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

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

Riverside County is a true toss-up. About 51% of voters here vote Democratic and 49% Republican.

 

About 54% of adults in Riverside County typically vote, below the U.S. average of about 62%. Among adults in Riverside County, ~28% vote Democratic, ~26% Republican, and ~46% don't vote. The map below shows estimated turnout by block group.

How Riverside County compares

Among counties within 50 miles, Riverside County sits roughly in the middle of the political spectrum, with 0 neighbors leaning further in the place's direction and 2 leaning the other way.

Riverside County runs about 19 points more Republican than California as a whole.

Politics vary noticeably by city within Riverside County. The east side runs the most Democratic (D+15) and the southwest side runs the most Republican (R+16), a spread of about 30 points.

Why Riverside County leans the way it does

Density, race composition, education, and family structure all sit close to their national averages in Riverside County. The lean here lands roughly where demographic data alone would predict.

Population density and Democratic lean

Places with high population density tend to lean Democratic; Riverside County, CA sits in the top tenth nationally on this measure.

Why turnout in Riverside County looks the way it does

Areas with limited routine healthcare access turn out at lower rates. Riverside County is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. High food insecurity lines up with lower turnout, and about 22% of adults in Riverside County report food insecurity, above 82% of counties. Learn more about the findings and methodology on the political spectrum map.

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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.