Centennial leans Democratic by roughly 20 points: about 60% of voters vote Democratic and 40% Republican.
About 54% of adults in Centennial typically vote, below the U.S. average of about 62%. Among adults in Centennial, ~32% vote Democratic, ~22% Republican, and ~46% don't vote. The map below shows estimated turnout by block group.
How Centennial compares
Among neighborhoods within 5 miles, Centennial leans more Democratic than 6 of 23 neighbors.
Centennial runs about 5 points more Democratic than Oregon as a whole.
Politics vary noticeably by block within Centennial. The northwest side is the most Democratic-leaning (D+26) and the east side is the least Democratic-leaning (D+12), a spread of about 14 points.
Why Centennial leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Centennial. The lean here lands roughly where demographic data alone would predict.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Centennial, Portland, OR sits in the top quarter nationally on this measure.
Why turnout in Centennial looks the way it does
Areas with low high-school completion turn out at lower rates. About 79% of adults in Centennial have completed high school, about 10 points below the U.S. average of 90%. Learn more about the findings and methodology on the political spectrum map.
Nearby Neighborhoods
- Gresham-Rockwood, Gresham, OR D+24
- Wilkes, Portland, OR D+28
- Mill Park, Portland, OR D+31
- Powellhurst-Gilbert, Portland, OR D+27
- Gresham-Southwest, Gresham, OR D+10
- Gresham-Northwest, Gresham, OR D+24
- Pleasant Valley, Portland, OR D+21
- Hazelwood-Mill Park, Portland, OR D+33
- Gresham-North Gresham, Gresham, OR D+16
- Gresham-North Central, Gresham, OR D+19
Neighborhoods with Similar Populations
- Catholic University-Brookland, Washington, DC D+81
- Highline, Seattle, WA D+37
- Park Heights, Baltimore, MD D+86
- Great Bridge, Chesapeake, VA R+11
- East Broad, Black Lick, OH D+33
- West Valley, Boise, ID Even
- Kyle Canyon, Las Vegas, NV Even
- Belmont, Bronx, NY D+43
- East Boston, Boston, MA D+38
- North End, St. Paul, MN D+45
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.