Washington County is a Republican stronghold. About 18% of voters here vote Democratic and 82% Republican.
About 70% of adults in Washington County typically vote, above the U.S. average of about 62%. Among adults in Washington County, ~13% vote Democratic, ~57% Republican, and ~30% don't vote. The map below shows estimated turnout by block group.
How Washington County compares
Among counties within 50 miles, Washington County leans more Republican than 8 of 10 neighbors.
Washington County runs about 45 points more Republican than Missouri as a whole.
Why Washington 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 Washington County, not a ranked or complete list of what matters most.
Areas with low college attainment vote Republican. About 12% of adults in Washington County hold a bachelor's degree, about 10 points below the Missouri average of 22%. Rural areas vote Republican, and Washington County sits in the bottom quarter on density (about 10%, below 82% of counties).
Walkability and Republican lean
Places with a low walkability score tend to lean Republican; Washington County, MO sits in the bottom quarter 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 Washington County looks the way it does
Turnout in Washington County sits close to the national pattern. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- St. Francois County, MO R+48
- Iron County, MO R+60
- Crawford County, MO R+61
- Jefferson County, MO R+39
- Ste. Genevieve County, MO R+55
- Franklin County, MO R+48
- Madison County, MO R+63
- Monroe County, IL R+39
- Reynolds County, MO R+67
- Dent County, MO R+65
Counties with Similar Populations
- Plaquemines Parish, LA R+27
- Juniata County, PA R+62
- Menominee County, MI R+30
- Grainger County, TN R+71
- Winston County, AL R+82
- Seminole County, OK R+51
- Mingo County, WV R+71
- Roscommon County, MI R+26
- Curry County, OR R+11
- Antrim County, MI R+21
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Sources and methodology
Precinct-level voting records used to fit the model come from Missouri 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.