Lake Oswego, OR Political Map | Democrat & Republican Areas in Lake Oswego

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

Lake Oswego leans heavily Democratic by roughly 46 points: about 73% of voters vote Democratic and 27% Republican.

 

About 93% of adults in Lake Oswego typically vote, above the U.S. average of about 62%. Among adults in Lake Oswego, ~68% vote Democratic, ~25% Republican, and ~7% don't vote. The map below shows estimated turnout by block group.

How Lake Oswego compares

Among cities within 25 miles, Lake Oswego leans more Democratic than 101 of 103 neighbors.

Lake Oswego runs about 31 points more Democratic than Oregon as a whole.

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

Areas with high college attainment vote Democratic. About 73% of adults in Lake Oswego hold a bachelor's degree, about 45 points above the U.S. average of 28%. Dense areas vote Democratic, and Lake Oswego sits in the top fifth on density (about 90%, above 96% of cities).

Population density and Democratic lean

Places with high population density tend to lean Democratic; Lake Oswego, OR sits in the top tenth nationally on this measure.

Why turnout in Lake Oswego looks the way it does

Areas with strong routine healthcare access turn out at higher rates. Lake Oswego 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 77%, about 17 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 99% of adults in Lake Oswego have completed high school, above 98% of cities. 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.