Eureka, SD Demographics

A map of Eureka's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	740	753	95.1%	92.6%
Multiracial	29	34	3.7%	4.2%
Native American/Other	7	12	0.9%	1.5%
Hispanic	2	11	0.3%	1.4%
Black	0	0	0.0%	0.0%
Asian	0	3	0.0%	0.4%

Eureka, South Dakota has an estimated population of 778, a decrease from the 813 recorded in the 2020 Census. The population is 95.1% White, 3.7% Multiracial, 0.9% Native American/Other, 0.3% Hispanic, 0.0% Black, and 0.0% Asian. This demographic dot map shows the population of Eureka, with one dot drawn for each person counted by the Census, color-coded by race.

Eureka has become less racially diverse since the 2020 Census. It is considerably less diverse than South Dakota overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Eureka, that probability was 14.0% in 2020 and 9.4% in the most recent ACS estimates.

Eureka is ranked the 104th most populous place in South Dakota, out of 485 places. This ranking is based on the Census definition of a place, which includes incorporated places like cities, towns, and villages, as well as unincorporated census-designated places (CDPs). Eureka was ranked the 93rd most populous place in the 2020 Census.

Eureka's White Population

740 residents of Eureka, or 95.1% of the population, identify as White. The share of White residents in Eureka is significantly higher than in South Dakota overall, where 79.8% of the population is White. Eureka ranks 168th statewide in terms of White residents as a share of the population, out of 485 places.

Since the 2020 Census, Eureka's White population has declined by an estimated 1.7%. White residents' share of Eureka's population has increased from 92.6% to 95.1%.

Eureka is more White than neighboring Hillsview (0% White), and Zeeland (89.6% White). Eureka is less White than neighboring Artas (100% White), Venturia (100% White), and Hosmer (100% White).

Eureka's Black Population

0 residents of Eureka, or 0.0% of the population, identify as Black. The share of Black residents in Eureka is slightly lower than in South Dakota overall, where 2.1% of the population is Black. Eureka ranks 183rd statewide in terms of Black residents as a share of the population, out of 485 places.

Since the 2020 Census, Eureka's Black population has grown from 0 to an estimated 0. Black residents' share of Eureka's population has remained roughly unchanged at 0.0%.

Eureka's Asian Population

0 residents of Eureka, or 0.0% of the population, identify as Asian. The share of Asian residents in Eureka is comparable to the share in South Dakota overall, where 1.4% of the population is Asian. Eureka ranks 123rd statewide in terms of Asian residents as a share of the population, out of 485 places.

Since the 2020 Census, Eureka's Asian population has declined by an estimated 100.0%. Asian residents' share of Eureka's population has remained roughly unchanged at 0.0%.

Eureka is less Asian than neighboring Zeeland (8.3% Asian).

Eureka's Hispanic Population

2 residents of Eureka, or 0.3% of the population, identify as Hispanic. The share of Hispanic residents in Eureka is slightly lower than in South Dakota overall, where 4.8% of the population is Hispanic. Eureka ranks 311th statewide in terms of Hispanic residents as a share of the population, out of 485 places.

Since the 2020 Census, Eureka's Hispanic population has declined by an estimated 81.8%. Hispanic residents' share of Eureka's population has decreased from 1.4% to 0.3%.

Eureka is more Hispanic than neighboring Hillsview (0% Hispanic), Artas (0% Hispanic), Venturia (0% Hispanic), Hosmer (0% Hispanic), and Zeeland (0% Hispanic).

Eureka's Native American/Other Population

7 residents of Eureka, or 0.9% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Eureka is lower than in South Dakota overall, where 7.5% of the population is Native American/Other. Eureka ranks 249th statewide in terms of Native American/Other residents as a share of the population, out of 485 places.

Since the 2020 Census, Eureka's Native American/Other population has declined by an estimated 41.7%. Native American/Other residents' share of Eureka's population has decreased from 1.5% to 0.9%.

Eureka is more Native American/Other than neighboring Hillsview (0% Native American/Other), Artas (0% Native American/Other), Venturia (0% Native American/Other), and Hosmer (0% Native American/Other). Eureka is less Native American/Other than neighboring Zeeland (2.1% Native American/Other).

Eureka's Multiracial Population

29 residents of Eureka, or 3.7% of the population, identify as Multiracial. The share of Multiracial residents in Eureka is comparable to the share in South Dakota overall, where 4.4% of the population is Multiracial. Eureka ranks 150th statewide in terms of Multiracial residents as a share of the population, out of 485 places.

Since the 2020 Census, Eureka's Multiracial population has declined by an estimated 14.7%. Multiracial residents' share of Eureka's population has decreased from 4.2% to 3.7%.

Eureka is more Multiracial than neighboring Hillsview (0% Multiracial), Artas (0% Multiracial), Venturia (0% Multiracial), Hosmer (0% Multiracial), and Zeeland (0% Multiracial).

Sources: Most recent population estimates are from the 2020-2024 American Community Survey 5-Year Estimates. 2020 population counts and map data are from 2020 Census State Redistricting Data. Geographic data are from Census TIGER/Line Shapefiles.