Johnson County is located in the state of Iowa, with a total population of 151140. The land area spans approximately 1590.377745 square miles, contributing to its total area of 1613.95069 square miles.

Johnson County Interactive Map

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About Johnson County, Iowa

Here is some important info of Johnson County, Iowa

Johnson County, Iowa Population Demographics

As of the last census, Johnson County has a total population of 151140, out of which 74890 are Male while 76250 are female.

You can check the total population for every year in the below table:

Year Population
2010 131337
2011 134086
2012 137103
2013 140151
2014 142730
2015 144943
2016 146928
2017 149325
2018 150549
2019 151140

Race Demographics

Category Percentage
non_hispanic_white_alone_male 38.5%
non_hispanic_white_alone_female 39.4%
black_alone_male 3.9%
black_alone_female 3.6%
asian_alone_male 3.1%
asian_alone_female 3.4%
hispanic_male 2.9%
hispanic_female 2.9%

Age Demographics

Category Percentage
0-4 5.8%
5-9 5.6%
10-14 5.3%
15-19 8.4%
20-24 15.4%
25-29 8.5%
30-34 6.8%
35-39 6.6%
40-44 5.6%
45-49 5.0%
50-54 4.9%
55-59 5.0%
60-64 4.9%
65-69 4.4%
70-74 3.2%
75-79 2.0%
80-84 1.3%
85+ 1.5%

Additional Information

  • Average Income: 52672
  • Number of Police officers: 299
  • Johnson County FIPS code: 19103

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Source: Census.gov, Wikipedia.org