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   2015  +1 +5

3,122,541 people lived in Iowa on July 1, 2015: the 30th-largest population among the 50 states and the District of Columbia. The median age was 37.9 years (United States: 37.8); children under 15 (19.4%) clearly outnumber residents 65 and older (16.0%): a relatively young population. There were 98.8 men for every 100 women. Since 2010 the population has grown by 2.4%. Source: U.S. Census Bureau, Population Estimates Program, Vintage 2020 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, 2015
Population
3,122,541
Rank by population
30th of 51
Median age
37.9
Men per 100 women
98.8
Under 15
19.4%
15–64
64.5%
65 and over
16.0%
Child dependency
30.1
Old-age dependency
24.8
Change since 2010
+2.4%
Dependency ratios count children under 15 or adults 65 and over per 100 residents aged 15 to 64.
Show the population by age group, 2015
AgeMenWomenTotalShare
0-4100,78396,006196,7896.3%
5-9105,688100,978206,6666.6%
10-14103,87099,376203,2466.5%
15-19109,880104,714214,5946.9%
20-24120,979112,915233,8947.5%
25-2999,04293,144192,1866.2%
30-34102,18797,957200,1446.4%
35-3995,81992,597188,4166.0%
40-4489,51787,617177,1345.7%
45-4993,93892,081186,0196.0%
50-54104,923106,064210,9876.8%
55-59107,576108,931216,5076.9%
60-6497,01398,499195,5126.3%
65-6976,96580,804157,7695.1%
70-7452,34259,159111,5013.6%
75-7938,41047,68186,0912.8%
80-8426,98938,82565,8142.1%
85+26,15553,11779,2722.5%
How Iowa compares with similar-sized states, 2015
RankStateResidentsRelative
27 Oregon 4,018,542
28 Oklahoma 3,910,518
29 Connecticut 3,588,561
30 Iowa 3,122,541
31 Mississippi 2,990,231
32 Utah 2,983,626
33 Arkansas 2,979,732
Frequently asked questions about Iowa's population
What is the population of Iowa?
Iowa had an estimated 3,122,541 residents on July 1, 2015, according to the U.S. Census Bureau, Population Estimates Program. That ranks 30th among the 51 states and the District of Columbia.
What is the median age in Iowa?
The median age in Iowa was 37.9 years in 2015, the 27th oldest of the 51 states and DC. That is 0.1 years older than the national median of 37.8.
How many people in Iowa are 65 or older?
About 500,447 residents of Iowa (16.0%) were 65 or older in 2015, against 19.4% under 15 and 64.5% aged 15 to 64.
What does the population pyramid of Iowa show?
In 2015, Iowa: children under 15 (19.4%) clearly outnumber residents 65 and older (16.0%): a relatively young population. There were 98.8 men for every 100 women.
How fast is the population of Iowa changing?
The population of Iowa grew by 2.4% between 2010 and 2015, and by 0.4% in the last year.
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