Clackamas County leans slightly Democratic by roughly 12 points: about 56% of voters vote Democratic and 44% Republican.
About 82% of adults in Clackamas County typically vote, above the U.S. average of about 62%. Among adults in Clackamas County, ~46% vote Democratic, ~36% Republican, and ~18% don't vote. The map below shows estimated turnout by block group.
How Clackamas County compares
Among counties within 50 miles, Clackamas County leans more Democratic than 6 of 8 neighbors.
Politically, Clackamas County sits close to the rest of Oregon.
Politics vary noticeably by city within Clackamas County. The northwest side runs the most Democratic (D+44) and the southeast side runs the most Republican (R+27), a spread of about 71 points.
Why Clackamas 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 Clackamas County, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 71% of residents in Clackamas County live in densely developed areas, about 35 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Clackamas County sits in the top quarter (about 41%, above 92% of counties).
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Clackamas County, 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 Clackamas County looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Clackamas County is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 69%, about 9 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 95% of adults in Clackamas County have completed high school, above 89% of counties. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Multnomah County, OR D+52
- Washington County, OR D+32
- Clark County, WA D+7
- Yamhill County, OR R+5
- Marion County, OR D+3
- Skamania County, WA R+13
- Columbia County, OR R+18
- Polk County, OR R+4
- Hood River County, OR D+24
- Cowlitz County, WA R+18
Counties with Similar Populations
- Cameron County, TX R+2
- Loudoun County, VA D+18
- Hillsborough County, NH D+11
- Pinal County, AZ R+16
- Richland County, SC D+38
- Mobile County, AL R+8
- Berks County, PA R+8
- Lucas County, OH D+17
- Sarasota County, FL R+17
- Charleston County, SC D+14
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.