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The 2009 Johnson County, IA, population is 125,692. There are 192 people per square mile (population density).
The median age is 30.5. The US median is 37.6. 48.13% of people in Johnson County, IA, are married. 7.42% are divorced.
The average household size is 2.3 people. 20.60% of people are married, with children. 5.73% have children, but are single.
88.08% of people are white, 3.26% are black, 5.83% are asian, 0.25% are native american, and 2.90% claim 'Other'.
2.61% of the people in Johnson County, IA, claim hispanic ethnicity (meaning 97.39% are non-hispanic).
Johnson, IA People data
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