Umatilla leans heavily Republican by roughly 38 points: about 31% of voters vote Democratic and 69% Republican.
About 52% of adults in Umatilla typically vote, below the U.S. average of about 62%. Among adults in Umatilla, ~16% vote Democratic, ~36% Republican, and ~48% don't vote. The map below shows estimated turnout by block group.
How Umatilla compares
Among cities within 25 miles, Umatilla leans more Republican than 5 of 15 neighbors.
Umatilla runs about 53 points more Republican than Oregon as a whole. Oregon leans Democratic overall, while Umatilla is one of the few Republican-leaning pockets.
Politics vary noticeably by neighborhood within Umatilla. The southwest side is the most Republican-leaning (R+49) and the north side is the least Republican-leaning (R+21), a spread of about 28 points.
Why Umatilla 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 Umatilla, not a ranked or complete list of what matters most.
Umatilla votes against the grain of Oregon. Oregon leans Democratic overall, while Umatilla runs about 53 points more Republican. Dense places usually vote Democratic, but Umatilla runs against that pattern. Low college attainment predicts Republican voting, and Umatilla sits in the bottom quarter (about 13%, below 84% of cities).
High-school completion, developed land, and voter turnout
Places that combine low high-school-completion share and a heavily developed built environment tend to turn out at a lower rate, as Umatilla, OR does.
Why turnout in Umatilla looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Umatilla is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Low high-school completion lines up with lower turnout, and about 82% of adults in Umatilla have completed high school, below 88% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Plymouth, WA R+46
- Hermiston, OR R+28
- Irrigon, OR R+41
- Stanfield, OR R+53
- Echo, OR R+64
- Wallula Junction, WA R+50
- Paterson, WA R+40
- Boardman, OR R+20
- Kennewick, WA R+21
- Finley, WA R+41
Cities with Similar Populations
- Vinita, OK R+44
- Wenonah, NJ D+2
- Rawlins, WY R+52
- Whiteland, IN R+42
- Odessa, MO R+50
- Beech Island, SC R+15
- Palm Beach, FL R+17
- Fruitvale, CO R+30
- Denton, MD R+26
- Crestwood Village, NJ R+18
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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.