Union County leans heavily Republican by roughly 34 points: about 33% of voters vote Democratic and 67% Republican.
About 74% of adults in Union County typically vote, above the U.S. average of about 62%. Among adults in Union County, ~24% vote Democratic, ~50% Republican, and ~26% don't vote. The map below shows estimated turnout by block group.
How Union County compares
Union County sits in a sparsely populated area with few comparable counties nearby.
Union County runs about 48 points more Republican than Oregon as a whole. Oregon leans Democratic overall, while Union County is one of the few Republican-leaning pockets.
Politics vary noticeably by city within Union County. The south side is the most Republican-leaning (R+59) and the west side is the least Republican-leaning (R+17), a spread of about 42 points.
Why Union County leans the way it does
This analysis examined 14,881 data points per county to find what predicts political lean and turnout. The items below are a few correlations that stood out for Union County, not a ranked or complete list of what matters most.
Union County votes against the grain of Oregon. Oregon leans Democratic overall, while Union County runs about 48 points more Republican.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Union County, OR sits above the national average on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in Union County looks the way it does
Areas with high high-school completion turn out at higher rates. About 94% of adults in Union County have completed high school, above 80% of counties. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Wallowa County, OR R+20
- Baker County, OR R+41
- Walla Walla County, WA R+7
- Umatilla County, OR R+34
- Columbia County, WA R+51
- Grant County, OR R+53
- Garfield County, WA R+58
- Morrow County, OR R+36
- Franklin County, WA R+16
- Asotin County, WA R+29
Counties with Similar Populations
- Grady County, GA R+29
- Wyoming County, PA R+41
- Elbert County, CO R+46
- Charlevoix County, MI R+19
- Taylor County, KY R+50
- Franklin County, KS R+44
- Grayson County, KY R+63
- Sunflower County, MS D+35
- Simpson County, MS R+29
- Dickinson County, MI R+25
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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.