Cornelius leans slightly Democratic by roughly 8 points: about 54% of voters vote Democratic and 46% Republican.
About 54% of adults in Cornelius typically vote, below the U.S. average of about 62%. Among adults in Cornelius, ~29% vote Democratic, ~25% Republican, and ~46% don't vote. The map below shows estimated turnout by block group.
How Cornelius compares
Among cities within 25 miles, Cornelius leans more Democratic than 42 of 72 neighbors.
Cornelius runs about 6 points more Republican than Oregon as a whole.
Politics vary noticeably by neighborhood within Cornelius. The north side runs the most Democratic (D+14) and the southeast side runs the most Republican (R+8), a spread of about 22 points.
Why Cornelius 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 Cornelius, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 49% of residents in Cornelius live in densely developed areas, about 13 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 35% of adults in Cornelius have never been married, above 88% of cities.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Cornelius, OR sits in the top tenth nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in Cornelius looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Cornelius is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Mountaindale, OR R+5
- Forest Grove, OR D+10
- Schefflin, OR R+29
- Hillsboro, OR D+30
- Laurelwood, OR R+8
- Greenville, OR R+35
- Cove Orchard, OR R+20
- Gaston, OR R+14
- North Plains, OR Even
- Glenwood, OR R+25
Cities with Similar Populations
- Blountville, TN R+63
- Melissa, TX R+24
- Swampscott, MA D+31
- Neabsco, VA D+44
- Wilmington Island, GA R+20
- Barrington, IL D+8
- Weston, WI R+10
- Glenview Nas, IL D+26
- Hollidaysburg, PA R+31
- El Campo, TX R+33
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.