Plymouth leans heavily Republican by roughly 46 points: about 27% of voters vote Democratic and 73% Republican.
About 30% of adults in Plymouth typically vote, below the U.S. average of about 62%. Among adults in Plymouth, ~8% vote Democratic, ~22% Republican, and ~70% don't vote. The map below shows estimated turnout by block group.
How Plymouth compares
Among cities within 25 miles, Plymouth leans more Republican than 11 of 17 neighbors.
Plymouth runs about 64 points more Republican than Washington as a whole. Washington leans Democratic overall, while Plymouth is one of the few Republican-leaning pockets.
Why Plymouth 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 Plymouth, not a ranked or complete list of what matters most.
Rural areas vote Republican. About 4% of residents in Plymouth live in densely developed areas, about 37 points below the Washington average of 41%. Plymouth runs against the grain of Washington, a Republican-leaning pocket in a Democratic-leaning state.
Population density and Republican lean
Places with low population density tend to lean Republican; Plymouth, WA sits in the bottom tenth nationally on this measure.
Why turnout in Plymouth looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Plymouth is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. High-crime urban areas turn out at lower rates, and Plymouth sits in the top 15% on a violent-crime measure. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Umatilla, OR R+38
- Irrigon, OR R+41
- Hermiston, OR R+28
- Stanfield, OR R+53
- Paterson, WA R+40
- Echo, OR R+64
- Boardman, OR R+20
- Wallula Junction, WA R+50
- Kennewick, WA R+21
- Finley, WA R+41
Cities with Similar Populations
- Stafford, OK R+71
- Selden, KS R+83
- Hissop, AL R+40
- Mazeppa, PA R+56
- Moscow, MS Even
- Bohannon, VA R+30
- St. Anthony, ND R+73
- Biehle, MO R+72
- Roxbury, PA R+71
- Springerton, IL R+68
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.