Eureka Flag

Eureka

County Seat:
No
Area (mi²):
36.272
State:
South Dakota

Eureka is located in McPherson County, South Dakota. Eureka has a 2025 population of 187 . Eureka is currently growing at a rate of 0.54% annually and its population has increased by 6.25% since the most recent census, which recorded a population of 176 in 2020.

The average household income in Eureka is $116,267 with a poverty rate of 3.53%. The median age in Eureka is 44.8 years: 31 years for males, and 54.5 years for females. For every 100 females there are 325.0 males.

187
Total Population
5
Density (mi²)
1 0.54%
Growth

Eureka Population

Eureka Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of Eureka includes 100% White, and smaller percentages for and multiracial populations.

Population by Race

White (100%)

Race
Population
Percentage (of total)
White85100%

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 $44,338. Household income levels show a median of $52,583. The poverty rate stands at 3.53%.

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
Families$83,750$253,241
Married Families$83,750-
Households$52,583$116,267
Non Families$44,412-

$44,338

Average Income

$52,583

Median Household Income

3.53%

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)