Demographics of Johnson County, Kansas

Johnson County, Kansas had 636,906 people on July 1, 2025, by the Census Bureau’s estimate: +25,777 since July 2020. Age, income, poverty, housing and origin below come from the American Community Survey, averaged over 2020–2024, each with its margin of error.

Johnson County, in four figures

636,906
Population: July 1, 2025, Vintage 2025 estimate.; +4.2%
Change since July 2020: +25,777 people.; 38.6 ±0.2
Median age: ACS 2020–⁠2024.; $109,208 ±$1,170
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. Each year's change is births less deaths, net moves from abroad and net moves from elsewhere in the country, with the Bureau's small residual. The 2020 row's components run 3 months, from the April census to July 1.

Johnson County, Kansas's population grew 4.2% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Johnson County, Kansas's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).

U.S. Census Bureau — Census Bureau population estimates — counties and Puerto Rico municipios, with components of change

About this chart

The figures

Johnson County, Kansas's population grew 4.2% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Johnson County, Kansas's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).
July 1	Population	Index	United States
2020	611,129	100.0	100.0
2021	615,067	100.6	100.2
2022	619,693	101.4	100.7
2023	625,261	102.3	101.6
2024	630,832	103.2	102.5
2025	636,906	104.2	103.1

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Population of Johnson County, Kansas on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	611,129	+1,264	+695	+36	+304
2021	615,067	+3,938	+1,987	+496	+846
2022	619,693	+4,626	+1,862	+1,880	+1,319
2023	625,261	+5,568	+2,301	+3,822	−496
2024	630,832	+5,571	+2,184	+4,446	−1,068
2025	636,906	+6,074	+2,179	+2,376	+1,456

Age, 2020–2024

The median age is 38.6 ±0.2: for men 37.7 ±0.2 and for women 39.4 ±0.2. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Johnson County by age, ACS 2020–2024
Age	People	Share	Kansas	United States
Under 5	36,271 ±11	5.8% ±<0.1	6.0% ±<0.1	5.6% ±<0.1
5 to 17	109,480 ±1,689	17.6% ±0.3	17.8% ±0.1	16.3% ±<0.1
18 to 24	49,586 ±1,183	8.0% ±0.2	10.2% ±0.1	9.1% ±<0.1
25 to 44	173,411 ±1,843	27.9% ±0.3	25.8% ±0.1	26.9% ±<0.1
45 to 64	152,878 ±1,595	24.6% ±0.3	23.3% ±0.1	24.8% ±<0.1
65 and over	99,005 ±2,063	16.0% ±0.3	17.0% ±0.2	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $109,208 ±$1,170, and income per person $60,137 ±$1,345, in 2024 dollars. The median is $74,275 ±$475 in Kansas and $80,734 ±$166 in the United States.

Households by income

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Households in Johnson County by income, ACS 2020–2024
Household income	Households	Share	Kansas	United States
Under $25,000	17,270 ±1,067	6.9% ±0.4	13.9% ±0.3	14.6% ±<0.1
$25,000 to $49,999	30,493 ±1,363	12.2% ±0.5	18.9% ±0.3	16.7% ±<0.1
$50,000 to $74,999	34,874 ±1,477	14.0% ±0.6	17.7% ±0.3	15.5% ±<0.1
$75,000 to $99,999	31,238 ±1,192	12.5% ±0.5	13.5% ±0.3	12.6% ±<0.1
$100,000 to $149,999	50,304 ±1,814	20.2% ±0.7	17.7% ±0.3	17.5% ±<0.1
$150,000 to $199,999	33,785 ±1,087	13.5% ±0.4	8.8% ±0.2	9.6% ±<0.1
$200,000 or more	51,567 ±1,380	20.7% ±0.5	9.6% ±0.2	13.4% ±0.1

Poverty by age

The poverty rate is the share of people whose family income is below the federal threshold for their family’s size, of everyone for whom the Bureau determines it (B17020).

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Poverty rate in Johnson County by age, ACS 2020–2024
Age	Below poverty	Rate	Kansas	United States
All ages	33,284 ±1,998	5.4% ±0.3	11.3% ±0.2	12.5% ±0.1
Under 18	7,553 ±792	5.2% ±0.5	13.1% ±0.4	16.1% ±0.1
18 to 59	18,267 ±1,167	5.4% ±0.3	11.5% ±0.2	11.6% ±0.1
60 and over	7,464 ±755	5.6% ±0.6	9.0% ±0.3	11.0% ±<0.1

Housing, 2020–2024

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Housing in Johnson County, ACS 2020–2024
Measure	Johnson County	Kansas	United States
Housing units	259,655 ±181	1,293,635 ±880	143,775,355 ±10,234
Occupied	96.1% ±0.4	90.8% ±0.3	89.9% ±0.1
Vacant	3.9% ±0.4	9.2% ±0.3	10.1% ±0.1
Owner occupied	68.5% ±0.6	67.2% ±0.4	65.2% ±0.3
Renter occupied	31.5% ±0.6	32.8% ±0.3	34.8% ±0.1
Median home value	$391,200 ±$3,069	$217,200 ±$1,343	$332,700 ±$236
Median gross rent	$1,434 ±$16	$1,060 ±$7	$1,413 ±$2
Median year built	1989 ±1	1976 ±1	1980 ±1

Occupied and vacant are shares of all housing units; owner and renter occupied are shares of occupied units. Value and rent are medians in 2024 dollars.

Origin and place of birth, 2020–2024

Hispanic or Latino origin is not a race in the Census Bureau’s tables. Here the people of Hispanic origin, of any race, are one row, and everyone else is counted by race alone (B03002), so the rows add to the whole.

Hispanic origin and race

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People in Johnson County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Kansas	United States
Hispanic or Latino	57,813 ±0	9.3% ±<0.1	13.6% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	472,604 ±1,083	76.1% ±0.2	72.7% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	29,831 ±968	4.8% ±0.2	5.2% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	32,309 ±751	5.2% ±0.1	2.9% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	600 ±146	0.1% ±<0.1	0.4% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	64 to 196	< 0.1%	0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	2,477 ±704	0.4% ±0.1	0.4% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	24,867 ±1,623	4.0% ±0.3	4.8% ±0.1	4.3% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Place of birth and citizenship

“Born a citizen outside the states” counts people born in Puerto Rico, the island areas, or abroad to American parents. Naturalized citizens and those who are not citizens together make up the people born abroad (B05002).

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People in Johnson County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Kansas	United States
Born in the state	266,423 ±3,398	42.9% ±0.5	59.2% ±0.3	57.3% ±<0.1
Born in another state	289,742 ±3,372	46.7% ±0.5	32.4% ±0.2	26.9% ±<0.1
Born a citizen outside the states	7,205 ±694	1.2% ±0.1	1.1% ±<0.1	1.7% ±<0.1
Born abroad	57,261 ±2,149	9.2% ±0.3	7.4% ±0.1	14.1% ±<0.1
Naturalized citizens	29,782 ±1,282	4.8% ±0.2	3.2% ±0.1	7.4% ±<0.1
Not citizens	27,479 ±1,807	4.4% ±0.3	4.2% ±0.1	6.8% ±<0.1

Johnson County among the counties of Kansas

1st of 105 by population, July 2025. Every one is listed on the Kansas page.

Counties of Kansas near Johnson County in population, July 2025
County	July 2025	Change since 2020
Johnson County	636,906	+4.2%
Sedgwick County	538,433	+2.6%
Shawnee County	178,607	−0.1%
Wyandotte County	170,597	+1.0%
Douglas County	120,920	+1.8%
Leavenworth County	84,590	+3.2%

Elsewhere on the site

Sources

Census Bureau population estimates — counties and Puerto Rico municipios, with components of change — U.S. Census Bureau · U.S. Government work · retrieved September 25, 2026
American Community Survey 5-year estimates — table-based Summary File · U.S. Government work

Data retrieved September 25, 2026