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All Johnson County population data above are from the US Census Bureau.
The population data for Johnson County are from the Census' American Community Survey 2016 5-year estimates and the Census' 2017 Population Estimates. The demographic data for Black Hawk County, Dubuque County, Scott County, and Woodbury County are the most current, comparable demographics available from the US Census Bureau, are from the American Community Survey 2016 5-year estimates, and were downloaded on 6 December 2018. Check out our FAQ section for more details.
With 149,210 people, Johnson County is the 4th most populated county in the state of Iowa out of 99 counties. But watch out, Johnson County, because Black Hawk County with 132,648 people and Woodbury County with 102,429 people are right behind you.
The largest Johnson County racial/ethnic groups are White (80.3%) followed by Asian (6.2%) and Black (6.0%).
In 2016, the median household income of Johnson County residents was $56,808. Johnson County households made slightly more than Dubuque County households ($56,154) and Scott County households ($56,454) . However, 17.9% of Johnson County residents live in poverty.
The median age for Johnson County residents is 29.9 years young.
86% of people CANNOT find the data they're looking for on the US Census Bureau website. Source: Nielsen Norman Group
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