Grantville leans heavily Democratic by roughly 36 points: about 68% of voters vote Democratic and 32% Republican.
About 54% of adults in Grantville typically vote, below the U.S. average of about 62%. Among adults in Grantville, ~37% vote Democratic, ~17% Republican, and ~46% don't vote. The map below shows estimated turnout by block group.
How Grantville compares
Among neighborhoods within 5 miles, Grantville leans more Democratic than 14 of 26 neighbors.
Grantville runs about 15 points more Democratic than California as a whole.
Politics vary noticeably by block within Grantville. The southwest side is the most Democratic-leaning (D+43) and the southeast side is the least Democratic-leaning (D+26), a spread of about 17 points.
Why Grantville leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Grantville. The lean here lands roughly where demographic data alone would predict.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; Grantville, San Diego, CA sits in the top quarter 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 Grantville looks the way it does
Renters vote less often than owners. About 69% of households in Grantville rent, about 44 points above the U.S. average of 25%. Learn more about the findings and methodology on the political spectrum map.
Nearby Neighborhoods
- Allied Gardens, San Diego, CA D+25
- Kensington, San Diego, CA D+57
- Serra Mesa, San Diego, CA D+30
- Del Cerro, San Diego, CA D+27
- Normal Heights, San Diego, CA D+60
- Talmadge, San Diego, CA D+48
- College Area, San Diego, CA D+41
- East San Diego, San Diego, CA D+45
- Tierrasanta, San Diego, CA D+20
- Mission Valley East, San Diego, CA D+33
Neighborhoods with Similar Populations
- North King St, Hampton, VA D+21
- Pleasant Valley, Vancouver, WA D+7
- Hollywood Hills, Hollywood, FL D+6
- Westside, Grand Rapids, MI D+7
- Rock Creek, Little Rock, AR D+12
- Radnor-Ft Myer Heights, Arlington, VA D+56
- Montclaire South, Charlotte, NC D+52
- Front Park, Buffalo, NY D+47
- Okolona, Louisville, KY D+3
- Town 'N Country Park, Town 'n' Country, FL R+9
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.