Eureka, MT Demographics

A map of Eureka's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	1,640	1,195	89.1%	86.6%
Multiracial	118	73	6.4%	5.3%
Hispanic	53	84	2.9%	6.1%
Native American/Other	29	18	1.6%	1.3%
Black	0	3	0.0%	0.2%
Asian	0	7	0.0%	0.5%

Eureka, Montana has an estimated population of 1,840, a dramatic increase from the 1,380 recorded in the 2020 Census. The population is 89.1% White, 6.4% Multiracial, 2.9% Hispanic, 1.6% Native American/Other, 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 Montana 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 24.3% in 2020 and 20.0% in the most recent ACS estimates.

Eureka is ranked the 62nd most populous place in Montana, out of 497 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 75th most populous place in the 2020 Census.

Eureka's White Population

1,640 residents of Eureka, or 89.1% of the population, identify as White. The share of White residents in Eureka is higher than in Montana overall, where 83.6% of the population is White. Eureka ranks 322nd statewide in terms of White residents as a share of the population, out of 497 places.

Since the 2020 Census, Eureka's White population has grown by an estimated 37.2%. White residents' share of Eureka's population has increased from 86.6% to 89.1%.

Eureka is more White than neighboring Indian Springs (0% White), Rexford (80.6% White), and Trego (88.4% White). Eureka is less White than neighboring Fortine (90% White), and West Kootenai (95.5% 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 comparable to the share in Montana overall, where 0.4% of the population is Black. Eureka ranks 135th statewide in terms of Black residents as a share of the population, out of 497 places.

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

Eureka is less Black than neighboring Trego (0.9% Black).

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 Montana overall, where 0.8% of the population is Asian. Eureka ranks 124th statewide in terms of Asian residents as a share of the population, out of 497 places.

Since the 2020 Census, Eureka's Asian population has declined by an estimated 100.0%. Asian residents' share of Eureka's population has decreased from 0.5% to 0.0%.

Eureka's Hispanic Population

53 residents of Eureka, or 2.9% of the population, identify as Hispanic. The share of Hispanic residents in Eureka is comparable to the share in Montana overall, where 4.6% of the population is Hispanic. Eureka ranks 52nd statewide in terms of Hispanic residents as a share of the population, out of 497 places.

Since the 2020 Census, Eureka's Hispanic population has declined by an estimated 36.9%. Hispanic residents' share of Eureka's population has decreased from 6.1% to 2.9%.

Eureka is more Hispanic than neighboring Indian Springs (0% Hispanic), and West Kootenai (0% Hispanic). Eureka is less Hispanic than neighboring Rexford (11.2% Hispanic), Fortine (7.4% Hispanic), and Trego (7.5% Hispanic).

Eureka's Native American/Other Population

29 residents of Eureka, or 1.6% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Eureka is slightly lower than in Montana overall, where 5.9% of the population is Native American/Other. Eureka ranks 281st statewide in terms of Native American/Other residents as a share of the population, out of 497 places.

Since the 2020 Census, Eureka's Native American/Other population has grown by an estimated 61.1%. Native American/Other residents' share of Eureka's population has remained roughly unchanged at 1.6%.

Eureka is more Native American/Other than neighboring Indian Springs (0% Native American/Other), Fortine (0% Native American/Other), and Trego (1% Native American/Other). Eureka is less Native American/Other than neighboring Rexford (8.2% Native American/Other), and West Kootenai (4.5% Native American/Other).

Eureka's Multiracial Population

118 residents of Eureka, or 6.4% of the population, identify as Multiracial. The share of Multiracial residents in Eureka is comparable to the share in Montana overall, where 4.7% of the population is Multiracial. Eureka ranks 174th statewide in terms of Multiracial residents as a share of the population, out of 497 places.

Since the 2020 Census, Eureka's Multiracial population has grown by an estimated 61.6%. Multiracial residents' share of Eureka's population has increased from 5.3% to 6.4%.

Eureka is more Multiracial than neighboring Indian Springs (0% Multiracial), Rexford (0% Multiracial), Fortine (2.6% Multiracial), West Kootenai (0% Multiracial), and Trego (2.2% 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.