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

Population of Iowa, 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

3,238,387 people lived in Iowa on July 1, 2025: the 32nd-largest population among the 50 states and the District of Columbia. The median age was 39.3 years (United States: 39.4); more residents are 65 or older (20.1%) than under 15 (18.2%): an ageing, top-heavy pyramid. There were 99.3 men for every 100 women. Since 2010 the population has grown by 6.1%. 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
3,238,387
Rank by population
32nd of 51
Median age
39.3
Men per 100 women
99.3
Under 15
18.2%
15–64
61.8%
65 and over
20.1%
Child dependency
29.4
Old-age dependency
32.5
Change since 2010
+6.1%
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
0-493,56990,393183,9625.7%
5-9100,75296,326197,0786.1%
10-14105,877101,283207,1606.4%
15-19116,790109,598226,3887.0%
20-24120,746112,828233,5747.2%
25-29102,27094,025196,2956.1%
30-34101,69497,851199,5456.2%
35-39103,253100,519203,7726.3%
40-44103,86099,801203,6616.3%
45-4994,96692,043187,0095.8%
50-5486,36185,528171,8895.3%
55-5989,33789,602178,9395.5%
60-6497,221102,238199,4596.2%
65-6994,948101,656196,6046.1%
70-7481,08988,280169,3695.2%
75-7957,80767,533125,3403.9%
80-8433,83144,16978,0002.4%
85+29,40950,93480,3432.5%
How Iowa compares with similar-sized states, 2025
RankStateResidentsRelative
29 Connecticut 3,688,496
30 Utah 3,538,904
31 Nevada 3,282,188
32 Iowa 3,238,387
33 Arkansas 3,114,791
34 Kansas 2,977,220
35 Mississippi 2,954,160
Frequently asked questions about Iowa's population
What is the population of Iowa?
Iowa had an estimated 3,238,387 residents on July 1, 2025, according to the U.S. Census Bureau, Population Estimates Program. That ranks 32nd among the 51 states and the District of Columbia.
What is the median age in Iowa?
The median age in Iowa was 39.3 years in 2025, the 33rd oldest of the 51 states and DC. That is 0.1 years younger than the national median of 39.4.
How many people in Iowa are 65 or older?
About 649,656 residents of Iowa (20.1%) were 65 or older in 2025, against 18.2% under 15 and 61.8% aged 15 to 64.
What does the population pyramid of Iowa show?
In 2025, Iowa: more residents are 65 or older (20.1%) than under 15 (18.2%): an ageing, top-heavy pyramid. There were 99.3 men for every 100 women.
How fast is the population of Iowa changing?
The population of Iowa grew by 6.1% between 2010 and 2025, and by 0.2% in the last year.
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