What is the largest city in Johnson County, KS?

Overland Park is the largest city or town in Johnson County, with about 200,306 residents.

How many ZIP codes are in Johnson County?

Johnson County includes 33 ZIP Code Tabulation Areas, including 66013, 66018, 66021, 66030, 66031.

What is the population of Johnson County, KS?

About 620,631 people live in Johnson County, based on American Community Survey 5-year estimates.

What counties border Johnson County?

Johnson County borders Jackson County, MO, Wyandotte County, Douglas County, Cass County, MO, Leavenworth County, Miami County, Franklin County.

Johnson County, KS: Cities, ZIP Codes & Local Data

Population

620,631

Land area

474sq mi

People per sq mi

1,310

ZIP codes

33

Johnson County at a glance

Johnson County is about 36 times as dense as Kansas as a whole.
No county in Kansas has more people.
The median household income is $109,208, 47% above the Kansas median of $74,275.
A typical owner-occupied home is valued at $391,200 (80% above Kansas) and median rent is $1,434 a month.
Its largest cities are Overland Park (200,306), Olathe (145,057) and Shawnee (68,542).

Local data for Johnson County, KS

Counts from official public data

Housing and community stats

Johnson County, KS, American Community Survey 2020-2024

Full profile

Median household income

$109,208

Poverty rate

5.4%

Median home value

$391,200

Prices +3.8% in a year

Median rent

$1,434/mo

Homeownership

68.5%

Bachelor's or higher

57.6%

Median age

38.6

Average commute

20.6 min

Largest reported origins and ancestries: German Americans (147,379), Irish Americans (86,670), Mexican Americans (38,316).

Home values and rents Income, education and commute

Economy and federal money

Jobs, income, federal spending and pandemic loans

Details

Unemployment rate

3.7%

Sep 2026, +0.3 pts in a year

Average annual pay

$77,972

372,167 jobs, 2025

Income per person

$95,419

BEA, 2024

Federal spending

$4.1B

FY 2026, $6,705 per person

PPP loans

$2B

21,252 loans, 208,427 jobs reported

Campaign donations

$10.7M

Itemized, 2026 cycle

Economy Federal spending PPP loans

How people get to work

Johnson County, KS, workers 16 and older. American Community Survey 5-year estimates

Drove alone69.5%
Carpooled5.9%
Public transit0.2%
Walked0.9%
Bicycle0.1%
Taxi, ride-hailing, motorcycle or other1.0%
Worked from home22.4%

Average one-way commute: 20.6 minutes for people who do not work from home.

Environment and hazard risk

Johnson County, KS, from FEMA, NOAA and EPA

Full report

Natural hazard risk

Relatively High

Top: winter weather

Storm events since 1996

1,184

Most often hail

Flood insurance policies

544

0.3% of homes, county

July high / Jan low

88° / 20°F

40.7 inches of rain a year

Hazards, floods and storm history Check a flood zone 16 historic places

Health statistics

Share of adults in Johnson County, KS, CDC PLACES estimates

All 40 measures

Obesity

31.2%

U.S. 33.3% -2.1 pts

Diabetes

9.4%

U.S. 12.1% -2.7 pts

Smoking

9.7%

U.S. 12.8% -3.1 pts

Uninsured (18-64)

6.6%

U.S. 11.1% -4.5 pts

Cities, towns and ZIP codes in Johnson County

Population shown

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Frequently asked questions

What is the largest city in Johnson County, KS?: Overland Park is the largest city or town in Johnson County, with about 200,306 residents.
How many ZIP codes are in Johnson County?: Johnson County includes 33 ZIP Code Tabulation Areas, including 66013, 66018, 66021, 66030, 66031.
What is the population of Johnson County, KS?: About 620,631 people live in Johnson County, based on American Community Survey 5-year estimates.
What counties border Johnson County?: Johnson County borders Jackson County, MO, Wyandotte County, Douglas County, Cass County, MO, Leavenworth County, Miami County, Franklin County.