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 2025 population of 239. Keystone is currently declining at a rate of -0.42% annually and its population has decreased by -2.05% since the most recent census, which recorded a population of 244 in 2020.

The average household income in Keystone is $87,333 with a poverty rate of 11.14%.The median age in Keystone is 37 years: 37.5 years for males, and 35.4 years for females.

239
Total Population
80
Density (mi²)
-1 -0.42%
Growth

Keystone Population

Keystone Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of Keystone includes 89.11% White, and smaller percentages for Native American, other race, Asian and multiracial populations.

Population by Race

Race
Population
Percentage (of total)
White36089.11%
Two or more races307.43%
Native American92.23%
Other race30.74%
Asian20.5%

Keystone Marital Status

OverallMalesFemales0%10%20%30%40%50%60%70%80%90%100%

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Keystone's average per capita income is $34,219. Household income levels show a median of $62,159. The poverty rate stands at 11.14%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.
Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.
Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.
Name
Median
Mean
Married Families$62,321-
Households$62,159$87,333
Families$61,905$85,599
Non Families-$87,869

$34,219

Average Income

$62,159

Median Household Income

11.14%

Poverty Rate

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)