Mason County is a true toss-up. About 48% of voters here vote Democratic and 52% Republican.
About 78% of adults in Mason County typically vote, above the U.S. average of about 62%. Among adults in Mason County, ~37% vote Democratic, ~41% Republican, and ~22% don't vote. The map below shows estimated turnout by block group.
How Mason County compares
Among counties within 50 miles, Mason County leans more Republican than 4 of 6 neighbors.
Mason County runs about 23 points more Republican than Washington as a whole. Washington leans Democratic overall, while Mason County is one of the few Republican-leaning pockets.
Politics vary noticeably by city within Mason County. The northwest side runs the most Democratic (D+8) and the southwest side runs the most Republican (R+13), a spread of about 22 points.
Why Mason County leans the way it does
This analysis examined 14,881 data points per county to find what predicts political lean and turnout. The items below are a few correlations that stood out for Mason County, not a ranked or complete list of what matters most.
Mason County votes against the grain of Washington. Washington leans Democratic overall, while Mason County runs about 23 points more Republican.
Homeownership and voter turnout
Places with homeowner-heavy households tend to turn out at a higher rate; Mason County, WA sits in the top quarter nationally on this measure.
Why turnout in Mason County looks the way it does
Homeowners vote more often than renters. About 81% of households in Mason County own their home, about 8 points above the Washington average of 73%. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Thurston County, WA D+19
- Kitsap County, WA D+18
- Pierce County, WA D+12
- Grays Harbor County, WA R+8
- King County, WA D+45
- Lewis County, WA R+29
- Jefferson County, WA D+45
- Clallam County, WA D+9
- Snohomish County, WA D+10
- Island County, WA D+10
Counties with Similar Populations
- Warren County, NY R+2
- Adams County, IL R+40
- Sauk County, WI R+20
- Tehama County, CA R+35
- Armstrong County, PA R+52
- Starr County, TX R+7
- Harrison County, WV R+41
- Wilkes County, NC R+57
- Marquette County, MI Even
- Apache County, AZ D+30
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.