Mountain House leans slightly Democratic by roughly 12 points: about 56% of voters vote Democratic and 44% Republican.
About 53% of adults in Mountain House typically vote, below the U.S. average of about 62%. Among adults in Mountain House, ~30% vote Democratic, ~23% Republican, and ~47% don't vote. The map below shows estimated turnout by block group.
How Mountain House compares
Among cities within 25 miles, Mountain House leans more Democratic than 21 of 32 neighbors.
Mountain House runs about 8 points more Republican than California as a whole.
Why Mountain House 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 Mountain House, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 89% of residents in Mountain House live in densely developed areas, about 52 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Mountain House sits in the top quarter (about 55%, above 95% of cities).
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Mountain House, CA sits in the top quarter 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 Mountain House looks the way it does
Crowded housing lines up with lower turnout. About 10% of homes in Mountain House have more than one occupant per room, above 96% of cities. Strong routine healthcare access lines up with higher turnout, and Mountain House sits in the top quarter on routine-care measures. Renters vote less often than owners, and about 32% of households in Mountain House rent, above 87% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Tracy, CA D+4
- Byron, CA R+27
- Banta, CA R+12
- Holt, CA R+19
- Discovery Bay, CA R+12
- Livermore, CA D+21
- Lathrop, CA D+3
- Knightsen, CA R+21
- Brentwood, CA D+7
Cities with Similar Populations
- Zion, IL D+38
- Rolling Meadows, IL D+14
- Solon, OH D+26
- Avon Park, FL R+22
- Bardstown, KY R+37
- Camp Lejeune, NC R+3
- Barnegat, NJ R+27
- Crawfordville, FL R+47
- Roselle, IL Even
- Bronxville, NY D+26
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.