In 2018, Johnson County, IA had a population of 147k people with a median age of 30 and a median household income of $61,640. Between 2017 and 2018 the population of Johnson County, IA grew from 144,425 to 147,001, a 1.78% increase and its median household income grew from $59,965 to $61,640, a 2.79% increase.
The 5 largest ethnic groups in Johnson County, IA are White (Non-Hispanic) (78.8%), Black or African American (Non-Hispanic) (6.68%), Asian (Non-Hispanic) (6.29%), White (Hispanic) (3.3%), and Two+ (Non-Hispanic) (2.07%). 0% of the households in Johnson County, IA speak a non-English language at home as their primary language, and 92% of the residents in Johnson County, IA are U.S. citizens.
In 2018, the median property value in Johnson County, IA was $216,900, and the homeownership rate was 59.7%. Most people in Johnson County, IA drove alone to work, and the average commute time was 18.3 minutes. The average car ownership in Johnson County, IA was 2 cars per household.