Eureka leans heavily Republican by roughly 50 points: about 25% of voters vote Democratic and 75% Republican.
About 81% of adults in Eureka typically vote, above the U.S. average of about 62%. Among adults in Eureka, ~20% vote Democratic, ~61% Republican, and ~19% don't vote. The map below shows estimated turnout by block group.
How Eureka compares
Among cities within 25 miles, Eureka leans more Republican than 1 of 5 neighbors.
Eureka runs about 29 points more Republican than Montana as a whole.
Politics vary noticeably by neighborhood within Eureka. The southwest side is the most Republican-leaning (R+58) and the west side is the least Republican-leaning (R+44), a spread of about 13 points.
Why Eureka leans the way it does
This analysis examined 14,881 data points per city to find what predicts political lean and turnout. The items below are a few correlations that stood out for Eureka, not a ranked or complete list of what matters most.
Eureka votes Republican even though it is densely developed (about 27%, modestly above the Montana average of 13%). Here an older population outweighs the Democratic lean that density usually predicts.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Eureka, MT sits in the top quarter nationally on this measure.
Why turnout in Eureka looks the way it does
Turnout in Eureka sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Rexford, MT R+57
- Roosville, MT R+56
- Fortine, MT R+57
- Trego, MT R+57
- Stryker, MT R+43
- Yaak, MT R+52
- Polebridge, MT R+16
- Olney, MT R+29
- Libby, MT R+47
- Whitefish, MT R+6
Cities with Similar Populations
- Kenbridge, VA R+18
- Midway, KY R+25
- Crockett, CA D+40
- Pine Mountain, GA R+38
- Ellaville, GA R+59
- Lac Du Flambeau, WI D+28
- Hennessey, OK R+64
- Fletcher, OK R+55
- Dunkirk, IN R+52
- Valentine, NE R+56
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Sources and methodology
Precinct-level voting records used to fit the model come from Montana Secretary of State, Elections, distributed by the Voting and Election Science Team. Demographic inputs come from the U.S. Census Bureau (ACS 5-year estimates and the 2020 Decennial Census). Health and environmental inputs come from the CDC (PLACES and the Environmental Justice Index). Land cover comes from the USGS and EPA. Election-day and lead-up weather come from PRISM 4km daily grids and the NOAA Global Historical Climatology Network. Mail-voting and election-administration patterns come from the MIT Election Lab's Survey of the Performance of American Elections. Block-group crime detail comes from CrimeGrade. Internet data and modeling support provided by ISPreports.org.
Modeling and analysis by the BestNeighborhood data science team. Full methodology and findings: political spectrum map.
Methodology reviewed by the BestNeighborhood data team. Last updated May 2026.