U.S. state profile · SD
South Dakota: area, population and density
South Dakota has 75,809 sq mi of land and a 2025 population estimate of 935,094; calculated population density is 4.8 people/km².
Sources: U.S. Census Bureau Gazetteer Files · 2026 · U.S. Census Bureau Population Estimates Program · 2025.
South Dakota ranks 16th of 51 by land area, 46th by population and 47th by calculated population density among the U.S. states and DC. Density uses the displayed population divided by land area converted to square kilometres.
- Land area
- 75,809 sq miU.S. Census Bureau Gazetteer Files · 2026
- Population
- 935,094U.S. Census Bureau Population Estimates Program · 2025
- Calculated density
- 4.8 people/km²Population ÷ land area in km²
Reading the figures
South Dakota in the U.S. comparison set
South Dakota has 75,809 sq mi of land area and a population estimate of 935,094 for 2025. In the 51-place state and DC set, it is 16th by land area, 46th by population, and 47th by calculated density.
Density is not a separately reported value here. It is calculated from the population and land area above, converted to square kilometres, so the result can be compared with supported country figures.
U.S. boundary outline: Census TIGER/Line 2025. The drawing is fitted to this profile panel; use a comparison page for a shared-area scale.