Arrowhead, San Bernardino, CA Political Map | Democrat & Republican Areas in Arrowhead

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

Arrowhead leans slightly Democratic by roughly 10 points: about 55% of voters vote Democratic and 45% Republican.

 

About 42% of adults in Arrowhead typically vote, below the U.S. average of about 62%. Among adults in Arrowhead, ~23% vote Democratic, ~19% Republican, and ~58% don't vote. The map below shows estimated turnout by block group.

How Arrowhead compares

Among neighborhoods within 5 miles, Arrowhead leans more Democratic than 5 of 37 neighbors.

Arrowhead runs about 10 points more Republican than California as a whole.

Why Arrowhead leans the way it does

Density, race composition, education, and family structure all sit close to their national averages in Arrowhead. The lean here lands roughly where demographic data alone would predict.

Population density and Democratic lean

Places with high population density tend to lean Democratic; Arrowhead, San Bernardino, CA sits in the top quarter nationally on this measure.

Why turnout in Arrowhead looks the way it does

Areas with limited routine healthcare access turn out at lower rates. Arrowhead is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Crowded housing lines up with lower turnout, and about 8% of homes in Arrowhead have more than one occupant per room, above 88% of neighborhoods. Learn more about the findings and methodology on the political spectrum map.

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.