Grand Terrace, CA Political Map | Democrat & Republican Areas in Grand Terrace

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

Grand Terrace is a true toss-up. About 48% of voters here vote Democratic and 52% Republican.

 

About 56% of adults in Grand Terrace typically vote, below the U.S. average of about 62%. Among adults in Grand Terrace, ~27% vote Democratic, ~29% Republican, and ~44% don't vote. The map below shows estimated turnout by block group.

How Grand Terrace compares

Among cities within 25 miles, Grand Terrace leans more Republican than 31 of 73 neighbors.

Grand Terrace runs about 25 points more Republican than California as a whole. California leans Democratic overall, while Grand Terrace is one of the few Republican-leaning pockets.

Politics vary noticeably by neighborhood within Grand Terrace. The north side runs the most Democratic (D+5) and the southeast side runs the most Republican (R+18), a spread of about 23 points.

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

Grand Terrace votes against the grain of California. California leans Democratic overall, while Grand Terrace runs about 25 points more Republican.

High-school completion, developed land, and voter turnout

Places that combine low high-school-completion share and a heavily developed built environment tend to turn out at a lower rate, as Grand Terrace, CA does.

Why turnout in Grand Terrace looks the way it does

Areas with limited routine healthcare access turn out at lower rates. Grand Terrace is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Renters vote less often than owners, and about 32% of households in Grand Terrace rent, above 86% of cities. Crowded housing lines up with lower turnout, and about 8% of homes in Grand Terrace have more than one occupant per room, above 95% 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.