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

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

Tidewater leans Democratic by roughly 20 points: about 60% of voters vote Democratic and 40% Republican.

 

About 87% of adults in Tidewater typically vote, above the U.S. average of about 62%. Among adults in Tidewater, ~52% vote Democratic, ~35% Republican, and ~13% don't vote. The map below shows estimated turnout by block group.

How Tidewater compares

Among cities within 25 miles, Tidewater leans more Democratic than 26 of 32 neighbors.

Tidewater runs about 5 points more Democratic than Oregon as a whole.

Politics vary noticeably by neighborhood within Tidewater. The north side runs the most Democratic (D+52) and the southeast side runs the most Republican (R+17), a spread of about 69 points.

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

Areas with high college attainment vote Democratic. About 42% of adults in Tidewater hold a bachelor's degree, about 14 points above the U.S. average of 28%.

Park access and Democratic lean

Places with heavy park coverage tend to lean Democratic; Tidewater, OR sits in the top tenth nationally on this measure. Park access does not change how people vote; it tends to track denser, higher-income areas.

Why turnout in Tidewater looks the way it does

Areas with strong routine healthcare access turn out at higher rates. Tidewater 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 69%, about 9 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 97% of adults in Tidewater have completed high school, above 91% of cities. Learn more about the findings and methodology on the political spectrum map.

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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.