Kansas·KS·FIPS 20091

Johnson County

Voted Democratic in 2024 · 343,780 votes cast

About Johnson County

Johnson County is a county in the U.S. state of Kansas, along the border of the state of Missouri. Its county seat is Olathe. As of the 2020 census, the population was 609,863, making it the most populous county in Kansas. The county was named after Thomas Johnson, a Methodist missionary who was one of the state's first settlers. Largely suburban, the county contains a number of suburbs of Kansas City, Missouri, including Overland Park, a principal city of and the second most populous city in the Kansas City Metropolitan Area.

2024 Presidential Results

All candidates · Johnson County, Kansas

Kamala D Harris(Democrat)

53.4%183,451

Won by 29,204 votes

Donald J Trump(Republican)

44.9%154,247

Other(Other)

1.1%3,750

Chase Oliver(Libertarian)

0.7%2,332

Margin History

Red = Republican, Blue = Democratic

2024D+8.5

2020D+8.2

2016R+2.6

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Swung Left in 2024

Johnson County shifted 0.2 points toward Democrats compared to 2020. Voter turnout decreased by 1.0%.

Johnson County — Local Discussion

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What does Johnson County really think?

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Election data: MIT Election Data Science Lab, Harvard Dataverse (CC BY 4.0)