Share of the population by age and sex, five-year groups

Population of Idaho, 2010–2025 · click to pick a year
Estimates up to 2019 are built on the 2010 Census, those from 2020 on the 2020 Census. A line that steps up or down between 2019 and 2020 reflects this re-basing, not a sudden change in population.

Year

-5 -1   2021  +1 +5

1,904,855 people lived in Idaho on July 1, 2021: the 38th-largest population among the 50 states and the District of Columbia. The median age was 37.1 years (United States: 38.9); children under 15 (20.3%) clearly outnumber residents 65 and older (17.2%): a relatively young population. There were 100.1 men for every 100 women. Since 2010 the population has grown by 21.3%. Source: U.S. Census Bureau, Population Estimates Program, Vintage 2025 estimates (resident population on July 1; public domain). Median age, shares, dependency ratios and rankings are calculated by PopulationPyramid.net from these estimates; the Census Bureau does not endorse this site.

Key indicators, 2021
Population
1,904,855
Rank by population
38th of 51
Median age
37.1
Men per 100 women
100.1
Under 15
20.3%
15–64
62.5%
65 and over
17.2%
Child dependency
32.5
Old-age dependency
27.6
Change since 2010
+21.3%
Dependency ratios count children under 15 or adults 65 and over per 100 residents aged 15 to 64.
Show the population by age group, 2021
AgeMenWomenTotalShare
0-458,80255,687114,4896.0%
5-966,86164,179131,0406.9%
10-1472,11668,802140,9187.4%
15-1970,17368,222138,3957.3%
20-2469,84565,279135,1247.1%
25-2962,48858,313120,8016.3%
30-3461,34359,256120,5996.3%
35-3961,42760,929122,3566.4%
40-4459,96858,882118,8506.2%
45-4953,12351,609104,7325.5%
50-5452,40352,434104,8375.5%
55-5953,32455,650108,9745.7%
60-6456,24759,514115,7616.1%
65-6952,31455,859108,1735.7%
70-7444,33146,90691,2374.8%
75-7928,55131,29359,8443.1%
80-8416,90119,78436,6851.9%
85+12,56319,47732,0401.7%
How Idaho compares with similar-sized states, 2021
RankStateResidentsRelative
35 Kansas 2,938,966
36 New Mexico 2,117,300
37 Nebraska 1,964,697
38 Idaho 1,904,855
39 West Virginia 1,785,921
40 Hawaii 1,446,909
41 New Hampshire 1,387,907
Frequently asked questions about Idaho's population
What is the population of Idaho?
Idaho had an estimated 1,904,855 residents on July 1, 2021, according to the U.S. Census Bureau, Population Estimates Program. That ranks 38th among the 51 states and the District of Columbia.
What is the median age in Idaho?
The median age in Idaho was 37.1 years in 2021, the 46th oldest of the 51 states and DC. That is 1.8 years younger than the national median of 38.9.
How many people in Idaho are 65 or older?
About 327,979 residents of Idaho (17.2%) were 65 or older in 2021, against 20.3% under 15 and 62.5% aged 15 to 64.
What does the population pyramid of Idaho show?
In 2021, Idaho: children under 15 (20.3%) clearly outnumber residents 65 and older (17.2%): a relatively young population. There were 100.1 men for every 100 women.
How fast is the population of Idaho changing?
The population of Idaho grew by 21.3% between 2010 and 2021, and by 3.0% in the last year.
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