Eureka

County:: McPherson County
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.

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, Asian, other race and multiracial populations.

Population by Race

White

Black or African American

Two or more races

Native Hawaiian or Pacific Islander

Native American

Asian

Other race

Race	Population	Percentage (of total)
White	881	93.13%
Black or African American	38	4.02%
Two or more races	22	2.33%
Native Hawaiian or Pacific Islander	3	0.32%
Native American	2	0.21%
Asian	0	0%
Other race	0	0%

Eureka Marital Status

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