Rock Island County, IL population age distributions
A complete breakdown of Rock Island 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 | 8,404 | 5.88% |
| 5 to 9 years | 9,002 | 6.3% |
| 10 to 14 years | 9,269 | 6.48% |
| 15 to 19 years | 9,330 | 6.52% |
| 20 to 24 years | 8,781 | 6.14% |
| 25 to 29 years | 8,509 | 5.95% |
| 30 to 34 years | 8,703 | 6.09% |
| 35 to 39 years | 8,969 | 6.27% |
| 40 to 44 years | 8,418 | 5.89% |
| 45 to 49 years | 8,086 | 5.65% |
| 50 to 54 years | 8,270 | 5.78% |
| 55 to 59 years | 8,889 | 6.22% |
| 60 to 64 years | 9,674 | 6.77% |
| 65 to 69 years | 8,891 | 6.22% |
| 70 to 74 years | 7,800 | 5.45% |
| 75 to 79 years | 4,977 | 3.48% |
| 80 to 84 years | 3,539 | 2.47% |
| 85 years and over | 3,484 | 2.44% |
TABLE OF CONTENTS
Rock Island County, IL population by age group
Sources: U.S. Census Bureau, American Community Survey (ACS) 2019-2023
FIGURE 1
Rock Island County, IL population by age group.
The largest age group is 60 to 64 years with a population of 9,674 (6.77% of the total population).
The largest age group in Rock Island County, IL was for the group of age 60 to 64 years with a population of 9,674 (6.77%), according to the 2019-2023 American Community Survey.
At the same time, the smallest age group in Rock Island County, IL was the 85 years and over with a population of 3,484 (2.44%).
Rock Island County, IL population by age cohort
To better understand the age distribution of Rock Island County, IL'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
Rock Island County, IL population by age cohort
The largest age group was 18 to 64 years with a population of 82,081 (57.40% of the total population).
Rock Island County, IL population by age cohort
Here's the population for each of the three cohorts.
| Age Group | Population | % of Total Population |
|---|---|---|
| Under 18 years | 32,223 | 22.53% |
| 18 to 64 years | 82,081 | 57.4% |
| 65 years and over | 28,691 | 20.06% |
Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:
- Rock Island County 's population under 18 was 22.53%, compared to the 22.16% nationwide.
- Rock Island County's working population (between 18 and 64) was 57.40%, compared to 61% nationwide.
- Rock Island County's elderly or the senior population (over 65 age) was 20.06% as compared to 16.84% nationwide.
Rock Island County, IL population pyramid
Population pyramid for Rock Island County, IL 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 Rock Island County's population pyramid:
- Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Rock Island County, IL, is 30.4.
- Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Rock Island County, IL, is 32.7.
- Total dependency ratio for Rock Island County, IL is 63.2.
- Potential support ratio, which is the number of youth (working age population) per elderly, for Rock Island County, IL is 3.1.
FIGURE 3
Rock Island County, IL population pyramid
Rock Island County population distrubution across age and gender. A wide base suggests population increase, narrow base indicates declining birth rates.
Rock Island County, IL population pyramid
Here's the Rock Island County, IL's male and female population across different age groups .
| Age Group | Population(Male) | Population(Female) | Total Population |
|---|---|---|---|
| Under 5 years | 4,343 | 4,061 | 8,404 |
| 5 to 9 years | 4,663 | 4,339 | 9,002 |
| 10 to 14 years | 4,663 | 4,606 | 9,269 |
| 15 to 19 years | 4,846 | 4,484 | 9,330 |
| 20 to 24 years | 4,456 | 4,325 | 8,781 |
| 25 to 29 years | 4,187 | 4,322 | 8,509 |
| 30 to 34 years | 4,373 | 4,330 | 8,703 |
| 35 to 39 years | 4,454 | 4,515 | 8,969 |
| 40 to 44 years | 4,520 | 3,898 | 8,418 |
| 45 to 49 years | 4,139 | 3,947 | 8,086 |
| 50 to 54 years | 4,150 | 4,120 | 8,270 |
| 55 to 59 years | 4,199 | 4,690 | 8,889 |
| 60 to 64 years | 4,902 | 4,772 | 9,674 |
| 65 to 69 years | 3,892 | 4,999 | 8,891 |
| 70 to 74 years | 3,952 | 3,848 | 7,800 |
| 75 to 79 years | 2,140 | 2,837 | 4,977 |
| 80 to 84 years | 1,619 | 1,920 | 3,539 |
| 85 years and over | 1,267 | 2,217 | 3,484 |
Things to know
What is the population of Rock Island County, IL under 18?
Rock Island County's population under the age of 18 is 32,223, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 22.53% of the total resident population of Rock Island County, IL.
What is the aging population in Rock Island County, IL?
Rock Island County's population aged 65 years and above was 28,691. As per the U.S. Census Bureau's American Community Survey, this population is 20.06% of the entire population.
References
- U.S. Census Bureau American Community Survey (ACS) 2019-2023 5-Year Estimates