Johnson County, Kansas Population 2021

Johnson County, Kansas's estimated population is 610,949 with a growth rate of 0.70% in the past year according to the most recent United States census data. Johnson County, Kansas is the 2nd largest county in Kansas. The 2010 Population was 545,655 and has seen a growth of 11.97% since this time.

Note: 2020 and 2021 data is projected
Year Population Growth Growth Rate
2021610,9494,2740.70%
2020606,6754,2740.71%
2019602,4014,2740.71%
2018598,1276,8221.15%
2017591,3055,2900.90%
2016586,0156,3311.09%
2015579,6846,7441.18%
2014572,9406,5891.16%
2013566,3516,9231.24%
2012559,4286,5211.18%
2011552,9077,2521.33%
2010545,655190,60153.68%
1990355,05484,78531.37%
1980270,26952,60724.17%
1970217,66273,87051.37%
1960143,79281,009129.03%
195062,78329,45688.38%
194033,3276,14822.62%
193027,1798,86548.41%
192018,314260.14%
191018,2881841.02%
190018,1047194.14%
189017,3855323.16%
188016,8533,16923.16%
187013,6849,320213.57%
18604,3640.00%
2021 Growth Rate
0.70%
County Website
State
Founded
August 25, 1855
County Seat
2010 Population
545,655
Growth Since 2010
11.97%
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Johnson County, Kansas Population Growth

Population by Race

Race Population Percentage
White508,40985.95%
Asian30,0875.09%
Black or African American27,7034.68%
Two or More Races17,0762.89%
Some Other Race6,3851.08%
American Indian and Alaska Native1,5410.26%
Native Hawaiian and Other Pacific Islander3050.05%
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Johnson County, Kansas Population by Race

Johnson County, Kansas Population Pyramid $2021

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Johnson County, Kansas Median Age

37.6


Total

36.6


Male

38.6


Female

Johnson County, Kansas Adults

There are 445,914 adults, (83,169 of whom are seniors) in Johnson County, Kansas.

Johnson County, Kansas Age Dependency

63.1

Age Dependency Ratio

22.9

Old Age Dependency Ratio

40.1

Child Dependency Ratio

Johnson County, Kansas Sex Ratio

Female

301,408

50.96%

Male

290,098

49.04%

Johnson County, Kansas Population by Age

Johnson County, Kansas Renter vs Owner Occupied by Household Type

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Johnson County, Kansas Household Types

Type Owner Renter
Married85.9%14.1%
All69.2%30.8%
Male54.9%45.1%
Female49.5%50.5%
Non Family46.6%53.4%

69.2%

Rate of Home Ownership

Johnson County, Kansas Households and Families

Type Count Average Size Owned
All228,5922.5769.2
Married128,4713.1985.9
Non Family72,4571.2546.6
Female19,4593.0749.5
Male8,2053.3354.9

3.12

Average Family Size

2.57

Average Household Size

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Johnson County, Kansas Households by Type

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Education Attained Count Percentage
Less Than 9th Grade6,1961.55%
9th to 12th Grade9,9342.49%
High School Graduate57,70614.46%
Some College72,18618.08%
Associates Degree29,6937.44%
Bachelors Degree138,25534.64%
Graduate Degree85,20721.35%
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Johnson County, Kansas Educational Attainment by Sex (over 25)

Johnson County, Kansas Educational Attainment by Race

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Race Total High School Bachelors
White331,514324,605193,264
Hispanic23,79717,7216,532
Asian20,23518,59613,886
Black17,37016,1136,530
2+ Races6,2245,9953,264
Other Race4,1032,897764
Native American971876313
Islander11710937

The highest rate of high school graduation is among white people with a rate of 97.92%.

The highest rate of bachelors degrees is among asian people with a rate of 68.62%.

Johnson County, Kansas Educational Attainment by Race

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Name Average Male Female
Overall$52,641$64,456$43,187
Less Than 9th Grade$26,712$31,962$19,935
High School Graduate$32,426$39,995$26,845
Some College$41,857$50,212$35,575
Bachelors Degree$61,456$79,358$47,490
Graduate Degree$75,440$96,220$60,759

$52,641

Average Earnings

$64,456

Average Male

$43,187

Average Female

Johnson County, Kansas Earnings by Educational Attainment

Johnson County, Kansas Language by Age

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Johnson County, Kansas Language

88.11% of Johnson County, Kansas residents speak only English, while 11.89% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 4.95% of the population.

Johnson County, Kansas Language

Johnson County, Kansas Poverty by Race

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Name Total In Poverty Poverty Rate
White468,44617,7723.79%
Hispanic44,6476,06813.59%
Black27,1903,85214.17%
Asian30,0032,3107.70%
Multiple16,8451,6069.53%
Other6,32399815.78%
Native1,479896.02%

5.37%

Overall Poverty Rate

4.61%

Male Poverty Rate

6.09%

Female Poverty Rate

Poverty in Johnson County, Kansas

The race most likely to be in poverty in Johnson County, Kansas is Other, with 15.78% below the poverty level.

The race least likely to be in poverty in Johnson County, Kansas is White, with 3.79% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 1.20%. Among those working part-time, it was 8.04%, and for those that did not work, the poverty rate was 10.37%.

Johnson County, Kansas Poverty

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Name Poverty
Less Than 9th Grade15.68%
High School7.50%
Some College6.04%
Bachelors or Greater2.17%

Johnson County, Kansas Poverty Rate by Education

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Rate Poverty
Female Unemployed25.47%
Male Unemployed10.08%
Female Employed3.70%
Male Employed2.34%

Johnson County, Kansas Poverty Rate by Employment Status and Sex

Johnson County, Kansas Income by Household Type

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Name Median Mean
Households$89,087$118,415
Families$109,437$141,228
Married Families$122,638$155,959
Non Families$50,583$66,131
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Income by Household Type

Johnson County, Kansas Marital Status

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Marriage Rates

56.9%

Overall Marriage Rate

58.7%

Male Marriage Rate

55.2%

Female Marriage Rate

Johnson County, Kansas Married by Age and Sex

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Johnson County, Kansas 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, Kansas Marital Status by Race

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Johnson County, Kansas Marital Status

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28,353

Number of Veterans

26,660

Male Veterans

1,693

Female Veterans

War Veterans
Vietnam9,792
First Gulf War6,113
Second Gulf War5,119
Korea2,825
World War II1,267

Johnson County, Kansas Veterans by War

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Age Group Veterans
75+7,640
65 to 747,393
35 to 546,847
55 to 644,226
18 to 342,247

Johnson County, Kansas Veterans by Age

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Name Veterans % of Total
White26,3296.78%
Black1,0435.16%
Hispanic1,0073.52%
2+ Races3804.72%
Asian3231.40%
Other Race1633.45%
Native American11110.31%
Islander42.14%

Johnson County, Kansas Veterans by Race

Johnson County, Kansas Veterans by Education

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4.16%

Veteran Poverty Rate

26.73%

Veteran Disability Rate

Johnson County, Kansas Veterans by Education

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71.9%

Labor Force Participation

69.7%

Employment Rate

2.9%

Unemployment Rate

Johnson County, Kansas Employment by Age

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Johnson County, Kansas Employment by Race

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Johnson County, Kansas 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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41.86%

Born in Johnson County, Kansas

91.14%

Native Born

8.86%

Foreign Born

4.67%

Non Citizen

4.18%

Naturalized

Place of Birth

91.14% of Johnson County, Kansas residents were born in the United States, with 41.86% having been born in Kansas. 4.67% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Asia.

Johnson County, Kansas 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