O Brien County, IA population age distributions
A complete breakdown of O Brien 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 | 892 | 6.31% |
| 5 to 9 years | 1,031 | 7.29% |
| 10 to 14 years | 896 | 6.34% |
| 15 to 19 years | 845 | 5.98% |
| 20 to 24 years | 740 | 5.23% |
| 25 to 29 years | 885 | 6.26% |
| 30 to 34 years | 800 | 5.66% |
| 35 to 39 years | 916 | 6.48% |
| 40 to 44 years | 749 | 5.3% |
| 45 to 49 years | 682 | 4.82% |
| 50 to 54 years | 769 | 5.44% |
| 55 to 59 years | 840 | 5.94% |
| 60 to 64 years | 1,056 | 7.47% |
| 65 to 69 years | 887 | 6.27% |
| 70 to 74 years | 635 | 4.49% |
| 75 to 79 years | 373 | 2.64% |
| 80 to 84 years | 397 | 2.81% |
| 85 years and over | 745 | 5.27% |
TABLE OF CONTENTS
O Brien County, IA population by age group
Sources: U.S. Census Bureau, American Community Survey (ACS) 2018-2022
FIGURE 1
O Brien County, IA population by age group.
The largest age group is 60 to 64 years with a population of 1,056 (7.47% of the total population).
The largest age group in O Brien County, IA was for the group of age 60 to 64 years with a population of 1,056 (7.47%), according to the 2018-2022 American Community Survey.
At the same time, the smallest age group in O Brien County, IA was the 75 to 79 years with a population of 373 (2.64%).
O Brien County, IA population by age cohort
To better understand the age distribution of O Brien 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
O Brien County, IA population by age cohort
The largest age group was 18 to 64 years with a population of 7,736 (54.72% of the total population).
Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:
- O Brien County 's population under 18 was 23.80%, compared to the 22.11% nationwide.
- O Brien County's working population (between 18 and 64) was 54.72%, compared to 61.36% nationwide.
- O Brien County's elderly or the senior population (over 65 age) was 21.48% as compared to 16.53% nationwide.
O Brien County, IA population pyramid
Population pyramid for O Brien 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 O Brien County's population pyramid:
- Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for O Brien County, IA, is 34.0.
- Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for O Brien County, IA, is 36.7.
- Total dependency ratio for O Brien County, IA is 70.7.
- Potential support ratio, which is the number of youth (working age population) per elderly, for O Brien County, IA is 2.7.
FIGURE 3
O Brien County, IA population pyramid
O Brien County population distrubution across age and gender. A wide base suggests population increase, narrow base indicates declining birth rates.
O Brien County, IA population pyramid
Here's the O Brien County, IA's male and female population across different age groups .
| Age Group | Population(Male) | Population(Female) | Total Population |
|---|---|---|---|
| Under 5 years | 426 | 466 | 892 |
| 5 to 9 years | 486 | 545 | 1,031 |
| 10 to 14 years | 458 | 438 | 896 |
| 15 to 19 years | 441 | 404 | 845 |
| 20 to 24 years | 415 | 325 | 740 |
| 25 to 29 years | 444 | 441 | 885 |
| 30 to 34 years | 417 | 383 | 800 |
| 35 to 39 years | 485 | 431 | 916 |
| 40 to 44 years | 371 | 378 | 749 |
| 45 to 49 years | 349 | 333 | 682 |
| 50 to 54 years | 429 | 340 | 769 |
| 55 to 59 years | 432 | 408 | 840 |
| 60 to 64 years | 530 | 526 | 1,056 |
| 65 to 69 years | 487 | 400 | 887 |
| 70 to 74 years | 276 | 359 | 635 |
| 75 to 79 years | 176 | 197 | 373 |
| 80 to 84 years | 143 | 254 | 397 |
| 85 years and over | 242 | 503 | 745 |
Things to know
What is the population of O Brien County, IA under 18?
O Brien County's population under the age of 18 is 3,365, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 23.80% of the total resident population of O Brien County, IA.
What is the aging population in O Brien County, IA?
O Brien County's population aged 65 years and above was 3,037. As per the U.S. Census Bureau's American Community Survey, this population is 21.48% of the entire population.
References
- U.S. Census Bureau American Community Survey (ACS) 2018-2022 5-Year Estimates