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 747 . Eureka is currently declining at a rate of -1.58% annually and its population has decreased by -7.32% since the most recent census, which recorded a population of 806 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. For every 100 females there are 86.2 males.

747
Total Population
801
Density (mi²)
-12 -1.58%
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

White (93.13%)

Black or African American (4.02%)

Two or more races (2.33%)

Native Hawaiian or Pacific Islander (0.32%)

Native American (0.21%)

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)