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

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

Martinez leans Democratic by roughly 30 points: about 65% of voters vote Democratic and 35% Republican.

 

About 71% of adults in Martinez typically vote, above the U.S. average of about 62%. Among adults in Martinez, ~46% vote Democratic, ~25% Republican, and ~29% don't vote. The map below shows estimated turnout by block group.

How Martinez compares

Among cities within 25 miles, Martinez leans more Democratic than 17 of 73 neighbors.

Martinez runs about 10 points more Democratic than California as a whole.

Politics vary noticeably by neighborhood within Martinez. The northwest side is the most Democratic-leaning (D+41) and the northeast side is the least Democratic-leaning (D+9), a spread of about 32 points.

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

Dense areas vote Democratic. About 86% of residents in Martinez live in densely developed areas, about 50 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Martinez sits in the top quarter (about 43%, above 90% of cities). A high never-married share predicts Democratic voting, and about 31% of adults in Martinez have never been married, above 77% of cities.

Population density and Democratic lean

Places with high population density tend to lean Democratic; Martinez, CA sits in the top tenth nationally on this measure.

Why turnout in Martinez looks the way it does

Areas with strong routine healthcare access turn out at higher rates. Martinez is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 70%, about 10 points above the U.S. average of 60%. 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.