Cupertino leans heavily Democratic by roughly 32 points: about 66% of voters vote Democratic and 34% Republican.
About 59% of adults in Cupertino typically vote, near the U.S. average of about 62%. Among adults in Cupertino, ~39% vote Democratic, ~20% Republican, and ~41% don't vote. The map below shows estimated turnout by block group.
How Cupertino compares
Among cities within 25 miles, Cupertino leans more Democratic than 10 of 59 neighbors.
Cupertino runs about 11 points more Democratic than California as a whole.
Why Cupertino 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 Cupertino, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 82% of adults in Cupertino hold a bachelor's degree, about 53 points above the U.S. average of 28%. Dense areas vote Democratic, and Cupertino sits in the top fifth on density (about 93%, above 97% of cities).
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; Cupertino, 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 Cupertino looks the way it does
Renters vote less often than owners. About 40% of households in Cupertino rent, about 15 points above the U.S. average of 25%. Strong routine healthcare access lines up with higher turnout, and Cupertino sits in the top quarter on routine-care measures. Crowded housing lines up with lower turnout, and about 6% of homes in Cupertino have more than one occupant per room, above 90% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Saratoga, CA D+29
- Sunnyvale, CA D+36
- Santa Clara, CA D+35
- Los Altos, CA D+40
- Campbell, CA D+31
- Mountain View, CA D+46
- Monte Sereno, CA D+34
- Los Altos Hills, CA D+23
- Los Gatos, CA D+32
- Alviso, CA D+24
Cities with Similar Populations
- Pottstown, PA D+7
- Towson, MD D+43
- Skokie, IL D+27
- Goldsboro, NC D+8
- Dearborn Heights, MI R+6
- San Clemente, CA R+11
- Orland Park, IL R+9
- Manhattan, KS D+9
- Decatur, AL R+18
- Tamiami, FL R+43
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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.