Corvallis, OR Political Map | Democrat & Republican Areas in Corvallis

By the BestNeighborhood data science team. Last updated May 2026.

Corvallis is a Democratic stronghold. About 77% of voters here vote Democratic and 23% Republican.

 

About 69% of adults in Corvallis typically vote, above the U.S. average of about 62%. Among adults in Corvallis, ~53% vote Democratic, ~16% Republican, and ~31% don't vote. The map below shows estimated turnout by block group.

How Corvallis compares

Among cities within 25 miles, Corvallis is the most Democratic-leaning.

Corvallis runs about 40 points more Democratic than Oregon as a whole.

Politics vary noticeably by neighborhood within Corvallis. The west side is the most Democratic-leaning (D+69) and the northeast side is the least Democratic-leaning (D+37), a spread of about 31 points.

Why Corvallis 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 Corvallis, not a ranked or complete list of what matters most.

Dense areas vote Democratic. About 73% of residents in Corvallis live in densely developed areas, about 37 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Corvallis sits in the top quarter (about 59%, above 96% of cities). A high never-married share predicts Democratic voting, and about 50% of adults in Corvallis have never been married, above 98% of cities.

Paved land cover and Democratic lean

Places with extensive paved surfaces tend to lean Democratic; Corvallis, 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 Corvallis looks the way it does

Areas with high high-school completion turn out at higher rates. About 96% of adults in Corvallis have completed high school, about 7 points above the U.S. average of 90%. Learn more about the findings and methodology on the political spectrum map.

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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.