Iron Triangle, Richmond, CA Political Map | Democrat & Republican Areas in Iron Triangle

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

Iron Triangle is a Democratic stronghold. About 77% of voters here vote Democratic and 23% Republican.

 

About 30% of adults in Iron Triangle typically vote, below the U.S. average of about 62%. Among adults in Iron Triangle, ~23% vote Democratic, ~7% Republican, and ~70% don't vote. The map below shows estimated turnout by block group.

How Iron Triangle compares

Among neighborhoods within 5 miles, Iron Triangle leans more Democratic than 2 of 11 neighbors.

Iron Triangle runs about 34 points more Democratic than California as a whole.

Politics vary noticeably by block within Iron Triangle. The east side is the most Democratic-leaning (D+61) and the northeast side is the least Democratic-leaning (D+49), a spread of about 12 points.

Why Iron Triangle leans the way it does

This analysis examined 14,881 data points per neighborhood to find what predicts political lean and turnout. The items below are a few correlations that stood out for Iron Triangle, not a ranked or complete list of what matters most.

Dense areas vote Democratic. More than 99% of residents in Iron Triangle 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 50% of adults in Iron Triangle have never been married, above 82% of neighborhoods.

Paved land cover and Democratic lean

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

Areas with limited routine healthcare access turn out at lower rates. Iron Triangle 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 48%, about 14 points below the California average of 62%. High food insecurity lines up with lower turnout, and about 35% of adults in Iron Triangle report food insecurity, above 88% of neighborhoods. Low high-school completion lines up with lower turnout, and about 61% of adults in Iron Triangle have completed high school, below 98% 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.