Eureka, SD has a population of 898 and is the 15,818th largest city in the United States. The population density is 962 per sq mi which is 7920% higher than the South Dakota average and 962% higher than the national average. The median age in Eureka is 60 which is approximately 62% higher than the South Dakota average of 37. In Eureka, 74% of the population over 15 years of age are married, 79% speak English and 7% speak Spanish. 62% of Eureka residents were born in South Dakota, 38% were born out of state, 0% were born outside of the United States and 1% were foreign born.
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The population density in Eureka is 7920% higher than South Dakota.
The median age in Eureka is 62% higher than South Dakota.
In Eureka 98.44% of the population is White.
In Eureka 0.00% of the population is Black or African American.