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Johnson County Population

All Johnson County population data above are from the US Census Bureau.

Johnson County Demographics Summary

population icon Population

With 146,547 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 132,904 people and Woodbury County with 102,779 people are right behind you.

race icon Race & Ethnicity

The largest Johnson County racial/ethnic groups are White (81.1%) followed by Asian (6.0%) and Black (5.4%).

income icon Median Income

In 2015, the median household income of Johnson County residents was $55,700. Johnson County households made slightly more than O'Brien County households ($55,227) and Tama County households ($55,203) . However, 17.9% of Johnson County residents live in poverty.

age icon Median Age

The median age for Johnson County residents is 29.8 years young.

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The population data for Johnson County are from the Census 2000, Census 2010, the Census' American Community Survey 2015 5-year estimates and the Census' 2016 Population Estimates. The demographic data for Black Hawk County, O'Brien County, Tama County, and Woodbury County are the most current, comparable demographics available from the US Census Bureau, are from the American Community Survey 2015 5-year estimates, and were downloaded on December 2016. Check out our FAQ section for more details.


Starter Report Sample

The District of Columbia Starter Report, shown on the left, will give you a good idea of what to expect in a Starter Report. The Johnson County, IA report will have the same data, charts & graphs as this sample.

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