Del Sur, CA Political Map | Democrat & Republican Areas in Del Sur

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

 
Del Sur, CA block-group political-lean map
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About 59% of adults in Del Sur typically vote, near the U.S. average of about 62%. Among adults in Del Sur, ~20% vote Democratic, ~40% Republican, and ~40% don't vote. The map below shows estimated turnout by block group.

Del Sur, CA block-group voter-turnout map
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How Del Sur compares

Among cities within 25 miles, Del Sur leans more Republican than 16 of 19 neighbors.

Del Sur runs about 54 points more Republican than California as a whole. California leans Democratic overall, while Del Sur is one of the few Republican-leaning pockets.

Why Del Sur 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 Del Sur, not a ranked or complete list of what matters most.

Del Sur votes against the grain of California. California leans Democratic overall, while Del Sur runs about 54 points more Republican.

Housing overcrowding and voter turnout

Places with heavy housing overcrowding tend to turn out at a lower rate; Del Sur, CA sits in the top tenth nationally on this measure.

Why turnout in Del Sur looks the way it does

Crowded housing lines up with lower turnout. About 6% of homes in Del Sur have more than one occupant per room, above 91% of cities. Learn more about the findings and methodology on the political spectrum map.

Cities with Similar Populations

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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.