San Fernando, CA Political Map | Democrat & Republican Areas in San Fernando

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

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

 

About 44% of adults in San Fernando typically vote, below the U.S. average of about 62%. Among adults in San Fernando, ~29% vote Democratic, ~15% Republican, and ~56% don't vote. The map below shows estimated turnout by block group.

How San Fernando compares

Among cities within 25 miles, San Fernando leans more Democratic than 57 of 77 neighbors.

San Fernando runs about 13 points more Democratic than California as a whole.

Why San Fernando 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 San Fernando, not a ranked or complete list of what matters most.

Dense areas vote Democratic. More than 99% of residents in San Fernando live in densely developed areas, about 64 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 43% of adults in San Fernando have never been married, above 95% of cities.

Paved land cover and Democratic lean

Places with extensive paved surfaces tend to lean Democratic; San Fernando, 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 San Fernando looks the way it does

Areas with limited routine healthcare access turn out at lower rates. San Fernando is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The uninsured rate here is about 20%, about 10 points above the California average of 10%. Renters vote less often than owners, and about 36% of households in San Fernando rent, above 91% of cities. High food insecurity lines up with lower turnout, and about 28% of adults in San Fernando report food insecurity, above 94% of cities. 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.