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 269. Keystone is currently growing at a rate of 1.51% annually and its population has increased by 10.25% since the most recent census, which recorded a population of 244 in 2020.

The median household income in Keystone is $64,702 with a poverty rate of 6.85%. The median age in Keystone is 38.1 years: 38.2 years for males, and 37.6 years for females. For every 100 females there are 127.0 males.

269
Total Population
90
Density (mi²)
4 1.51%
Growth

Keystone Population

Keystone Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
202626941.51%
202526541.53%
2024261176.97%
2023244-1-0.41%
2022245-1-0.41%
202124620.82%
202024410.41%
201934541.17%
201834120.59%
2017339-1-0.29%
201634000%
2015340-1-0.29%
2014341-1-0.29%
201334220.59%
201234051.49%
2011335-2-0.59%
201033400%

Median Age

Overall: 38.1 years
Female: 37.6 years
Male: 38.2 years

Keystone Adults

There are 238 adults, (45 of whom are seniors) in Keystone.

Sex Ratio

Female: 148 (44%)
Male: 188 (56%)

Demographics

The racial composition of Keystone includes 84.52% White, and smaller percentages for other race, Asian, Native American and multiracial populations.

Population by Race

Race
Population ↓
Percentage (of total)
White28484.52%
Two or more races3911.61%
Other race102.98%
Asian20.6%
Native American10.3%
Race
Population ↓
Percentage (of total)
White7020.83%
Other race82.38%
Two or more races20.6%
Race
Population ↓
Percentage (of total)
White21463.69%
Two or more races3711.01%
Other race20.6%
Asian20.6%
Native American10.3%

Keystone Marital Status

Economics and Income Statistics

Keystone 's average per capita income is $36,667. Household income levels show a median of $64,702. The poverty rate stands at 6.85%.

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$73,750-
Families$64,875$93,233
Households$64,702$83,955
Non Families$34,250$50,456

$36,667

Average Income

$64,702

Median Household Income

6.85%

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)