Johnson County, Kansas Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 1st-largest in Kansas
The population of Johnson County, Kansas is 614,764 as of the 2023 American Community Survey, making it the 1st-largest county in Kansas. The median household income is $107,261, the median home value is $366,000, and the median age is 38.3.
The population of Johnson County has grown 15.9% since 2010 (545,681 → 632,276), a +1.06% annualized rate.
614,764
Population
+1.06%
Annual growth
1298
People / sq mi
$107,261
Median Income
$366,000
Median Home Value
Johnson County covers 474 sq mi of land at 1298.0 people per square mile.
About Johnson County, KS
Educational attainment is the headline number in Johnson County: 56.9% of adults 25 and older have a four-year degree. Johnson County is a county in Kansas with a population of 614,764. It is the #1-largest of all counties in Kansas nationally.
Income is a real outlier — the median household pulls in $107,261, putting Johnson County near the top of US counties. Hardship is rare relative to US counties: a poverty rate of just 3.4%, below the national 12.4%. Home prices are steep, with the typical property valued at $366,000, with typical rent around $1,385.
Degree attainment is near the top of the range for US counties: 56.9% of adults 25+ hold a bachelor’s, above the 35.0% national rate. Remote work is widespread — 20.0% of workers stay home, above the national 14.0%, and the average commute runs about 21 minutes each way.
The education numbers are the throughline: a college-heavy population in Johnson County usually coincides with higher incomes and a workforce concentrated in professional and information industries.
Johnson County Population History (2010-2024)
The county of Johnson County had a population of 545,681 in 2010 and 632,276 in 2024, a 15.9% growth over 14 years. The peak was 632,276 in 2024. Average annual growth rate: 1.06%.
632,276
Population (2024)
545,681
Population (2010)
632,276
Peak (2024)
1.06%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 545,681 |
| 2011 | 553,034 |
| 2012 | 559,647 |
| 2013 | 566,661 |
| 2014 | 573,322 |
| 2015 | 580,158 |
| 2016 | 586,601 |
| 2017 | 592,055 |
| 2018 | 599,045 |
| 2019 | 602,948 |
| 2020 | 611,161 |
| 2021 | 614,962 |
| 2022 | 619,311 |
| 2023 | 625,444 |
| 2024 | 632,276 |
Race & Ethnicity
| White | 80.2% |
| Black or African American | 4.9% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.4% |
| Two or More Races | 0.0% |
Age & Sex
38.3
Median Age
50.6%
Female
49.4%
Male
15.5%
Age 65+
Age Distribution
Children (under 15): 19.5% · Seniors (65+): 15.5%
Income & Poverty
| Median household income | $107,261+$34,622 vs state |
| Mean household income | $142,699 |
| Per-capita income | $58,292 |
| Poverty rate | 3.4%-4.3% vs state |
| Unemployment rate | 2.3% |
| Employment-to-population | 69.4% |
Top Industries by Employment
The largest employment sector in Johnson County is professional & business services, accounting for 23.1% of workers.
How residents commute
0.2%
Drive alone
0.9%
Carpool
72.2%
Public transit
20.0%
Work from home
20.7 min
Avg commute
Housing
$366,000+$162,600 vs state
Median home value
$1,385
Median rent
68.6%
Homeownership rate
255,320
Total housing units
95.9%
Occupied
4.1%
Vacant
31.4%
Renter-occupied
Social & access
94.9%
With health insurance
97.7%
With broadband internet
47.3%
Foreign-born
5.6%
Veterans (18+)
8.9%
With a disability
87.7%
Speak language other than English at home
Education
96.5%
High School+
56.9%
Bachelor's+
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County rankings
Common questions about Johnson County, KS
Frequently Asked Questions
Johnson County, Kansas has a population of 614,764 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 1st-largest county in Kansas. Population density is 1298 people per square mile.
The population of Johnson County has grown 15.9% since 2010 (545,681 → 632,276), a +1.06% annualized rate.
The median household income in Johnson County, Kansas is $107,261, with mean (average) household income of $142,699 and per-capita income of $58,292. 3.4% of residents live below the federal poverty level.
In Johnson County, the largest racial and ethnic groups are White (80.2%), Black or African American (4.9%), Hispanic or Latino (1.4%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Johnson County, Kansas is 38.3 years. Residents are 50.6% female and 49.4% male.
The median home value in Johnson County is $366,000 and median monthly rent is $1,385. 68.6% of occupied housing units are owner-occupied. The county has 255,320 total housing units, 4.1% of which are vacant.
The largest employment sector in Johnson County, Kansas is professional, scientific, and management services, employing 23.1% of workers. The unemployment rate is 2.3%.
Wichita is among the largest cities associated with Johnson County, Kansas, with a population of 396,488.
Johnson County, KS Climate
Johnson County, KS has an average annual temperature of 12.6°C (55°F) and receives about 1021 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
12.6°C
Avg Temp
1021
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -2° / 28° | 32 mm |
| February | 1° / 34° | 31 mm |
| March | 7° / 44° | 68 mm |
| April | 13° / 55° | 96 mm |
| May | 18° / 65° | 135 mm |
| June | 23° / 74° | 137 mm |
| July | 26° / 79° | 99 mm |
| August | 25° / 77° | 94 mm |
| September | 20° / 69° | 124 mm |
| October | 14° / 57° | 90 mm |
| November | 6° / 43° | 71 mm |
| December | 0° / 33° | 44 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Johnson County, KS
The most comfortable months to visit Johnson County, KS are typically September, August and June, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 32°C high). The coldest is January (near -8°C low). June is usually the wettest month.
Where to stay near Johnson County
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.