
Korea518
World War II199

Johnson County, Iowa Veterans by War

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Age Group Veterans
75+1,353
65 to 741,260
35 to 541,099
55 to 64733
18 to 34610

Johnson County, Iowa Veterans by Age

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Name Veterans % of Total
White4,8284.86%
Hispanic1612.78%
Black861.21%
Native American5222.03%
Asian480.63%
2+ Races351.82%
Islander66.82%

Johnson County, Iowa Veterans by Race

Johnson County, Iowa Veterans by Education

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9.87%

Veteran Poverty Rate

19.41%

Veteran Disability Rate

Johnson County, Iowa Veterans by Education

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71.6%

Labor Force Participation

69.1%

Employment Rate

3.5%

Unemployment Rate

Johnson County, Iowa Employment by Age

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Johnson County, Iowa Employment by Race

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Johnson County, Iowa 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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56.07%

Born in Johnson County, Iowa

88.05%

Native Born

11.95%

Foreign Born

8.35%

Non Citizen

3.60%

Naturalized

Place of Birth

88.05% of Johnson County, Iowa residents were born in the United States, with 56.07% having been born in Iowa. 8.35% 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

  1. US Census City/Town Population estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. Population of States and Counties of the United States: 1790 - 1990

Sources