Eugene leans heavily Democratic by roughly 40 points: about 70% of voters vote Democratic and 30% Republican.
About 71% of adults in Eugene typically vote, above the U.S. average of about 62%. Among adults in Eugene, ~50% vote Democratic, ~21% Republican, and ~29% don't vote. The map below shows estimated turnout by block group.
How Eugene compares
Among cities within 25 miles, Eugene is the most Democratic-leaning.
Eugene runs about 25 points more Democratic than Oregon as a whole.
Politics vary noticeably by neighborhood within Eugene. The south side is the most Democratic-leaning (D+62) and the west side is the least Democratic-leaning (D+12), a spread of about 50 points.
Why Eugene 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 Eugene, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 87% of residents in Eugene live in densely developed areas, about 50 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Eugene sits in the top quarter (about 43%, above 89% of cities). A high never-married share predicts Democratic voting, and about 41% of adults in Eugene have never been married, above 94% of cities.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; Eugene, OR sits in the top tenth nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in Eugene looks the way it does
Turnout in Eugene 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
- Coburg, OR D+2
- Springfield, OR D+8
- Goshen, OR R+5
- Alvadore, OR R+20
- Riverview, OR R+28
- Junction City, OR R+11
- Creswell, OR R+8
- Veneta, OR R+7
- Pleasant Hill, OR R+15
- Elmira, OR R+23
Cities with Similar Populations
- Port St. Lucie, FL R+7
- Moreno Valley, CA D+18
- Santa Rosa, CA D+42
- Spring Valley, NV D+14
- Brownsville, TX Even
- Murfreesboro, TN R+14
- Shreveport, LA D+29
- Bradenton, FL R+14
- Hialeah, FL R+42
- Frisco, TX R+5
All Local Stats
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Sources and methodology
Precinct-level voting records used to fit the model come from Oregon Secretary of State, Elections Division, 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.