All Johnson County population data above are from the US Census Bureau except for the population projection data, which are from the University of Kansas. Institute for Policy and Social Research. Population Projections for Kansas, by Age and Gender, 2010-2040. Selected Years. Downloaded June 2014.
With 574,272 people, Johnson County is the 1st most populated county in the state of Kansas out of 105 counties. But watch out, Johnson County, because Sedgwick County with 508,803 people and Shawnee County with 178,406 people are right behind you.
The largest Johnson County racial/ethnic groups are White (80.9%) followed by Hispanic (7.4%) and Asian (4.5%).
In 2013, the median household income of Johnson County residents was $73,737. Johnson County households made slightly more than Leavenworth County households ($68,266) and Miami County households ($58,693) . However, 5.9% of Johnson County residents live in poverty.
The median age for Johnson County residents is 36.7 years young.
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