Mill Park leans heavily Democratic by roughly 30 points: about 65% of voters vote Democratic and 35% Republican.
About 55% of adults in Mill Park typically vote, below the U.S. average of about 62%. Among adults in Mill Park, ~36% vote Democratic, ~19% Republican, and ~45% don't vote. The map below shows estimated turnout by block group.
How Mill Park compares
Among neighborhoods within 5 miles, Mill Park leans more Democratic than 11 of 29 neighbors.
Mill Park runs about 17 points more Democratic than Oregon as a whole.
Politics vary noticeably by block within Mill Park. The north side is the most Democratic-leaning (D+38) and the southwest side is the least Democratic-leaning (D+16), a spread of about 22 points.
Why Mill Park leans the way it does
This analysis examined 14,881 data points per neighborhood to find what predicts political lean and turnout. The items below are a few correlations that stood out for Mill Park, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in Mill Park live in densely developed areas, about 64 points above the U.S. average of 36%.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Mill Park, Portland, 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 Mill Park looks the way it does
Areas with low high-school completion turn out at lower rates. About 85% of adults in Mill Park have completed high school, below 77% of neighborhoods. Learn more about the findings and methodology on the political spectrum map.
Nearby Neighborhoods
- Hazelwood-Mill Park, Portland, OR D+33
- Powellhurst-Gilbert, Portland, OR D+27
- Montavilla, Portland, OR D+65
- Centennial, Portland, OR D+19
- Wilkes, Portland, OR D+28
- Parkrose, Portland, OR D+35
- Argay, Portland, OR D+30
- Lents, Portland, OR D+33
- Madison South, Portland, OR D+65
- Pleasant Valley, Portland, OR D+21
Neighborhoods with Similar Populations
- Kamuela, Waimea, HI D+24
- Mount Airy, Cincinnati, OH D+58
- Ivey Ranch-Rancho del Oro, Oceanside, CA D+13
- Lower Highlands, Fall River, MA D+10
- Issaquah Highlands, Issaquah, WA D+45
- Corlett, Cleveland, OH D+89
- Govans, Baltimore, MD D+85
- Water Catchment Area, West Palm Beach, FL D+14
- Security, Security-Widefield, CO R+11
- Longwood-Winton Grove, Hayward, CA D+37
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.