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   2020  +1 +5

3,191,081 people lived in Iowa on July 1, 2020: the 31st-largest population among the 50 states and the District of Columbia. The median age was 38.7 years (United States: 38.7); children (19.2%) and older adults (18.1%) make up similar shares of the population. There were 98.9 men for every 100 women. Since 2010 the population has grown by 4.6%. 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, 2020
Population
3,191,081
Rank by population
31st of 51
Median age
38.7
Men per 100 women
98.9
Under 15
19.2%
15–64
62.7%
65 and over
18.1%
Child dependency
30.6
Old-age dependency
28.9
Change since 2010
+4.6%
Dependency ratios count children under 15 or adults 65 and over per 100 residents aged 15 to 64.
Show the population by age group, 2020
AgeMenWomenTotalShare
0-497,88993,904191,7936.0%
5-9104,47399,858204,3316.4%
10-14111,277105,617216,8946.8%
15-19113,489107,522221,0116.9%
20-24111,455105,429216,8846.8%
25-29100,89895,958196,8566.2%
30-34101,31498,902200,2166.3%
35-39102,69699,305202,0016.3%
40-4495,00492,406187,4105.9%
45-4988,13286,380174,5125.5%
50-5492,38390,960183,3435.7%
55-59102,554105,273207,8276.5%
60-64103,344107,102210,4466.6%
65-6991,41795,396186,8135.9%
70-7469,38176,444145,8254.6%
75-7944,83653,63898,4743.1%
80-8429,87640,06869,9442.2%
85+26,63149,87076,5012.4%
How Iowa compares with similar-sized states, 2020
RankStateResidentsRelative
28 Oklahoma 3,965,243
29 Connecticut 3,579,643
30 Utah 3,283,970
31 Iowa 3,191,081
32 Nevada 3,116,851
33 Arkansas 3,014,399
34 Mississippi 2,958,385
Frequently asked questions about Iowa's population
What is the population of Iowa?
Iowa had an estimated 3,191,081 residents on July 1, 2020, according to the U.S. Census Bureau, Population Estimates Program. That ranks 31st among the 51 states and the District of Columbia.
What is the median age in Iowa?
The median age in Iowa was 38.7 years in 2020, the 32nd oldest of the 51 states and DC. That matches the national median.
How many people in Iowa are 65 or older?
About 577,557 residents of Iowa (18.1%) were 65 or older in 2020, against 19.2% under 15 and 62.7% aged 15 to 64.
What does the population pyramid of Iowa show?
In 2020, Iowa: children (19.2%) and older adults (18.1%) make up similar shares of the population. There were 98.9 men for every 100 women.
How fast is the population of Iowa changing?
The population of Iowa grew by 4.6% between 2010 and 2020, and by 1.0% in the last year.
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