Boise City, ID population age distribution
A complete breakdown of Boise City'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 | 10,960 | 4.73% |
5 to 9 years | 12,063 | 5.21% |
10 to 14 years | 14,319 | 6.18% |
15 to 19 years | 15,873 | 6.86% |
20 to 24 years | 17,458 | 7.54% |
25 to 29 years | 17,649 | 7.62% |
30 to 34 years | 18,331 | 7.92% |
35 to 39 years | 17,105 | 7.39% |
40 to 44 years | 15,572 | 6.73% |
45 to 49 years | 15,058 | 6.5% |
50 to 54 years | 14,045 | 6.07% |
55 to 59 years | 15,911 | 6.87% |
60 to 64 years | 13,292 | 5.74% |
65 to 69 years | 11,858 | 5.12% |
70 to 74 years | 8,747 | 3.78% |
75 to 79 years | 5,773 | 2.49% |
80 to 84 years | 3,605 | 1.56% |
85 years and over | 3,918 | 1.69% |
TABLE OF CONTENTS
Boise City, ID population by age group
Sources: U.S. Census Bureau, American Community Survey (ACS) 2021

The largest age group in Boise City, ID was for the group of age 30-34 years with a population of 18,331 (7.92%), according to the 2021 American Community Survey.
At the same time, the smallest age group in Boise City, ID was the 80-84 years with a population of 3,605 (1.56%).
Boise City, ID population by age cohort
To better understand the age distribution of Boise City, ID'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

Here's the population for each of the three cohorts.
Age Group | Population | % of Total Population |
---|---|---|
Under 18 years | 46,211 | 19.96% |
18 to 64 years | 151,425 | 65.4% |
85 years and over | 33,901 | 14.64% |
Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:
- Boise City's population under 18 was 19.96%, compared to the 22.51% nationwide.
- Boise City's working population (between 18 and 64) was 65.40%, compared to 61.45% nationwide.
- Boise City's elderly or the senior population (over 65 age) was 14.64% as compared to 16.04% nationwide.
Boise City, ID population pyramid
Population pyramid for Boise City, ID 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 Boise City's population pyramid:
- Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Boise City, ID, is 23.3.
- Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Boise City, ID, is 21.1.
- Total dependency ratio for Boise City, ID is 44.4.
- Potential support ratio, which is the number of youth (working age population) per elderly, for Boise City, ID is 4.7.

Here's the Boise City, ID's male and female population across different age groups:
Age Group | Population(Male) | Population(Female) | Total Population |
---|---|---|---|
Under 5 years | 5,857 | 5,103 | 10,960 |
5 to 9 years | 6,025 | 6,038 | 12,063 |
10 to 14 years | 7,750 | 6,569 | 14,319 |
15 to 19 years | 7,779 | 8,094 | 15,873 |
20 to 24 years | 8,961 | 8,497 | 17,458 |
25 to 29 years | 9,480 | 8,169 | 17,649 |
30 to 34 years | 8,900 | 9,431 | 18,331 |
35 to 39 years | 8,727 | 8,378 | 17,105 |
40 to 44 years | 7,962 | 7,610 | 15,572 |
45 to 49 years | 7,984 | 7,074 | 15,058 |
50 to 54 years | 7,414 | 6,631 | 14,045 |
55 to 59 years | 7,999 | 7,912 | 15,911 |
60 to 64 years | 6,516 | 6,776 | 13,292 |
65 to 69 years | 5,446 | 6,412 | 11,858 |
70 to 74 years | 4,360 | 4,387 | 8,747 |
75 to 79 years | 2,520 | 3,253 | 5,773 |
80 to 84 years | 1,673 | 1,932 | 3,605 |
85 years and over | 1,326 | 2,592 | 3,918 |
Things to know
What is the population of Boise City, ID under 18?
Boise City's population under the age of 18 is 46,211, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 19.96% of the total resident population of Boise City, ID.
What is the aging population in Boise City, ID?
Boise City's population aged 65 years and above was 33,901. As per the U.S. Census Bureau's American Community Survey, this population is 14.64% of the entire population.
References
- U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates