Sumner leans Republican by roughly 28 points: about 36% of voters vote Democratic and 64% Republican.
About 70% of adults in Sumner typically vote, above the U.S. average of about 62%. Among adults in Sumner, ~25% vote Democratic, ~45% Republican, and ~30% don't vote. The map below shows estimated turnout by block group.
How Sumner compares
Among cities within 25 miles, Sumner leans more Republican than 18 of 30 neighbors.
Sumner runs about 42 points more Republican than Oregon as a whole. Oregon leans Democratic overall, while Sumner is one of the few Republican-leaning pockets.
Politics vary noticeably by neighborhood within Sumner. The west side is the most Republican-leaning (R+32) and the north side is the least Republican-leaning (R+21), a spread of about 11 points.
Why Sumner 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 Sumner, not a ranked or complete list of what matters most.
Sumner votes against the grain of Oregon. Oregon leans Democratic overall, while Sumner runs about 42 points more Republican. A high family-household share predicts Republican voting, and about 76% of households in Sumner are family households, above 79% of cities.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Sumner, OR sits above the national average on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in Sumner looks the way it does
Turnout in Sumner 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
- Allegany, OR R+31
- Eastside, OR R+23
- Libby, OR R+22
- Coaledo, OR R+31
- Coos Bay, OR R+6
- Coquille, OR R+17
- McKinley, OR R+30
- Charleston, OR R+11
- North Bend, OR R+5
- Glasgow, OR D+11
Cities with Similar Populations
- Kinderlou, GA R+25
- Sedley, VA R+40
- Greensboro, FL R+20
- Secretary, MD R+50
- Tekoa, WA R+66
- Wooster, MI R+34
- Ocee, TX R+65
- Olin, IA R+40
- Saltillo, AR R+63
- Livingston, IL R+40
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.