Sunnyvale West leans heavily Democratic by roughly 38 points: about 69% of voters vote Democratic and 31% Republican.
About 58% of adults in Sunnyvale West typically vote, near the U.S. average of about 62%. Among adults in Sunnyvale West, ~40% vote Democratic, ~18% Republican, and ~42% don't vote. The map below shows estimated turnout by block group.
How Sunnyvale West compares
Among neighborhoods within 5 miles, Sunnyvale West leans more Democratic than 7 of 19 neighbors.
Sunnyvale West runs about 17 points more Democratic than California as a whole.
Why Sunnyvale West leans the way it does
This analysis examined 14,881 data points per neighborhood to find what predicts political lean and turnout. The items below are a few correlations that stood out for Sunnyvale West, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 78% of adults in Sunnyvale West hold a bachelor's degree, about 49 points above the U.S. average of 28%. Dense areas vote Democratic, and Sunnyvale West sits in the top fifth on density (more than 99%, above 89% of neighborhoods).
Population density and Democratic lean
Places with high population density tend to lean Democratic; Sunnyvale West, Sunnyvale, CA sits in the top tenth nationally on this measure.
Why turnout in Sunnyvale West looks the way it does
Crowded housing lines up with lower turnout. About 7% of homes in Sunnyvale West have more than one occupant per room, above 85% of neighborhoods. Strong routine healthcare access lines up with higher turnout, and Sunnyvale West sits in the top quarter on routine-care measures. Learn more about the findings and methodology on the political spectrum map.
Nearby Neighborhoods
- Heritage District, Sunnyvale, CA D+43
- South Los Altos, Los Altos, CA D+38
- Martens-Carmelita, Mountain View, CA D+38
- Lowlanders, Sunnyvale, CA D+42
- Ponderosa Park, Sunnyvale, CA D+34
- Whisman Station, Mountain View, CA D+45
- Birdland Neighbors, Sunnyvale, CA D+36
- Cuesta Park, Mountain View, CA D+40
- Snail, Sunnyvale, CA D+33
- Old Mountain View, Mountain View, CA D+60
Neighborhoods with Similar Populations
- Makakilo-Kapolei-Honokai Hale, Kapolei, HI D+8
- Allapattah, Miami, FL R+6
- Greenwich Village, Manhattan, NY D+71
- Encanto, Phoenix, AZ D+38
- Outer Sunset, San Francisco, CA D+49
- Arleta, Pacoima, CA D+31
- Almaden Valley, San Jose, CA D+27
- West Los Angeles, Los Angeles, CA D+40
- South Ozone Park, Queens, NY D+31
- Mission Bay, San Diego, CA D+21
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.