Riverdale leans heavily Republican by roughly 34 points: about 33% of voters vote Democratic and 67% Republican.
About 37% of adults in Riverdale typically vote, below the U.S. average of about 62%. Among adults in Riverdale, ~12% vote Democratic, ~25% Republican, and ~63% don't vote. The map below shows estimated turnout by block group.
How Riverdale compares
Among cities within 25 miles, Riverdale leans more Republican than 24 of 32 neighbors.
Riverdale runs about 55 points more Republican than California as a whole. California leans Democratic overall, while Riverdale is one of the few Republican-leaning pockets.
Politics vary noticeably by neighborhood within Riverdale. The south side is the most Republican-leaning (R+56) and the west side is the least Republican-leaning (R+21), a spread of about 34 points.
Why Riverdale 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 Riverdale, not a ranked or complete list of what matters most.
Areas with low college attainment vote Republican. About 8% of adults in Riverdale hold a bachelor's degree, about 27 points below the California average of 35%. Dense places usually vote Democratic, but Riverdale runs against that pattern. Riverdale runs against the grain of California, a Republican-leaning pocket in a Democratic-leaning state.
High-school completion, developed land, and voter turnout
Places that combine low high-school-completion share and a heavily developed built environment tend to turn out at a lower rate, as Riverdale, CA does.
Why turnout in Riverdale looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Riverdale is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 47%, about 15 points below the California average of 62%. Renters vote less often than owners, and about 50% of households in Riverdale rent, about 25 points above the U.S. average of 25%. High food insecurity lines up with lower turnout, and about 32% of adults in Riverdale report food insecurity, above 96% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Caruthers, CA R+23
- Laton, CA R+37
- Lemoore Naval Air Station, CA R+37
- Elm View, CA R+36
- Burrel, CA R+27
- Hardwick, CA R+53
- Lemoore, CA R+15
- Lemoore Station, CA R+22
- Raisin, CA R+25
- Monmouth, CA R+26
Cities with Similar Populations
- Moore Haven, FL R+38
- New Carlisle, IN R+28
- Olathe, CO R+49
- Oakland, ME R+22
- Adamsville, AL D+31
- Gateway, AK R+30
- Williamson, NY R+25
- Indian Hill, OH R+6
- Lavon, TX R+33
- Holdrege, NE R+50
All Local Stats
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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.