South El Monte, CA Political Map | Democrat & Republican Areas in South El Monte

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

South El Monte leans Democratic by roughly 28 points: about 64% of voters vote Democratic and 36% Republican.

 

About 35% of adults in South El Monte typically vote, below the U.S. average of about 62%. Among adults in South El Monte, ~22% vote Democratic, ~13% Republican, and ~65% don't vote. The map below shows estimated turnout by block group.

How South El Monte compares

Among cities within 25 miles, South El Monte leans more Democratic than 89 of 139 neighbors.

South El Monte runs about 8 points more Democratic than California as a whole.

Politics vary noticeably by neighborhood within South El Monte. The east side is the most Democratic-leaning (D+35) and the south side is the least Democratic-leaning (D+22), a spread of about 13 points.

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

Dense areas vote Democratic. More than 99% of residents in South El Monte live in densely developed areas, about 63 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 46% of adults in South El Monte have never been married, above 97% of cities.

Walkability and Democratic lean

Places with a highly walkable street grid tend to lean Democratic; South El Monte, 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 El Monte looks the way it does

Areas with limited routine healthcare access turn out at lower rates. South El Monte 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 58% of households in South El Monte rent, compared to around 42% in nearby cities. High food insecurity lines up with lower turnout, and about 36% of adults in South El Monte report food insecurity, above 98% 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.