Happy Valley leans Democratic by roughly 20 points: about 60% of voters vote Democratic and 40% Republican.
About 75% of adults in Happy Valley typically vote, above the U.S. average of about 62%. Among adults in Happy Valley, ~45% vote Democratic, ~30% Republican, and ~25% don't vote. The map below shows estimated turnout by block group.
How Happy Valley compares
Among cities within 25 miles, Happy Valley leans more Democratic than 62 of 85 neighbors.
Happy Valley runs about 6 points more Democratic than Oregon as a whole.
Politics vary noticeably by neighborhood within Happy Valley. The southwest side is the most Democratic-leaning (D+32) and the northeast side is the least Democratic-leaning (D+12), a spread of about 20 points.
Why Happy Valley 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 Happy Valley, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 90% of residents in Happy Valley live in densely developed areas, about 53 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Happy Valley sits in the top quarter (about 43%, above 89% of cities). A high never-married share predicts Democratic voting, and about 32% of adults in Happy Valley have never been married, above 79% of cities.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Happy Valley, OR sits in the top tenth nationally on this measure.
Why turnout in Happy Valley looks the way it does
Areas with high high-school completion turn out at higher rates. About 96% of adults in Happy Valley have completed high school, about 6 points above the U.S. average of 90%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Clackamas, OR D+18
- Johnson City, OR D+8
- Oatfield, OR D+24
- Damascus, OR R+6
- Milwaukie, OR D+39
- Gladstone, OR D+17
- Oak Grove, OR D+37
- Gresham, OR D+15
- Marylhurst, OR D+34
- Portland, OR D+25
Cities with Similar Populations
- Englewood, FL R+30
- Auburn, CA R+12
- Langhorne, PA D+4
- Quakertown, PA R+15
- Oconomowoc, WI R+22
- Belvidere, IL R+9
- Black Lick, OH D+23
- Anniston, AL R+9
- Oakton, VA D+37
- Coram, NY Even
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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.