Willowbrook is a Democratic stronghold. About 77% of voters here vote Democratic and 23% Republican.
About 40% of adults in Willowbrook typically vote, below the U.S. average of about 62%. Among adults in Willowbrook, ~31% vote Democratic, ~9% Republican, and ~60% don't vote. The map below shows estimated turnout by block group.
How Willowbrook compares
Among cities within 25 miles, Willowbrook leans more Democratic than 127 of 136 neighbors.
Willowbrook runs about 34 points more Democratic than California as a whole.
Politics vary noticeably by neighborhood within Willowbrook. The southwest side is the most Democratic-leaning (D+69) and the southeast side is the least Democratic-leaning (D+39), a spread of about 30 points.
Why Willowbrook 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 Willowbrook, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in Willowbrook 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 47% of adults in Willowbrook have never been married, above 97% of cities.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; Willowbrook, 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 Willowbrook looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Willowbrook 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 49%, about 13 points below the California average of 62%. Renters vote less often than owners, and about 48% of households in Willowbrook rent, about 23 points above the U.S. average of 25%. High food insecurity lines up with lower turnout, and about 35% of adults in Willowbrook report food insecurity, above 98% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Compton, CA D+53
- Lynwood, CA D+41
- West Athens, CA D+66
- South Gate, CA D+36
- East Rancho Dominguez, CA D+43
- Westmont, CA D+61
- Florence-Graham, CA D+42
- Gardena, CA D+39
- Huntington Park, CA D+37
- Cudahy, CA D+34
Cities with Similar Populations
- La Vergne, TN D+6
- Glen Ellyn, IL D+22
- Madison, TN D+29
- Maricopa, AZ R+9
- Ringgold, GA R+57
- Bettendorf, IA D+5
- Fort Lee, NJ D+16
- Royal Palm Beach, FL D+7
- Pearl City, HI D+17
- Canal Winchester, OH D+17
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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.