Alviso leans Democratic by roughly 24 points: about 62% of voters vote Democratic and 38% Republican.
About 32% of adults in Alviso typically vote, below the U.S. average of about 62%. Among adults in Alviso, ~20% vote Democratic, ~12% Republican, and ~68% don't vote. The map below shows estimated turnout by block group.
How Alviso compares
Among cities within 25 miles, Alviso leans more Democratic than 5 of 58 neighbors.
Alviso runs about 4 points more Democratic than California as a whole.
Why Alviso 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 Alviso, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 38% of adults in Alviso hold a bachelor's degree, about 9 points above the U.S. average of 28%. Density combined with diversity predicts Democratic voting, and non-Hispanic white share in Alviso is about 18%, about 54 points below the U.S. average of 72%. A high never-married share predicts Democratic voting, and about 41% of adults in Alviso have never been married, above 94% of cities.
Cancer-screening access and voter turnout
Places with low colon-cancer-screening access tend to turn out at a lower rate; Alviso, CA sits in the bottom tenth nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in Alviso looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Alviso is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. High food insecurity lines up with lower turnout, and about 21% of adults in Alviso report food insecurity, above 83% of cities. Low high-school completion lines up with lower turnout, and about 78% of adults in Alviso have completed high school, below 93% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Milpitas, CA D+25
- Sunnyvale, CA D+36
- Santa Clara, CA D+35
- Mountain View, CA D+46
- Los Altos, CA D+40
- Fremont, CA D+34
- Newark, CA D+35
- Cupertino, CA D+31
- Alum Rock, CA D+29
- Palo Alto, CA D+52
Cities with Similar Populations
- Oriental, NC R+27
- Nanjemoy, MD R+20
- Pinewood, SC R+7
- Reedville, VA R+30
- North Jackson, OH R+43
- Edwards AFB, CA R+12
- Tunica Resorts, MS D+37
- Alpine, WY R+53
- Central City, PA R+57
- Ontonagon, MI R+27
All Local Stats
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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.