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

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

Irvine leans Democratic by roughly 18 points: about 59% of voters vote Democratic and 41% Republican.

 

About 58% of adults in Irvine typically vote, near the U.S. average of about 62%. Among adults in Irvine, ~34% vote Democratic, ~24% Republican, and ~42% don't vote. The map below shows estimated turnout by block group.

How Irvine compares

Among cities within 25 miles, Irvine leans more Democratic than 65 of 75 neighbors.

Politically, Irvine sits close to the rest of California.

Politics vary noticeably by neighborhood within Irvine. The southwest side is the most Democratic-leaning (D+33) and the north side is the least Democratic-leaning (D+11), a spread of about 22 points.

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

Dense areas vote Democratic. About 96% of residents in Irvine live in densely developed areas, about 60 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Irvine sits in the top quarter (about 71%, in the top fraction of cities). A high never-married share predicts Democratic voting, and about 38% of adults in Irvine have never been married, above 92% of cities.

Population density and Democratic lean

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

Why turnout in Irvine looks the way it does

Renters vote less often than owners. About 54% of households in Irvine rent, about 29 points above the U.S. average of 25%. Crowded housing lines up with lower turnout, and about 6% of homes in Irvine have more than one occupant per room, above 90% 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.