Campbell leans heavily Democratic by roughly 32 points: about 66% of voters vote Democratic and 34% Republican.
About 65% of adults in Campbell typically vote, near the U.S. average of about 62%. Among adults in Campbell, ~43% vote Democratic, ~22% Republican, and ~35% don't vote. The map below shows estimated turnout by block group.
How Campbell compares
Among cities within 25 miles, Campbell leans more Democratic than 15 of 56 neighbors.
Campbell runs about 11 points more Democratic than California as a whole.
Politics vary noticeably by neighborhood within Campbell. The east side is the most Democratic-leaning (D+37) and the southwest side is the least Democratic-leaning (D+25), a spread of about 12 points.
Why Campbell 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 Campbell, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in Campbell live in densely developed areas, about 63 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Campbell sits in the top quarter (about 60%, above 97% of cities). A high never-married share predicts Democratic voting, and about 32% of adults in Campbell have never been married, above 82% of cities.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Campbell, CA sits in the top tenth nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in Campbell looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Campbell is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 70%, about 10 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Monte Sereno, CA D+34
- Saratoga, CA D+29
- Los Gatos, CA D+32
- Cupertino, CA D+31
- San Jose, CA D+31
- Santa Clara, CA D+35
- Sunnyvale, CA D+36
- Alum Rock, CA D+29
- Los Altos, CA D+40
- Alviso, CA D+24
Cities with Similar Populations
- Rockwall, TX R+31
- Bluffton, SC R+16
- Kendale Lakes, FL R+39
- Davis, CA D+66
- Spring Valley, NY Even
- Middleburg, FL R+46
- Lombard, IL D+14
- Spanaway, WA R+3
- Princeton, NJ D+53
- Sevierville, TN R+58
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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.