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 2026 population of 735. Eureka is currently declining at a rate of -1.61% annually and its population has decreased by -8.81% since the most recent census, which recorded a population of 806 in 2020.

The median household income in Eureka is $47,583 with a poverty rate of 15.17%. The median age in Eureka is 63.1 years: 62.8 years for males, and 63.8 years for females. For every 100 females there are 88.8 males.

735
Total Population
788
Density (mi²)
-12 -1.61%
Growth

Eureka Population

Eureka Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
2026735-12-1.61%
2025747-12-1.58%
2024759-15-1.94%
2023774-25-3.13%
2022799-7-0.87%
202180600%
2020806-3-0.37%
2019830-4-0.48%
201883410.12%
2017833-3-0.36%
201683600%
2015836-9-1.07%
2014845-4-0.47%
2013849-3-0.35%
2012852-8-0.93%
2011860-8-0.92%
2010864-4-0.46%

Median Age

Overall: 63.1 years
Female: 63.8 years
Male: 62.8 years

Eureka Adults

There are 671 adults, (367 of whom are seniors) in Eureka.

Sex Ratio

Female: 412 (53%)
Male: 366 (47%)

Demographics

The racial composition of Eureka includes 95.12% White, and smaller percentages for Native Hawaiian or Pacific Islander, Native American and multiracial populations.

Population by Race

Race
Population ↓
Percentage (of total)
White74095.12%
Two or more races313.98%
Native Hawaiian or Pacific Islander40.51%
Native American30.39%
Race
Population ↓
Percentage (of total)
Two or more races20.26%
Race
Population ↓
Percentage (of total)
White74095.12%
Two or more races293.73%
Native Hawaiian or Pacific Islander40.51%
Native American30.39%

Eureka Marital Status

Economics and Income Statistics

Eureka 's average per capita income is $41,964. Household income levels show a median of $47,583. The poverty rate stands at 15.17%.

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$81,705-
Families$68,750$102,449
Households$47,583$88,841
Non Families$39,722$73,659

$41,964

Average Income

$47,583

Median Household Income

15.17%

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)