Keystone Flag

Keystone

County Seat:
No
Area (mi²):
3.002
State:
South Dakota

Keystone is a town located in Pennington County, South Dakota. Keystone has a 2026 population of 261. Keystone is currently growing at a rate of 6.97% annually and its population has increased by 6.97% since the most recent census, which recorded a population of 244 in 2020.

261
Total Population
87
Density (mi²)
17 6.97%
Growth

Nearby Cities

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)