Keystone

County:: Pennington County
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.

Demographics

The racial composition of Keystone includes 89.11% White, and smaller percentages for Native American, other race, Asian, Black or African American, Native Hawaiian or Pacific Islander and multiracial populations.

Population by Race

White

Two or more races

Native American

Other race

Asian

Black or African American

Native Hawaiian or Pacific Islander

Race	Population	Percentage (of total)
White	360	89.11%
Two or more races	30	7.43%
Native American	9	2.23%
Other race	3	0.74%
Asian	2	0.5%
Black or African American	0	0%
Native Hawaiian or Pacific Islander	0	0%

Keystone Marital Status

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