Johnson County, IA Population

Overview

151,833

Total Population

30.7

Median age

50.12%

Female population %

99.5:100

Gender ratio (M:F)

20-24 years

Largest age group

40.4

Total dependency ratio

White

Largest racial group

8,876

Hispanic population

Sources: U.S. Census Bureau, American Community Survey (ACS) 2021

TABLE OF CONTENTS

Age

Johnson County's population is young compared to the rest of the country:

The median age in Johnson County is 30.7, compared to 38.8 nationwide, according to the American Community Survey 2017 - 2021 5 Year estimates.
Johnson County's population under 18 was 20.00%, compared to the 22.51% nationwide.
Johnson County's elderly or the senior population (over 65 age) was 11.99% as compared to 16.04% nationwide.
Of the total population in Johnson County, 16.77% were under the age of 15, 32.23% aged 15 to 29, 39.01% aged 30 to 64, 10.68% aged 65 to 84, and 1.31% were 85 years of age and older.

There are 359 more females than males in Johnson County:

The female percentage in the USA is 50.50% while the male percentage is 49.50%, compared to 50.12% females and 49.88% males in Johnson County, IA.
The Johnson County, IA gender ratio is 99.5:100 i.e. 99.5 men to 100 women (0.995).
For male population, the largest age group is 20-24 years with a population of 11,376.
For the female population, the largest age group is 20-24 years with a population of 11,836.

Johnson County's population has become increasingly diverse:

Racial distribution of Johnson County population: 79.78% are White, 7.16% are Black or African American, 0.27% are American Indian and Alaska Native, 6.06% are Asian, 0.06% are Native Hawaiian and other Pacific Islander, 1.60% are some other race and 5.07% are multiracial.
Johnson County's racial breakdown clearly shows that there is an absolute majority of White population in the county.
By ethnicity, 8,876 is Hispanic or Latino (of any race), and 142,957 (94.15% of the total population) is Non-Hispanic.
The largest racial group in Johnson County is White with a population of 121,135 (79.78% of the total population).

Johnson County's population has not reached its peak yet and is showing a trend of further growth:

The peak population was 156,420 in the year 2022
From 2000 to 2010, Johnson County's population increased by 19,862 (17.82%), as compared to the national growth of 9.63%.
From 2010 to 2020, Johnson County's population increased by 21,698 (16.52%), according to Census Bureau's Population Estimates Program. For the same period, the rate of growth for the United States was 7.17%.
Between the year 2000 and 2022, Johnson County's population was lowest in year 2000 at 111,482.