Newcastle leans heavily Democratic by roughly 42 points: about 71% of voters vote Democratic and 29% Republican.
About 78% of adults in Newcastle typically vote, above the U.S. average of about 62%. Among adults in Newcastle, ~55% vote Democratic, ~23% Republican, and ~22% don't vote. The map below shows estimated turnout by block group.
How Newcastle compares
Among cities within 25 miles, Newcastle leans more Democratic than 87 of 100 neighbors.
Newcastle runs about 24 points more Democratic than Washington as a whole.
Why Newcastle 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 Newcastle, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 72% of residents in Newcastle live in densely developed areas, about 35 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Newcastle sits in the top quarter (about 69%, above 98% of cities).
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Newcastle, WA 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 Newcastle looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Newcastle 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 75%, about 15 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 97% of adults in Newcastle have completed high school, above 93% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Mercer Island, WA D+50
- East Renton Highlands, WA D+23
- Renton, WA D+33
- Beaux Arts Village, WA D+48
- Bryn Mawr-Skyway, WA D+48
- Bellevue, WA D+44
- Fairwood, WA D+31
- Issaquah, WA D+42
- Tukwila, WA D+38
- Boulevard Park, WA D+34
Cities with Similar Populations
- Kingston, MA D+4
- Berwyn, PA D+26
- Edgewood, WA Even
- Nanticoke, PA R+17
- Longs, SC R+27
- New Providence, NJ D+19
- Coopersburg, PA R+13
- Suffern, NY D+5
- Weigelstown, PA R+25
- Kewanee, IL R+14
Sources and methodology
Precinct-level voting records used to fit the model come from Washington Secretary of State, Elections, 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.