Eureka is a Republican stronghold. About 23% of voters here vote Democratic and 77% Republican.
About 66% of adults in Eureka typically vote, near the U.S. average of about 62%. Among adults in Eureka, ~15% vote Democratic, ~51% Republican, and ~34% 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 40 of 81 neighbors.
Eureka runs about 34 points more Republican than Indiana as a whole.
Why Eureka leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Eureka. The lean here lands roughly where demographic data alone would predict.
High-school completion and voter turnout
Places with high-school-completion-heavy adults tend to turn out at a higher rate; Eureka, IN sits in the top tenth nationally on this measure.
Why turnout in Eureka looks the way it does
Areas with high high-school completion turn out at higher rates. More than 99% of adults in Eureka have completed high school, about 9 points above the Indiana average of 90%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Hatfield, IN R+52
- Richland, IN R+52
- Reo, IN R+51
- Patronville, IN R+53
- Bullocktown, IN R+51
- Newman, KY R+51
- Red Bush, IN R+46
- Rockport, IN R+51
- Yankeetown, IN R+46
- Sorgho, KY R+50
Cities with Similar Populations
- Reynolds, ID R+74
- Farmington, WA R+52
- Semiway, KY R+61
- Burnett, MN R+18
- Fleming, MO R+60
- Morse, WI R+24
- Linnsburg, IN R+61
- Wirock, MN R+55
- Newman, KY R+51
- Garfield, ID R+65
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Sources and methodology
Precinct-level voting records used to fit the model come from Indiana 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.