Hillsboro, OR Political Map | Democrat & Republican Areas in Hillsboro

By the BestNeighborhood data science team. Last updated May 2026.

Hillsboro leans heavily Democratic by roughly 30 points: about 65% of voters vote Democratic and 35% Republican.

 

About 67% of adults in Hillsboro typically vote, near the U.S. average of about 62%. Among adults in Hillsboro, ~44% vote Democratic, ~23% Republican, and ~33% don't vote. The map below shows estimated turnout by block group.

How Hillsboro compares

Among cities within 25 miles, Hillsboro leans more Democratic than 72 of 85 neighbors.

Hillsboro runs about 16 points more Democratic than Oregon as a whole.

Politics vary noticeably by neighborhood within Hillsboro. The northeast side is the most Democratic-leaning (D+46) and the southwest side is the least Democratic-leaning (D+16), a spread of about 29 points.

Why Hillsboro 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 Hillsboro, not a ranked or complete list of what matters most.

Dense areas vote Democratic. About 89% of residents in Hillsboro live in densely developed areas, about 53 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Hillsboro sits in the top quarter (about 42%, above 89% of cities). A high never-married share predicts Democratic voting, and about 34% of adults in Hillsboro have never been married, above 86% of cities.

Walkability and Democratic lean

Places with a highly walkable street grid tend to lean Democratic; Hillsboro, 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 Hillsboro looks the way it does

Turnout in Hillsboro sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. Learn more about the findings and methodology on the political spectrum map.

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.