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

Population of South Dakota, 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

896,303 people lived in South Dakota on July 1, 2021: the 46th-largest population among the 50 states and the District of Columbia. The median age was 37.8 years (United States: 38.9); children (20.4%) and older adults (18.0%) make up similar shares of the population. There were 101.2 men for every 100 women. Since 2010 the population has grown by 9.8%. 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
896,303
Rank by population
46th of 51
Median age
37.8
Men per 100 women
101.2
Under 15
20.4%
15–64
61.6%
65 and over
18.0%
Child dependency
33.1
Old-age dependency
29.2
Change since 2010
+9.8%
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
0-429,85828,71858,5766.5%
5-931,43329,91461,3476.8%
10-1432,15430,59162,7457.0%
15-1931,58229,57261,1546.8%
20-2430,92828,48759,4156.6%
25-2928,36426,31554,6796.1%
30-3429,28828,00857,2966.4%
35-3930,06827,99458,0626.5%
40-4427,42526,10553,5306.0%
45-4923,52122,47545,9965.1%
50-5424,15423,52247,6765.3%
55-5927,45827,47354,9316.1%
60-6429,43230,09159,5236.6%
65-6926,73427,31354,0476.0%
70-7421,06921,49842,5674.7%
75-7912,51914,21926,7383.0%
80-847,70310,08717,7902.0%
85+7,19313,03820,2312.3%
How South Dakota compares with similar-sized states, 2021
RankStateResidentsRelative
43 Montana 1,106,416
44 Rhode Island 1,097,381
45 Delaware 1,005,130
46 South Dakota 896,303
47 North Dakota 777,977
48 Alaska 734,590
49 District of Columbia 669,637
Frequently asked questions about South Dakota's population
What is the population of South Dakota?
South Dakota had an estimated 896,303 residents on July 1, 2021, according to the U.S. Census Bureau, Population Estimates Program. That ranks 46th among the 51 states and the District of Columbia.
What is the median age in South Dakota?
The median age in South Dakota was 37.8 years in 2021, the 39th oldest of the 51 states and DC. That is 1.1 years younger than the national median of 38.9.
How many people in South Dakota are 65 or older?
About 161,373 residents of South Dakota (18.0%) were 65 or older in 2021, against 20.4% under 15 and 61.6% aged 15 to 64.
What does the population pyramid of South Dakota show?
In 2021, South Dakota: children (20.4%) and older adults (18.0%) make up similar shares of the population. There were 101.2 men for every 100 women.
How fast is the population of South Dakota changing?
The population of South Dakota grew by 9.8% between 2010 and 2021, and by 1.0% in the last year.
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