Yolo County, CA Political Map | Democrat & Republican Areas in Yolo County

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

Yolo County leans heavily Democratic by roughly 34 points: about 67% of voters vote Democratic and 33% Republican.

 

About 57% of adults in Yolo County typically vote, near the U.S. average of about 62%. Among adults in Yolo County, ~38% vote Democratic, ~19% Republican, and ~43% don't vote. The map below shows estimated turnout by block group.

How Yolo County compares

Among counties within 50 miles, Yolo County leans more Democratic than 7 of 8 neighbors.

Yolo County runs about 15 points more Democratic than California as a whole.

Politics vary noticeably by city within Yolo County. The south side runs the most Democratic (D+65) and the northeast side runs the most Republican (R+14), a spread of about 79 points.

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

Dense areas vote Democratic. About 83% of residents in Yolo County live in densely developed areas, about 47 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Yolo County sits in the top quarter (about 47%, above 95% of counties). A high never-married share predicts Democratic voting, and about 43% of adults in Yolo County have never been married, above 96% of counties.

Paved land cover and Democratic lean

Places with extensive paved surfaces tend to lean Democratic; Yolo County, CA sits in the top tenth nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.

Why turnout in Yolo County looks the way it does

Renters vote less often than owners. About 46% of households in Yolo County rent, about 21 points above the U.S. average of 25%. Crowded housing lines up with lower turnout, and about 7% of homes in Yolo County have more than one occupant per room, above 96% of counties. Learn more about the findings and methodology on the political spectrum map.

Sources and methodology

Precinct-level voting records used to fit the model come from California 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.