Eureka Flag

Eureka

County Seat:
No
Area (mi²):
0.933
State:
South Dakota

Eureka is a city located in McPherson County, South Dakota. Eureka has a 2025 population of 750. Eureka is currently declining at a rate of -1.45% annually and its population has decreased by -7.06% since the most recent census, which recorded a population of 807 in 2020.

The average household income in Eureka is $77,788 with a poverty rate of 16.57%.The median age in Eureka is 58.7 years: 55.1 years for males, and 59.8 years for females.

750
Total Population
804
Density (mi²)
-11 -1.45%
Growth

Eureka Population

Eureka Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of Eureka includes 93.13% White, 4.02% Black or African American, and smaller percentages for Two or more races, Native Hawaiian or Pacific Islander, Native American and multiracial populations.

Population by Race

Race
Population
Percentage (of total)
White88193.13%
Black or African American384.02%
Two or more races222.33%
Native Hawaiian or Pacific Islander30.32%
Native American20.21%

Eureka Marital Status

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

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Eureka's average per capita income is $40,441. Household income levels show a median of $34,167. The poverty rate stands at 16.57%.

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$71,667-
Families$60,481$88,220
Households$34,167$77,788
Non Families$27,049$64,875

$40,441

Average Income

$34,167

Median Household Income

16.57%

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)