South Pasadena, CA Political Map | Democrat & Republican Areas in South Pasadena

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

South Pasadena is a Democratic stronghold. About 76% of voters here vote Democratic and 24% Republican.

 

About 69% of adults in South Pasadena typically vote, above the U.S. average of about 62%. Among adults in South Pasadena, ~52% vote Democratic, ~16% Republican, and ~32% don't vote. The map below shows estimated turnout by block group.

How South Pasadena compares

Among cities within 25 miles, South Pasadena leans more Democratic than 126 of 137 neighbors.

South Pasadena runs about 31 points more Democratic than California as a whole.

Politics vary noticeably by neighborhood within South Pasadena. The northeast side is the most Democratic-leaning (D+58) and the southwest side is the least Democratic-leaning (D+44), a spread of about 13 points.

Why South Pasadena 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 South Pasadena, not a ranked or complete list of what matters most.

Dense areas vote Democratic. More than 99% of residents in South Pasadena live in densely developed areas, about 63 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and South Pasadena sits in the top quarter (about 73%, in the top fraction of cities). A high never-married share predicts Democratic voting, and about 34% of adults in South Pasadena have never been married, above 86% of cities.

Walkability and Democratic lean

Places with a highly walkable street grid tend to lean Democratic; South Pasadena, CA sits in the top tenth nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.

Why turnout in South Pasadena looks the way it does

Areas with strong routine healthcare access turn out at higher rates. South Pasadena is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 74%, about 14 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 97% of adults in South Pasadena have completed high school, above 91% 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.