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   2025  +1 +5

2,029,733 people lived in Idaho on July 1, 2025: the 37th-largest population among the 50 states and the District of Columbia. The median age was 37.9 years (United States: 39.4); children (18.9%) and older adults (18.7%) make up similar shares of the population. There were 100.4 men for every 100 women. Since 2010 the population has grown by 29.2%. 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, 2025
Population
2,029,733
Rank by population
37th of 51
Median age
37.9
Men per 100 women
100.4
Under 15
18.9%
15–64
62.4%
65 and over
18.7%
Child dependency
30.2
Old-age dependency
29.9
Change since 2010
+29.2%
Dependency ratios count children under 15 or adults 65 and over per 100 residents aged 15 to 64.
Show the population by age group, 2025
AgeMenWomenTotalShare
0-459,65156,938116,5895.7%
5-964,85862,046126,9046.3%
10-1471,19768,541139,7386.9%
15-1974,55072,268146,8187.2%
20-2476,74269,238145,9807.2%
25-2970,03964,993135,0326.7%
30-3466,43862,886129,3246.4%
35-3965,90263,779129,6816.4%
40-4465,28864,374129,6626.4%
45-4960,93159,410120,3415.9%
50-5454,41053,876108,2865.3%
55-5952,89953,967106,8665.3%
60-6455,79259,563115,3555.7%
65-6955,92160,242116,1635.7%
70-7448,48952,730101,2195.0%
75-7936,87440,61977,4933.8%
80-8421,43225,43846,8702.3%
85+15,29822,11437,4121.8%
How Idaho compares with similar-sized states, 2025
RankStateResidentsRelative
34 Kansas 2,977,220
35 Mississippi 2,954,160
36 New Mexico 2,125,498
37 Idaho 2,029,733
38 Nebraska 2,018,006
39 West Virginia 1,766,147
40 Hawaii 1,432,820
Frequently asked questions about Idaho's population
What is the population of Idaho?
Idaho had an estimated 2,029,733 residents on July 1, 2025, according to the U.S. Census Bureau, Population Estimates Program. That ranks 37th among the 51 states and the District of Columbia.
What is the median age in Idaho?
The median age in Idaho was 37.9 years in 2025, the 44th oldest of the 51 states and DC. That is 1.5 years younger than the national median of 39.4.
How many people in Idaho are 65 or older?
About 379,157 residents of Idaho (18.7%) were 65 or older in 2025, against 18.9% under 15 and 62.4% aged 15 to 64.
What does the population pyramid of Idaho show?
In 2025, Idaho: children (18.9%) and older adults (18.7%) make up similar shares of the population. There were 100.4 men for every 100 women.
How fast is the population of Idaho changing?
The population of Idaho grew by 29.2% between 2010 and 2025, and by 1.4% in the last year.
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