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 and multiracial populations.

Population by Race

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%

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