Town · Montana
Eureka, Montana
Eureka, town, in Lincoln County, Montana. Eureka had 1,562 residents on July 1, 2025 by the Census Bureau's estimate, up 12.9% since 2020; the 2020 Census counted 1,380 and the ACS 2020-2024 5-year estimates put it at 1,840 (±424). GEOID 3024850.
Residents, July 2025 estimate
1,562
Census Bureau estimate (no margin published)
2020 Census count: 1,380 · ACS 2020-2024: 1,840 ±424
Median household income
$38,750
±$20,418 (90% margin)
Montana: $72,509
Median home value
$172,000
±$23,534 (90% margin)
Montana: $375,800
Median gross rent
$1,038
±$201 (90% margin)
Montana: $1,081
Where is Eureka and what county is it in?
Eureka is a town in Lincoln County, Montana. It covers 1.3 square miles of land, 1,041 residents per square mile in 2020.
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Eureka, and is it growing?
The Census Bureau estimates that 1,562 people lived in Eureka on July 1, 2025, up 12.9% since 2020, faster than Montana (+5.6%). The 2020 Census counted 1,380 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 1,840 (±424).
| Measure | Eureka | Lincoln County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 1,840 ±424 | 21,175 | no clear change |
| Households | 610 ±127 | 9,082 | no clear change |
| Average household size | 2.96 ±0.51 | 2.30 | no clear change |
| Housing units | 664 ±125 | 11,006 | no clear change |
Eureka's population since 2000
From 1,017 in 2000 to 1,562 in 2025: up 53.6%. The 2000, 2010 and 2020 figures are census counts, each for Eureka as it was drawn that year: a place that annexed land, or a community that has since incorporated, covered a different area then. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Eureka?
The median resident of Eureka is 42.4 years old; 29.6% are under 18 and 20.1% are 65 or older. The largest group is non-Hispanic white residents at 89.1%, then non-Hispanic residents of two or more races at 6.4%.
| Measure | Eureka | Lincoln County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 42.4 ±3.4 | 52.8 | −9.3 |
| Under 18 years | 29.6% ±8.9 pts | 18.1% | – |
| 65 years and over | 20.1% ±6.4 pts | 30.1% | – |
| Male | 41.4% ±6.7 pts | 50.6% | – |
| Hispanic or Latino (any race) | 2.9% ±3.9 pts | 3.1% | – |
| White alone, not Hispanic | 89.1% ±5.6 pts | 90.0% | no clear change |
| Black or African American alone, not Hispanic | 0.0% ±1.6 pts | 0.1% | – |
| Asian alone, not Hispanic | 0.0% ±1.6 pts | 0.2% | – |
| American Indian and Alaska Native alone, not Hispanic | 1.6% ±1.5 pts | 1.1% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±1.6 pts | 0.1% | – |
| Two or more races, not Hispanic | 6.4% ±4.3 pts | 5.3% | – |
| Some other race alone, not Hispanic | 0.0% ±1.6 pts | 0.2% | – |
| Born outside the United States | 1.0% ±1.3 pts | 2.6% | – |
| Speak a language other than English at home (age 5+) | 4.2% ±2.9 pts | 5.7% | – |
| Civilian veterans (age 18+) | 11.1% ±6.6 pts | 12.4% | – |
| With a disability | 25.4% ±8.7 pts | 22.9% | – |
| No health insurance coverage | 8.5% ±4.8 pts | 14.9% | no clear change |
| High school graduate or higher (age 25+) | 87.1% ±6.1 pts | 90.5% | – |
| Bachelor's degree or higher (age 25+) | 6.8% ±3.9 pts | 18.9% | no clear change |
| Graduate or professional degree (age 25+) | 1.8% ±2.1 pts | 5.9% | – |
| Lived in the same house a year earlier | 87.8% ±7.7 pts | 89.4% | – |
| Moved from another state in the past year | 0.0% ±1.6 pts | 4.0% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Eureka earn?
Half of Eureka's 610 households earn less than $38,750 a year (±$20,418), against $47,143 in Lincoln County and $72,509 in Montana. In 2015-2019 it was $40,532 in 2024 dollars; the margins of error cannot tell the two periods apart. 31.3% of residents live below the poverty line.
| Measure | Eureka | Lincoln County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $38,750 ±$20,418 | $47,143 | no clear change |
| Mean household income | $59,561 ±$13,008 | $66,699 | – |
| Per capita income | $21,721 ±$4,638 | $29,958 | no clear change |
| People below the poverty line | 31.3% ±13.6 pts | 15.4% | no clear change |
| Children under 18 below the poverty line | 58.7% ±24.4 pts | 26.8% | – |
| Households receiving SNAP | 16.7% ±7.8 pts | 12.2% | – |
| Households with a computer | 89.8% ±7.3 pts | 92.1% | – |
| Households with a broadband subscription | 87.4% ±7.4 pts | 86.6% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Eureka?
Owners occupy 78.5% of Eureka's occupied homes and renters 21.5%. The median owner-occupied home is valued at $172,000 by its owner (±$23,534). The median renter pays $1,038 a month including utilities, and 46.6% of renters pay 35% or more of their income on rent.
| Measure | Eureka | Lincoln County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $172,000 ±$23,534 | $296,500 | no clear change |
| Median gross rent | $1,038 ±$201 | $762 | no clear change |
| Renters paying 35% or more of income on rent | 46.6% ±25.1 pts | 36.9% | no clear change |
| Median monthly owner costs, with a mortgage | $1,534 ±$559 | $1,453 | – |
| Owner-occupied homes | 78.5% ±11.0 pts | 77.6% | no clear change |
| Renter-occupied homes | 21.5% ±11.0 pts | 22.4% | – |
| Housing units | 664 ±125 | 11,006 | no clear change |
| Homeowner vacancy rate | 1.8% ±2.9 pts | 1.3% | – |
| Rental vacancy rate | 0.0% ±20.3 pts | 0.0% | – |
| Single-family detached homes | 62.0% ±9.8 pts | 75.7% | – |
| Mobile homes | 31.6% ±9.6 pts | 15.0% | – |
| Built 2020 or later | 0.0% ±4.4 pts | 1.7% | – |
| Built 2010 to 2019 | 12.5% ±7.6 pts | 10.5% | – |
| Built 1939 or earlier | 18.2% ±7.9 pts | 9.1% | – |
| Households with no vehicle | 2.0% ±3.1 pts | 6.4% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How do people in Eureka work and get to work?
57.7% of Eureka's workers drive alone and 22.3% work from home. The average trip to work takes 13.9 minutes.
| Measure | Eureka | Lincoln County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 58.9% ±10.7 pts | 43.7% | – |
| Unemployment rate | 4.2% ±3.6 pts | 5.1% | – |
| Drove alone to work | 57.7% ±14.3 pts | 59.7% | – |
| Carpooled | 10.3% ±7.1 pts | 16.8% | – |
| Public transportation | 0.0% ±3.9 pts | 0.0% | – |
| Walked | 7.1% ±5.6 pts | 3.7% | – |
| Worked from home | 22.3% ±12.8 pts | 15.5% | – |
| Mean travel time to work | 13.9 min ±4.9 | 18.5 min | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What census tracts are in Eureka?
No census tract lies mostly in Eureka; 2 tracts reach into it (2020 census blocks).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 4.02Lincoln County | 2,989 | $50,136 |
| Tract 4.01Lincoln County | 4,321 | $67,639 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in Eureka) · Census block assignment files
How does Eureka compare with other places in Montana?
By the Census Bureau's July 2025 estimates, Eureka is the 8,594th-most populous of the 19,476 U.S. incorporated places that have one and the 46th-most populous of 127 in Montana.
Eureka ranks 84th of 90 places in Montana with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 46th | 127 |
| Growth 2020-2025 (PEP) | 12th | 53 |
| Residents per square mile | 49th | 93 |
| Median household income | 84th | 90 |
| Per capita income | 86th | 93 |
| Median home value | 78th | 89 |
| Median gross rent | 32nd | 82 |
| Poverty rate | 8th | 65 |
| Bachelor's degree or higher | 90th | 90 |
| Median age | 34th | 93 |
| Owner-occupied share | 22nd | 92 |
| Work from home | 5th | 46 |
| Travel time to work | 70th | 93 |
Eureka's figures with every place in Montana (CSV)
Every place in Montana, sortable · Compare Eureka with other places
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How reliable are the figures for Eureka?
19 of the 57 figures for Eureka on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · ACS technical documentation
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Eureka are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' public schools in Eureka.