Johnson County, IA population age distributions
A complete breakdown of Johnson County's age demographics from 0 to 85 years, distributed across 18 age groups is listed in the table below.
| Age Group | Population | % of Total Population |
|---|---|---|
| Under 5 years | 8,337 | 5.44% |
| 5 to 9 years | 8,475 | 5.53% |
| 10 to 14 years | 8,067 | 5.26% |
| 15 to 19 years | 13,535 | 8.83% |
| 20 to 24 years | 24,293 | 15.84% |
| 25 to 29 years | 12,597 | 8.21% |
| 30 to 34 years | 10,166 | 6.63% |
| 35 to 39 years | 9,815 | 6.4% |
| 40 to 44 years | 8,891 | 5.8% |
| 45 to 49 years | 7,646 | 4.99% |
| 50 to 54 years | 7,517 | 4.9% |
| 55 to 59 years | 7,218 | 4.71% |
| 60 to 64 years | 7,541 | 4.92% |
| 65 to 69 years | 6,760 | 4.41% |
| 70 to 74 years | 4,995 | 3.26% |
| 75 to 79 years | 3,369 | 2.2% |
| 80 to 84 years | 1,979 | 1.29% |
| 85 years and over | 2,159 | 1.41% |
TABLE OF CONTENTS
Johnson County, IA population by age group
Sources: U.S. Census Bureau, American Community Survey (ACS) 2018-2022
FIGURE 1
Johnson County, IA population by age group.
The largest age group is 20 to 24 years with a population of 24,293 (15.84% of the total population).
The largest age group in Johnson County, IA was for the group of age 20 to 24 years with a population of 24,293 (15.84%), according to the 2018-2022 American Community Survey.
At the same time, the smallest age group in Johnson County, IA was the 80 to 84 years with a population of 1,979 (1.29%).
Johnson County, IA population by age cohort
To better understand the age distribution of Johnson County, IA's population, we divided it into the following 3 cohorts:
- Children : Under the age of 18 years
- Adults (working population): Between the age of 18 and 64 years
- Seniors: 65 years and above
FIGURE 2
Johnson County, IA population by age cohort
The largest age group was 18 to 64 years with a population of 104,336 (68.03% of the total population).
Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:
- Johnson County 's population under 18 was 19.41%, compared to the 22.11% nationwide.
- Johnson County's working population (between 18 and 64) was 68.03%, compared to 61.36% nationwide.
- Johnson County's elderly or the senior population (over 65 age) was 12.56% as compared to 16.53% nationwide.
Johnson County, IA population pyramid
Population pyramid for Johnson County, IA is charted below using the estimates from U.S. Census Bureau's American Community Survey 5-Year estimates. A wide base suggests population increase, narrow base indicates declining birth rates.
Key stats from our analysis of the Johnson County's population pyramid:
- Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Johnson County, IA, is 22.8.
- Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Johnson County, IA, is 17.6.
- Total dependency ratio for Johnson County, IA is 40.4.
- Potential support ratio, which is the number of youth (working age population) per elderly, for Johnson County, IA is 5.7.
FIGURE 3
Johnson County, IA population pyramid
Johnson County population distrubution across age and gender. A wide base suggests population increase, narrow base indicates declining birth rates.
Johnson County, IA population pyramid
Here's the Johnson County, IA's male and female population across different age groups .
| Age Group | Population(Male) | Population(Female) | Total Population |
|---|---|---|---|
| Under 5 years | 4,402 | 3,935 | 8,337 |
| 5 to 9 years | 4,708 | 3,767 | 8,475 |
| 10 to 14 years | 3,734 | 4,333 | 8,067 |
| 15 to 19 years | 6,539 | 6,996 | 13,535 |
| 20 to 24 years | 11,860 | 12,433 | 24,293 |
| 25 to 29 years | 6,535 | 6,062 | 12,597 |
| 30 to 34 years | 5,306 | 4,860 | 10,166 |
| 35 to 39 years | 5,311 | 4,504 | 9,815 |
| 40 to 44 years | 4,380 | 4,511 | 8,891 |
| 45 to 49 years | 3,970 | 3,676 | 7,646 |
| 50 to 54 years | 3,831 | 3,686 | 7,517 |
| 55 to 59 years | 3,510 | 3,708 | 7,218 |
| 60 to 64 years | 3,747 | 3,794 | 7,541 |
| 65 to 69 years | 3,295 | 3,465 | 6,760 |
| 70 to 74 years | 2,295 | 2,700 | 4,995 |
| 75 to 79 years | 1,493 | 1,876 | 3,369 |
| 80 to 84 years | 814 | 1,165 | 1,979 |
| 85 years and over | 736 | 1,423 | 2,159 |
Things to know
What is the population of Johnson County, IA under 18?
Johnson County's population under the age of 18 is 29,762, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 19.41% of the total resident population of Johnson County, IA.
What is the aging population in Johnson County, IA?
Johnson County's population aged 65 years and above was 19,262. As per the U.S. Census Bureau's American Community Survey, this population is 12.56% of the entire population.
References
- U.S. Census Bureau American Community Survey (ACS) 2018-2022 5-Year Estimates