Alamo leans Democratic by roughly 20 points: about 60% of voters vote Democratic and 40% Republican.
About 83% of adults in Alamo typically vote, above the U.S. average of about 62%. Among adults in Alamo, ~50% vote Democratic, ~33% Republican, and ~17% don't vote. The map below shows estimated turnout by block group.
How Alamo compares
Among cities within 25 miles, Alamo leans more Democratic than 12 of 64 neighbors.
Politically, Alamo sits close to the rest of California.
Politics vary noticeably by neighborhood within Alamo. The north side is the most Democratic-leaning (D+36) and the east side is the least Democratic-leaning (D+13), a spread of about 23 points.
Why Alamo 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 Alamo, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 77% of adults in Alamo hold a bachelor's degree, about 49 points above the U.S. average of 28%. Dense areas vote Democratic, and Alamo sits in the top fifth on density (about 66%, above 91% of cities).
Population density and Democratic lean
Places with high population density tend to lean Democratic; Alamo, CA sits in the top quarter nationally on this measure.
Why turnout in Alamo looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Alamo 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 78%, about 18 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 93% of households in Alamo own their home, about 18 points above the U.S. average of 75%. High high-school completion lines up with higher turnout, and about 98% of adults in Alamo have completed high school, above 96% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Castle Hill, CA D+41
- Diablo, CA D+15
- Walnut Creek, CA D+47
- Danville, CA D+27
- Lafayette, CA D+48
- Moraga, CA D+49
- Clayton, CA D+14
- Pleasant Hill, CA D+41
- Concord, CA D+33
- Reliez Valley, CA D+34
Cities with Similar Populations
- Moore, SC R+21
- Tiverton, RI Even
- Belle Chasse, LA R+42
- Hillsboro, MO R+52
- Beech Grove, IN R+7
- Dexter, MI D+19
- Parlier, CA D+14
- Trenton, OH R+52
- Pittston, PA R+13
- Alachua, FL R+13
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.