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

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