Rio Dell leans slightly Republican by roughly 10 points: about 45% of voters vote Democratic and 55% Republican.
About 59% of adults in Rio Dell typically vote, near the U.S. average of about 62%. Among adults in Rio Dell, ~27% vote Democratic, ~32% Republican, and ~41% don't vote. The map below shows estimated turnout by block group.
How Rio Dell compares
Among cities within 25 miles, Rio Dell leans more Republican than 22 of 30 neighbors.
Rio Dell runs about 30 points more Republican than California as a whole. California leans Democratic overall, while Rio Dell is one of the few Republican-leaning pockets.
Why Rio Dell 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 Rio Dell, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 87% of residents in Rio Dell drive to work alone, about 14 points above the U.S. average of 74%. Low college attainment predicts Republican voting, and Rio Dell sits in the bottom quarter (about 15%, below 77% of cities). Rio Dell runs against the grain of California, a Republican-leaning pocket in a Democratic-leaning state.
Never-married share, developed land, and voter turnout
Places that combine a never-married-heavy adult population and a heavily developed built environment tend to turn out at a lower rate, as Rio Dell, CA does.
Why turnout in Rio Dell looks the way it does
Renters vote less often than owners. About 45% of households in Rio Dell rent, about 20 points above the U.S. average of 25%. High food insecurity lines up with lower turnout, and about 23% of adults in Rio Dell report food insecurity, above 88% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Scotia, CA R+16
- Hydesville, CA R+21
- Stafford, CA R+17
- Carlotta, CA R+19
- Fortuna, CA D+8
- Shively, CA R+16
- Newburg, CA D+3
- Ferndale, CA D+6
- Fernbridge, CA Even
- Redcrest, CA R+14
Cities with Similar Populations
- Millville, PA R+48
- Center Barnstead, NH R+25
- Robert, LA R+67
- Thomaston, ME R+8
- Winner, SD R+52
- Evarts, KY R+80
- Mineral Point, MO R+61
- Spearman, TX R+68
- Bainbridge, OH R+61
- Rio Verde, AZ R+26
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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.