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   2025  +1 +5

935,094 people lived in South Dakota on July 1, 2025: the 46th-largest population among the 50 states and the District of Columbia. The median age was 38.4 years (United States: 39.4); more residents are 65 or older (19.4%) than under 15 (19.4%): an ageing, top-heavy pyramid. There were 101.8 men for every 100 women. Since 2010 the population has grown by 14.6%. 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, 2025
Population
935,094
Rank by population
46th of 51
Median age
38.4
Men per 100 women
101.8
Under 15
19.4%
15–64
61.2%
65 and over
19.4%
Child dependency
31.7
Old-age dependency
31.6
Change since 2010
+14.6%
Dependency ratios count children under 15 or adults 65 and over per 100 residents aged 15 to 64.
Show the population by age group, 2025
AgeMenWomenTotalShare
0-429,31627,64156,9576.1%
5-930,99330,37561,3686.6%
10-1432,43130,79063,2216.8%
15-1933,65031,37565,0257.0%
20-2433,24630,48563,7316.8%
25-2931,49928,00759,5066.4%
30-3429,65128,07757,7286.2%
35-3930,50028,75559,2556.3%
40-4430,40028,83959,2396.3%
45-4927,14825,92253,0705.7%
50-5424,07923,36547,4445.1%
55-5924,78524,24849,0335.2%
60-6429,01029,42558,4356.2%
65-6928,63429,28157,9156.2%
70-7423,62024,50148,1215.1%
75-7916,18317,43133,6143.6%
80-848,89311,45420,3472.2%
85+7,59913,48621,0852.3%
How South Dakota compares with similar-sized states, 2025
RankStateResidentsRelative
43 Montana 1,144,694
44 Rhode Island 1,114,521
45 Delaware 1,059,952
46 South Dakota 935,094
47 North Dakota 799,358
48 Alaska 737,270
49 District of Columbia 693,645
Frequently asked questions about South Dakota's population
What is the population of South Dakota?
South Dakota had an estimated 935,094 residents on July 1, 2025, 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 38.4 years in 2025, the 40th oldest of the 51 states and DC. That is 1.0 years younger than the national median of 39.4.
How many people in South Dakota are 65 or older?
About 181,082 residents of South Dakota (19.4%) were 65 or older in 2025, against 19.4% under 15 and 61.2% aged 15 to 64.
What does the population pyramid of South Dakota show?
In 2025, South Dakota: more residents are 65 or older (19.4%) than under 15 (19.4%): an ageing, top-heavy pyramid. There were 101.8 men for every 100 women.
How fast is the population of South Dakota changing?
The population of South Dakota grew by 14.6% between 2010 and 2025, and by 0.9% in the last year.
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