Fullerton, CA Political Map | Democrat & Republican Areas in Fullerton

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

Fullerton leans slightly Democratic by roughly 12 points: about 56% of voters vote Democratic and 44% Republican.

 

About 58% of adults in Fullerton typically vote, near the U.S. average of about 62%. Among adults in Fullerton, ~32% vote Democratic, ~26% Republican, and ~42% don't vote. The map below shows estimated turnout by block group.

How Fullerton compares

Among cities within 25 miles, Fullerton leans more Democratic than 51 of 136 neighbors.

Fullerton runs about 9 points more Republican than California as a whole.

Politics vary noticeably by neighborhood within Fullerton. The east side runs the most Democratic (D+21) and the north side runs the most Republican (R+3), a spread of about 24 points.

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

Dense areas vote Democratic. About 99% of residents in Fullerton live in densely developed areas, about 63 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Fullerton sits in the top quarter (about 43%, above 89% of cities). A high never-married share predicts Democratic voting, and about 38% of adults in Fullerton have never been married, above 92% of cities.

Paved land cover and Democratic lean

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

Renters vote less often than owners. About 48% of households in Fullerton rent, about 23 points above the U.S. average of 25%. Crowded housing lines up with lower turnout, and about 11% of homes in Fullerton have more than one occupant per room, above 97% 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.