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 759. Eureka is currently declining at a rate of -1.94% annually and its population has decreased by -5.83% since the most recent census, which recorded a population of 806 in 2020.

759
Total Population
814
Density (mi²)
-15 -1.94%
Growth

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)